AP physics review

AP physics review

Multiple Choice

A spring whose spring constant is 150 N/m exerts a force of 30 N on a block in a spring-block system. How far is the block from equilibrium?

• 0.2 m

• 0.5 m

• 1.0 m

• 1.5 m

• 2.0 m

Multiple Choice

A spring with k = 20 N/m is stretched 0.2 m from equilibrium; what is the magnitude of the force exerted by the spring?

• 0.1 N

• 0.4 N

• 0.8 N

• 4.0 N

• 8.0 N

Multiple Choice

A 5 kg object slides 100 m down a frictionless inclined plane dropping 45 m. It then slides along a horizontal surface with a coefficient of kinetic friction of 0.75 until it stops. How long does it take to stop after it leaves the inclined plane?

• 3 s

• 4 s

• 6 s

• 12 s

• 15 s

Multiple Choice

A 4.0 N force is used to accelerate a 2.0 kilogram block from rest to a velocity of 6.0 m/s. If the force was applied over a distance of 15 meters, the coefficient of kinetic friction between the block and the surface is most nearly

• 0.03

• 0.04

• 0.06

• 0.08

• 0.12

Multiple Choice

A block of mass m is placed on the frictionless inclined plane with an incline angle θ. The block is just in a contact with a free end on an unstretched spring with a spring constant k. If the block is released from rest, what is the maximum compression in the spring?

• kmg sinθ

• kmg cosθ

• 2mg sinθ /k

• mg/k

• kmg

Multiple Choice

An object with a mass of 2 kg is initially at rest at a position x = 0. A non-constant force F is applied to the object over 6 meters. What is the velocity of the object at 6 meters?

• 150 m/s

• 25 m/s

• 300 m/s

• 12.25 m/s

• more information is required

Multiple Choice

Two projectiles A and B are launched from the ground with velocities as follows (angles wrt horizontal):

Projectile A: 50 m/s at 60 ̊

Projectile B: 50 m/s at 30 ̊

Assuming there is no air resistance involved, which projectile has greater kinetic energy when it reaches the highest point?

• projectile A

• projectile B

• they both have the same non-zero kinetic energy

• they both have zero kinetic energy at the highest point

• more information is required

Multiple Choice

A student pushes a box across a horizontal surface at a constant speed of 0.6 m/s. The box has a mass of 40 kg, and the coefficient of kinetic friction is 0.5. The power supplied to the box by the person is

• 40 W

• 60 W

• 150 W

• 120 W

• 200 W

Multiple Choice

A driver in a 2000 kg Porsche wishes to pass a slow moving school bus on a 4 lane road. What is the average power in watts required to accelerate the sports car from 30 m/s to 60 m/s in 9 seconds?

• 1,800

• 5,000

• 10,000

• 100,000

• 300,000

Multiple Choice

A stone is dropped from the edge of a cliff. Which of the following graphs best represents the stone's kinetic energy KE as a function of time t?

Multiple Choice

A force of 20 N compresses an ideal spring with a spring constant 50 N/m. How much energy is stored in the spring?

• 2 J

• 5 J

• 4 J

• 6 J

• 8 J

Multiple Choice

A solid sphere and a solid disk both have the same R and M. They are both rolling with a Vcom = 3 m/s. Which one has more rotational kinetic energy?

• Its the same!

• Solid Sphere has more Krot

• Solid Disk has more Krot

• I need to know specifically what M and R is to figure this one out!!

Multiple Choice

A 5.0 kg car moves to the right at 4 m/s. It experiences a net force of 10 N to the right for 3.0 seconds. The impulse is...

• 20 kg*m/s

• 50 kg* m/s

• 30 N*s

• -10 N*s

Multiple Choice

In a rolling race down a ramp, which object will reach the bottom first? There is plenty of friction and they are released at the same time.

• Hollow Disk

• Solid Sphere

• Solid Disk

• It depends on the radius and mass.

Multiple Choice

When a spinning figure skater (no external torques acting) brings her arms in toward her body, the angular momentum...

