AP Physics Question Preview (ID: 41437)


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When a current flows through a metal wire, the moving charges are
a) Only Protons
b) Only Electrons
c) Both Protons and Electrons
d) Nuetrons

A spinning ice skater on extremely smooth ice is able to control the rate at which she rotates by pulling in her arms. Which of the following statements are true about the skater during this process?
a) Her angular momentum remains constant.
b) Her moment of inertia remains constant
c) Her kinetic energy remains constant.
d) She is subject to a constant non-zero torque.

Suppose a solid uniform sphere of mass M and radius R rolls without slipping down an inclined plane starting from rest. The angular velocity of the sphere at the bottom of the incline depends on
a) the mass of the sphere.
b) both the mass and the radius of the sphere.
c) the radius of the sphere.
d) neither the mass nor the radius of the sphere.

A firecracker explodes in midair and breaks up into many fragments. Which of the following statements are true regarding conditions immediately before and immediately after the explosion: I. The total momentum of the fragments is equal to the origi
a) Statement I only
b) Statement II only
c) Both Statement I and Statement II
d)

Two objects of different masses have momentum of equal, non-zero magnitude. Which object has more kinetic energy?
a) the heavier object
b) the lighter object
c) They both have the same kinetic energy.
d)

A railroad car collides with and sticks to an identical railroad car that is initially at rest. After the collision, the kinetic energy of the system
a) is the same as before.
b) is half as much as before.
c) is one third as much as before.
d) is one quarter as much as before

In a game of pool, the white cue ball hits the #5 ball and stops, while the #5 ball moves away with the same velocity as the cue ball had originally. Both balls have the same mass. This type of collision is
a) somewhat inelastic
b) completely inelastic.
c) elastic.
d)

Which of the following quantities has units of a velocity?
a) 40 km southwest
b) 9.8 m/s2 downward
c) 186,000 mi
d) -120 m/s

When is the average velocity of an object equal to the instantaneous velocity?
a) when the velocity is constant
b) always
c) never
d) Only when slowing down

If the velocity of an object is zero at some point, then its acceleration must also be zero at that point
a) True
b) False
c) Hmm...
d)

An object moving in the +x direction experiences an acceleration of +2.0 m/s2. This means the object
a) travels 2.0 m in every second.
b) is traveling at 2.0 m/s
c) is decreasing its velocity by 2.0 m/s every second.
d) is increasing its velocity by 2.0 m/s every second.

When a ball is thrown straight up with no air resistance, the acceleration at its highest point
a) Upwards
b) Downwards
c) Zero
d) reverses from upward to downward

For general projectile motion with no air resistance, the horizontal component of a projectile's velocity
a) remains zero.
b) remains a non-zero constant.
c) continuously increases.
d) continuously decreases.

If a satellite moves with constant speed in a perfectly circular orbit around the earth, what is the direction of the acceleration of the satellite?
a) in the forward direction
b) in the backward direction
c) outward away from the earth
d) inward toward the earth

A boy jumps with a velocity of magnitude 20.0 m/s at an angle of 25.0° above the horizontal. What is the horizontal component of the boy's velocity?
a) 15.6 m/s
b) 8.45 m/s
c) 9.33 m/s
d) 18.1 m/s

In a collision between a huge SUV and a small hybrid car, the SUV exerts a larger force on the hybrid than the hybrid exerts on the SUV
a) True
b) False
c) It depends on whether the collision is a head-on collision or a rear-end collision
d)

An object is moving with constant non-zero velocity. Which of the following statements about it must be true?
a) A constant force is being applied to it in the direction of motion.
b) A constant force is being applied to it in the direction opposite of motion
c) A constant force is being applied to it perpendicular to the direction of motion.
d) The net force on the object is zero.

What is the mass of an object that experiences a gravitational force of 685 N near Earth's surface where g = 9.80 m/s2?
a) 69.9 kg
b) 71.3 kg
c) 68.5 kg
d) 72.7 kg

An object that weighs 75 N is pulled on a horizontal surface by a horizontal pull of 50 N to the right. The friction force on this object is 30 N to the left. What is the acceleration of the object?
a) 0.27 m/s2
b) 1.1 m/s2
c) 2.6 m/s2
d) 11 m/s2

When you have two negative charges, you would expect them to...
a) Move towards each other
b) Repel
c) Fall flat
d)

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