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9th Grade Physics- Intro to Physics Practice Exam 1



Multiple Choice
Identify the choice that best completes the statement or answers the question.
 

 1. 

Rare Earth magnets, ceramic magnets, and the type of magnet on your refrigerator are all
a.
electromagnets
c.
temporary magnets
b.
permanent magnets
 

 2. 

Use Ohm’s Law to calculate the current of a circuit that includes a 2 ohm resistor and a 24 volt power supply.
a.
22 Amps
c.
48 Amps
b.
12 Amps
d.
1/12 Amp
 

 3. 

Heat transferred from one atom to the next through direct contact is called
a.
convection
c.
conduction
b.
radiation
 

 4. 

Kilometers per hour (km/hour ) represents
a.
average speed
c.
constant speed
b.
average velocity
d.
constant velocity
 

 5. 

A positive charge and a negative charge will
a.
repel
c.
remain unchanged
b.
create a neutral charge
d.
attract
 

 6. 

mc006-1.jpg

Find the acceleration of the object above.
a.
24 m/s/s
c.
96 m/s/s
b.
6 m/s/s
d.
1/6 m/s/s
 

 7. 

Which type of charge will a balloon have after rubbing it in a student’s hair?
a.
negative
c.
neutral
b.
positive
 

 8. 

A student pushes a cart down a road with a force of 10 Newton’s, and in doing so does 500 joules of work.  How far did the student push the box?
a.
5,000 meters
c.
0.02 meters
b.
510 meters
d.
50 meters
 

 9. 

Use Ohm’s Law to calculate the resistance of a circuit that includes a 4 amps and a 24 volt power supply.
a.
96 Ohms
c.
6 Ohms
b.
20 Ohms
d.
1/6 Ohms
 

 10. 

mc010-1.jpg
A pendulum will stop swinging when
a.
the pressure is greater than the force of the pendulum
c.
the friction of air particles is greater than the force of the pedulum moving
b.
the inertia is greater than the force of the pendulum
d.
the gravitational pull is greater than the force of the moving pendulum
 

 11. 

The Law of Conservation of Energy states
a.
energy can be created or destroyed
c.
energy cannot be created or destroyed
b.
energy cannot be created but can be destroyed
d.
energy can be created but not destroyed
 

 12. 

The product of the mass and velocity
a.
inertia
c.
momentum
b.
friction
d.
force
 

 13. 

mc013-1.jpg
The graph above shows the distance traveled by a mouse in a straight line.  If the mouse keeps moving at the same speed in a straight line, how far will the mouse travel in 30 seconds
a.
10.0 cm
c.
8 cm
b.
11.0 cm
d.
12.0 cm
 

 14. 

A man has parked his car after driving 60 miles.  He slides under the car to change the oil, as he reaches up to unscrew the oil plug his hand touches the engine and burns his hand.  This is an example of which type of heat transfer?
a.
convection
c.
conduction
b.
radiation
d.
insulation
 

 15. 


Car
Mass (kg)
Force (N)
A
2
20
B
4
20
C
6
20
D
8
20
Analyze the table above to determine the car with the MOST amount of acceleration.
a.
A
c.
C
b.
B
d.
D
 

 16. 

Friction maybe defined as the
a.
resisting the motion of solid surfaces, fluid layers, and/or objects sliding against each other.
c.
the tendency of a force to rotate an object about an axis.
b.
the resistance of any object to a change in its state of motion or rest.
d.
influence that causes an object to  change in speed, change in direction, or change in shape.
 

 17. 

A runner sprints 10 meters in 2 seconds, assuming the sprinter started from a stand still what is his acceleration at 10 meters?
a.
2.5 m/s2
c.
20 m/s2
b.
5 m/s2
d.
10 m/s2
 

 18. 

A neutrally charged object will become positive if
a.
protons are removed from the object
c.
electrons are removed from the object
b.
an equal amount of electrons and protons are added
d.
electrons are added to the object
 

 19. 

A three year old child rolls a bowling ball down a bowling lane, but the ball comes to a stop before it reaches the bowling pins.  The energy was
a.
transferred into heat due to the friction of the surface and the ball
c.
created when the child released the bowling ball
b.
destroyed once the bowling ball stopped
d.
destroyed by the gravitational pull of the Earth
 

 20. 