• Stays the same

• Increases

• Decreases

• Depends on if kinetic energy is conserved.

Multiple Choice

A collision occurs on a level, friction surface with NO external forces. What is true about the V com ?

• It is usually less after the collision than before.

• It depends if there is any Q.

• The acceleration of the com is zero thank you very much.

• It depends if it is sticky or bouncy.

Multiple Choice

The speed of sound in water is about 1,482 m/s. If the frequency of the wave is 20 Hz, then what is the wavelength?

• 148.2 meters

• 74.1 meters

• 102.1 meters

• 98.6 meters

Multiple Choice

A stationary horn broadcasts an emergency distress signal at a constant frequency f. A stationary observer hears the signal then begins to walk away from the source. The observer will perceive a frequency that is:

• constantly the same as f.

• Initially the same as f, with the frequency decreasing.

• always greater than f.

• Initially the same as f, with the frequency increasing.

Multiple Choice

A train moving at 20 m/s sounds it's whistle while passing a stationary observer. The apparent frequency of the observer can be seen on the graph. If the speed of sound for that day is 338 m/s, then what is the frequency of the whistle?

• 555 Hz

• 625 Hz

• 358 Hz

• 478 Hz

Multiple Select

Which of the following (select two) do not change when a sound wave moves from one medium to another:

• Velocity

• Frequency

• Period

• Wavelength

Multiple Choice

A guitar string−fixed at both ends−has a frequency of 247 Hz. If the velocity of the wave is 296.4 m/s, then what is the length of the guitar string?

• 0.6 meters

• 1.2 meters

• 1.8 meters

• 0.3 meters

Multiple Choice

The length of a pipe organ is 2.4 meters. If the pipe is opened at both ends and the speed of sound in air is 343 m/s, then what is the fundamental frequency of the sound wave?

• 214.5 Hz

• 823.2 Hz

• 143 Hz

• 71.5 Hz

Multiple Choice

Which of the following is true about the speed of sound through different mediums?

• V(gas) > V(liquid) > V(solid)

• V(liquid) > V(gas) > V(solid)

• V(solid) > V(liquid) > V(gas)

• V(solid) > V(gas) > V(liquid)

Multiple Choice

A water wave has a period of 0.25 seconds and a wavelength of 0.6 meters. What is the speed of the wave?

• 2.4 meters

• 0.15 meters

• 0.85 meters

• 2.1 meters

Multiple Choice

Two waves of amplitude A travel to the right that is fixed on the left but not on the right. When the two waves meet, the resultant wave will have amplitude:

• 0

• 2A

• A

• A²

Multiple Choice

Two waves of amplitude A are initially traveling in the same direction through a rope that is fixed at both ends. When the two waves meet, the resultant wave will have an amplitude of:

• A

• A²

• 2A

• 0

Multiple Choice

An object with an initial velocity of 3.50 m/s moves east along a straight and level path. The object then undergoes a constant acceleration of 1.80 m/s² east for a period of 5.00 s. How far does the object move while it is accelerating?

• 6.30 m
• 17.5 m
• 27.2 m
• 40.0 m

Multiple Choice

If a car is traveling forward at 15 m/s, how fast will it be going in 1.2 seconds if the acceleration is -10 m/s²?

• 27 m/s
• 3 m/s
• -27 m/s
• -3 m/s

Multiple Choice

A ball is thrown downward from the top of a roof with a speed of 25 m/s. After 2 s, its velocity will be:

• 19.6 m/s

• -5.4 m/s

• -44.6 m/s

• 44.6 m/s

Multiple Choice

A car is traveling at 21.0 m/s. It slows to a stop at a constant rate over 5.00 s. How far does the car travel during those 5.00 seconds before it stops? 

• 4.20 m
• 52.5 m
• 105 m
• 158 m

Multiple Choice

A car starts from rest and after 7 seconds it is moving at 42 m/s. What is the car’s average acceleration?

• 0.17 m/s²

• 1.67 m/s²

• 6 m/s²

• 7 m/s²

Multiple Choice

A car starts from rest and after 7 seconds it is moving at 42 m/s. What is the car’s average acceleration?

• 0.17 m/s²

• 1.67 m/s²

• 6 m/s²

• 7 m/s²

Multiple Choice

A roller coaster car of mass m has a speed of 0 m/s just before it starts to go down a hill as show above. Assume the roller coaster does not encounter any friction or air resistance. What is the speed of the roller coast car at point B?

• $\sqrt{gh}$

• $\sqrt{2gh}$

• $\sqrt{\frac{gh}{2}}$

• $\sqrt{\frac{2gh}{m}}$

Multiple Choice

In which of the following situations is kinetic energy decreasing?

• A lit tinsel llama is dropped from a building.

• A satellite is moving in a circular orbit around the moon.

• A baseball is headed upward after being thrown up in the air.

• An elevator is moving upward at a constant velocity.

Multiple Choice

A spring is compressed by a force F against a wall as shown. Which of the following describes the sign of work done by the spring as it is being compressed?

• The spring does positive work since it is gaining potential energy.

• The spring does zero work since all the work is done by force F.

• The spring does negative work since it applies a force against the direction of its compressing motion.

• The spring works part-time at Chik Fil-A.

Multiple Choice

A baguette is dropped off the top of the Eiffel Tower. What is true concerning of the mechanical energy of the ball as it falls?

• The potential energy of the baguette is conserved as it falls.

• The sum of the kinetic and potential energies of the baguette is a constant.

• The kinetic energy of the baguette is conserved as it falls.

• A) The total energy of the object increases as it falls since it gains speed.

Multiple Choice

A golf ball accelerates off a tee at 8 800 m/s², changing its velocity from 0m/s to 44 m/s down the fairway. How long did it take the golf ball to accelerate?

• 0.22 seconds
• 200 seconds
• 14 seconds
• 0.0050 seconds

Multiple Choice

An object with an initial velocity of 3.50 m/s moves east along a straight and level path. The object then undergoes a constant acceleration of 1.80 m/s² east for a period of 5.00 s. How far does the object move while it is accelerating?

• 6.30 m
• 17.5 m
• 27.2 m
• 40.0 m

Multiple Choice

If a car is traveling forward at 15 m/s, how fast will it be going in 1.2 seconds if the acceleration is -10 m/s²?

• 27 m/s
• 3 m/s
• -27 m/s
• -3 m/s

Multiple Choice

How much time would it take for an object to fall 4.7 meters?

• 0.959 s
• 4.79 s
• 0.979 s

Multiple Choice

A roller coasters accelerates from an initial velocity of 6.0 m/s to a final velocity of 70 m/s over 4 seconds.  What's the acceleration?

• 24 m/s²
• 18 m/s²
• 16 m/s²
• 16 m/s

Multiple Choice

A ball is thrown downward from the top of a roof with a speed of 25 m/s. After 2 s, its velocity will be:

• 19.6 m/s

• -5.4 m/s

• -44.6 m/s

• 44.6 m/s

Multiple Choice

A car is traveling at 21.0 m/s. It slows to a stop at a constant rate over 5.00 s. How far does the car travel during those 5.00 seconds before it stops? 

• 4.20 m
• 52.5 m
• 105 m
• 158 m

Multiple Choice

A dog runs with an initial speed of 7.5 m/s to a stop in 15 seconds.  What is the dog's acceleration?

• -7.5 m/s
• -7.5 m/s²
• -0.5 m/s²
• 7.5 mi//hr

Multiple Choice

A car starts from rest and after 7 seconds it is moving at 42 m/s. What is the car’s average acceleration?

• 0.17 m/s²

• 1.67 m/s²

• 6 m/s²

• 7 m/s²

Multiple Choice

A train travels 6 meters in the first second of travel, 6 meters again during the second second of travel, 6 meters again during the third second. What's the train's acceleration ?

• 0 m/s²

• 6 m/s²

• 12 m/s²

• 18 m/s²