A force that opposes motion between two surfaces that are in contact
a.
inertia
c.
friction
b.
momentum
d.
force
 

 21. 

mc021-1.jpg
The electromagnetic wave with the shortest wavelength
a.
radio waves
c.
ultraviolet
b.
microwaves
d.
gamma rays
 

 22. 

An athlete can run 20 kilometers in 2 hours.  If the athlete runs at that same average speed for 1 hour, how far will the athlete run.
a.
20 km
c.
5 km
b.
10 km
d.
40 km
 

 23. 

A student pushes her friend on a skateboard with a force of 40 Newton’s for about 50 meters, Calculate the amount of work.
a.
10 joules
c.
2000 joules
b.
1.25 joules
d.
0.8 joules
 

 24. 

mc024-1.jpg
The diagram above represents which type of wave?
a.
longitudinal
c.
expansion
b.
transverse
d.
compression
 

 25. 

A negative charge and a negative charge will
a.
repel
c.
create a neutral charge
b.
remain unchanged
d.
attract
 

 26. 

A rubber ball is dropped from rest from a height of 10 meters above the ground.  The rubber ball free falls and reaches the ground 2 seconds later.  What was the average speed of the rubber ball?
a.
10 m/s
c.
5 m/s
b.
0.2 m/s
d.
20 m/s
 

 27. 

mc027-1.jpg

Find the force applied to the object above.
a.
2/3 N
c.
24 N
b.
1.5 N
d.
4 N
 

 28. 

mc028-1.jpg
One force pulls from the left at 10 N, and one force pulls in the opposite direction at 5 N.  What is the net force and in which direction?
a.
Right, 5 N
c.
Left, 15 N
b.
Left, 5 N
d.
Right, 15 N
 

 29. 

mc029-1.jpg
A pizza delivery driver applied a constant force to a car.  A graph of the car’s movement is shown above.  Which of the following can best explain the change in velocity at time X?
a.
The car began traveling up a hill
c.
The car began to drive on a curved road
b.
The car changed from a rough road to a smooth road with less friction
d.
The car’s momentum became greater than its inertia
 

 30. 

Given: distance = 20 meters, time = 2 seconds.  Find average speed.
a.
2 m/s
c.
0.1 m/s
b.
10 m/s
d.
40 m/s
 

 31. 

A student helps his mother bring groceries into the house from the car, if the student does 500 joules of work in 4 seconds, how much power did the student use?
a.
2000 watts
c.
0.008 watts
b.
125 watts
d.
504 watts
 

 32. 

If your clothes have a greater  amount of protons than electrons your clothes are considered
a.
positive
c.
negative
b.
neutral
 

 33. 

Which color of the visible light spectrum has the  longest wavelength?
a.
red
d.
green
b.
orange
e.
blue
c.
yellow
f.
violet
 

 34. 

mc034-1.jpg
Use the graph above to find the deceleration of an object.
a.
10.33 m/s2
c.
6.67 m/s2
b.
8.33 m/s2
d.
12.67 m/s2
 

 35. 

mc035-1.jpg
The current is least at which point in the circuit?
a.
A
c.
C
b.
B
 

 36. 

Which of the following examples defies the Law of Conservation of Energy?
a.
A ball rolling on a flat surface and then coming to a stop
c.
A ball bounces, each bounces is rebounds with less height than the previous
b.
A ball increases speed as it rolls down hill, but eventually comes to a stop
d.
A ball rolls down and up a “U” shaped valley never stopping because of the force of gravity when it goes down hill
 

 37. 

mc037-1.jpg

Four different students, student A, B,C, and D, pull from four different directions.  Which student will end up pulling the blue square in their direction?
a.
Student A
c.
Student C
b.
Student B
d.
Student D
 

 38. 

A train slows down from 10 m/s to 4 m/s in 2 seconds, find the deceleration.
a.
-4 m/s2
c.
-3 m/s2
b.
-2 m/s2
d.
-5 m/s2
 

 39. 

A sprinter finished his 100 meter race in 10 seconds, find his average speed for the race.
a.
10 m/s
c.
1000 m/s
b.
100 m/s
d.
0.10 m/s
 

 40. 

Which values are necessary to find velocity?
a.
elapsed time, distance, and direction
c.
initial time, ending time, distance
b.
elapsed time and distance
d.
initial time, direction, and distance
 

 41. 

Given: distance = 100 meters, average speed = 20 m/s.  Find time.
a.
100 seconds
c.
20 seconds
b.
5 seconds
d.
200 seconds
 

 42. 

When two forces act in the same direction the net force is
a.
the sum of the forces
c.
multiplied by the two forces
b.
the difference of the two forces
d.
divided by the two forces
 

 43. 

The result of distance divided by time (d/t = ?)  is
a.
variable speed
c.
average speed
b.
constant speed
d.
average velocity
 

 44. 

mc044-1.jpg

Find the force applied to the object above.
a.
1/10 N
c.
40 N
b.
20 N
d.
10 N
 

 45. 

Submarines bounce sound waves off the bottom of the ocean to navigate and search for enemy submarines.  This system is called
a.
Doppler
c.
sonar
b.
radar
d.
acoustic finder
 

 46. 

mc046-1.jpg
The diagram above is an example of which type of circuit?
a.
parallel
c.
series and parallel
b.
series
 

 47. 

Acceleration can be describe as a
a.
change in direction
c.
change in speed
b.
change in velocity and time
 

 48. 

mc048-1.jpg
Which distance-time graph above shows that an object moved at a constant speed and then stopped moving?
a.
A
c.
C
b.
B
d.
D
 

 49. 

mc049-1.jpg
The particles in this type of wave will vibrate
a.
horizontal and vertical
c.
in a circular manner
b.
vertical, perpendicular to the direction of the wave
d.
horizontal to the direction of the wave
 

 50. 

Which of the following examples represents the least amount of potential energy?
a.
A basketball stuck on the rim
c.
A flyball falling down to an outfielder’s glove
b.
An apple on a tree branch
d.
A rollercoaster at the top of the tracks
 

 51. 

A baseball pitcher throws a fastball that moves from 0 mph to 80 mph in 2 seconds, find the acceleration.
a.
50 mph/s
c.
60 mph/s
b.
40 mph/s
d.
70 mph/s
 

 52. 

Which of the following represents the velocity of a moving car?
a.
50 m/s
c.
50
b.
50 m/s, in a southern direction
d.
50 m, in a southern direction
 

 53. 

A truck travels 90 km/hr in a northwest direction, the variables will describe the truck’s
a.
average velocity
c.
deceleration
b.
average speed
d.
acceleration
 

 54. 

mc054-1.jpg
An object exerts 25 Newton’s onto the surface of a table, how much Force is exerted upward by the table?
a.
0 N
c.
25 N
b.
20 N
d.
Not enough information
 

 55. 

The bubbles you see in a boiling pot of water are an example of which type of heat transfer?
a.
convection
c.
radiation
b.
conduction
 

 56. 

mc056-1.jpg

Identify the point at which the greatest amount of potential energy exists.
a.
A
c.
C
b.
B
d.
D
 

 57. 

mc057-1.jpg

Find the mass of the object above.
a.
50 kg
c.
2 kg
b.
1/2 kg
d.
10 kg
 

 58. 

A car accelerates from 0 to 25 miles per hour in 10 seconds.  What is the rate of acceleration?
a.
1.0 miles/hour/second
c.
2.5 miles/hour/second
b.
250 miles/hour/second
d.
2.0 miles/hour/second
 

 59. 

The tendency of an object to resist being moved or change in speed
a.
friction
c.
momentum
b.
force
d.
inertia
 

 60. 

mc060-1.jpg
According to the Law of Conservation of Energy the steel bearings in Newton’s Cradle will experience all of the following EXCEPT
a.
Energy is being transformed in the form of heat as the bearings hit each other
c.
Energy is being created when the bearings are set in motion and destroyed when the bearings stop
b.
Energy is being transferred into the surrounding air molecules as the air friction slows the bearings down
d.
The impact of one bearing will cause one bearing to move in an opposite direction
 

 61. 

mc061-1.jpg
The graph above shows the movement of a ball at several points in time.  What is the average speed of the object?
a.
4 m/min
c.
0.5 m/min
b.
50 m/min
d.
2 m/min
 

 62. 

mc062-1.jpg
Use the graph above to find the bike’s acceleration.
a.
30 m/s/s
c.
10 m/s/s
b.
20 m/s/s
d.
40 m/s/s
 

 63. 

These type of waves requires no medium for which to vibrate
a.
sound and light
c.
none of the above
b.
light
d.
sound
 

 64. 

Which of the following is a measurement of acceleration?
a.
10 km/hr/sec
c.
10 km/hr
b.
10 km
d.
10 hr
 

 65. 

mc065-1.jpg

Find the acceleration of the object above.
a.
1/6 m/s/s
c.
12 m/s/s
b.
6 m/s/s
d.
24 m/s/s
 

 66. 

Use Ohm’s Law to calculate the volts of a circuit that includes a 3 amps and a 5 Ohm resistor.
a.
5/3 Ohms
c.
3/5 Ohms
b.
15 Ohms
d.
8 Ohms
 

 67. 

mc067-1.jpg
What happens to the polarity of a bar magnet when it is broken?
a.
The north piece flips polarity and the south remains the same
c.
The north piece remains the same and the south piece flips polarity
b.
The two new pieces retain the same polarity despite the two pieces
d.
The two pieces repel each other at the break
 

 68. 

Given: time = 30 seconds, 10 meters/second.  Find distance.
a.
10 meters
c.
300 meters
b.
30 meters
d.
0.3 meters
 

 69. 

Copper is used in electric wires because it is a good
a.
conductor
b.
insulator
 

 70. 

Sound waves are produced by
a.
mechanical vibrations
c.
water movement
b.
heat radiation
d.
air movement
 

 71. 

When you hear a jet airplane flying towards you sound increases, as it travels away from you sound decreases.  This is called the
a.
Doppler effect
c.
Bernoulli effect
b.
Pascal effect
d.
Archimedes effect
 

 72. 

mc072-1.jpg
A 10kg, 20 kg, and a 30 kg ball fall in a vacuum tube from the same height, with no air resistance.  Which object(s) will fall the fastest?
a.
20 kg
c.
10 kg
b.
30 kg
d.
The 10 kg, 20 kg, and 30 kg will fall at the same rate
 

 73. 

Each year scouts compete in soap box derby races.  The races consist of a wooden car with four wheels.  The car rolls down hill with out the aide of anything but gravity.  The winners always have well lubricated axles and or bearings.  The lubrication helps prevent __________ which speeds the car up.
a.
torque
c.
momentum
b.
inertia
d.
friction
 

 74. 

A rocket takes 20 seconds to slow down from 800 km/hr to 400 km/hr.  What is the rocket’s deceleration?
a.
- 40 km/hr/sec
c.
- 20 km/hr/sec
b.
- 30 km/hr/sec
d.
- 50 km/hr/sec
 

 75. 

Which color of the visible light spectrum has the lowest frequency?
a.
red
d.
green
b.
orange
e.
blue
c.
yellow
f.
violet
 

 76. 

Batteries collect __________ on the negative terminal of the battery, and flow from negative to positive.
a.
electrons
c.
neutrons
b.
protons
 

 77. 


Car
Mass (kg)
Force (N)
A
10
10
B
10
20
C
10
30
D
10
40
Analyze the table above to determine the car with the LEAST amount of acceleration.
a.
A
c.
C
b.
B
d.
D
 

 78. 

Given: final velocity = 200 km/hr, initial velocity = 100 km/hr, and the time interval = 10 seconds.  Find acceleration.
a.
10 km/hr/sec
c.
40 km/hr/sec
b.
20 km/hr/sec
d.
30 km/hr/sec
 

 79. 

A scuba diver shines his upward toward the surface of the lake, as the light travels from water to air the speed
a.
decreases
c.
stays the same
b.
increases
 

 80. 

Electromagnetic waves move as
a.
particles and waves
c.
waves
b.
neither
d.
particles
 

 81. 

mc081-1.jpg

Find the force applied to the object above.
a.
2.5 N
c.
10 N
b.
2/5 N
d.
2 N
 

 82. 

In order to increase the amount of energy in a wave you have to
a.
increase amplitude and decrease wavelength
c.
decrease amplitude and increase wavelength
b.
decrease amplitude and decrease wavelength
d.
increase amplitude and increase wavelength
 

 83. 

Electromagnets are created by wrapping wire around a metal rod and then applying electricity to the wire.  The greater the voltage applied to the wire the
a.
the colder the wire gets
c.
weaker the electromagnet
b.
the hotter the wire gets and there is no change in the magnetic force
d.
stronger the electromagnet
 

 84. 

mc084-1.jpg
Determine the resulting force and direction for the diagram above.
a.
The object will stay in the same place with 10 N net force
c.
The object will move left with 10 N of force
b.
The object stays in the same place, 0 N net force
d.
The object will move right with 10 N of force
 

 85. 

mc085-1.jpg

Find the mass of the object above.
a.
1/4 kg
c.
4 kg
b.
8 kg
d.
16 kg
 



 
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