AP Physics Final

an object is moving with a 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 it was moving B) its acceleration is in the same direction as its velocity C) A constant force is being applied to it in the direction opposite of motion D) the net force of the object is zero

the net force of the object is zero

an object's velocity (v) as a function of time (t) is given above, which statement is true about the motion of the object?

the object's initial and final positions are the same

Two objects have masses m and 5m, respectively. They both are placed side by side on a frictionless inclined ramp and allowed to slide down from rest without any air resistance. Which one of the following statements about these objects is correct? A) it takes the lighter object 5 times longer to reach the bottom of the ramp than the heavier one B) It takes the heavier object 5 times longer to reach the bottom of the ramp than the lighter one C) It takes the heavier object 10 times longer to reach the bottom than the lighter one D) the two objects reach the bottom of the ramp at exactly the same time E) it takes the lighter object 10 times longer to reach the bottom of the ramp than the heavier one

the two objects reach the bottom of the ramp at exactly the same time

A push of magnitude P acts on a box of weight W as shown in the figure. The push is directed at an angle θ below the horizontal, and the box remains a rest. The box rests on a horizontal surface that has some friction with the box. The normal force on the box due to the floor is equal to

w+p sin(theta)

For general projectile motion with no air resistance, the horizontal component of a projectile's acceleration A) First decreases and then increases B) continuously decreases C) Is always zero D) Remains a non-zero constant E) continuously increases

is always zero

A spaceship is traveling to the Moon. At what point is it beyond the pull of Earth's gravity? A) When it is halfway there B) When it is closer to the moon than it is to Earth C) When it gets above the atmosphere D) It is never beyond the pull of Earth's gravity

it is never beyond the pull of Earth's gravity

Two boxes P and Q on a perfectly smooth horizontal surface are connected by a light horizontal cord. The mass of P is greater than that of Q. A horizontal force F is applied to box Q as shown in the figure, accelerating the bodies to the right. The magnitude of the force exerted by the connecting cord on body P is A) equal to F B) Greater than F C) Less than F but not zero D) Zero

less than f but not zero

a small car is rolling freely on an inclined ramp with a constant acceleration of 0.5 m/s^2 in the -x direction. At time t=0, the cart has a velocity of 2.0 m/s in the +x direction. If the cart never leaves the ramp, which of the following statements correctly describes the motion of the cart at t>5s? A) the cart is traveling in the +x direction and is slowing down B) the cart is traveling in the +x direction and is speeding up C) The cart is traveling in the -x direction and is slowing down D) the cart is traveling in the -x direction and is speeding up

the cart is traveling in the -x direction and is speeding up

If you pound a feather with a hammer, which one feels a greater force? A) always the feather B) if the feather moves, then ti felt the greater force. Otherwise the force was the same on both. C) the size of the force is always exactly the same on both of them

the size of the force is exactly the same on both of them

The motion of a car and a truck along a straight road are represented by the velocity vs. time graph in the figure. The two are initially along side each other at t=0. At time T, what is true of the distances traveled by the vehicles since time t=0? A) the truck will have traveled further than the car B) they will have traveled the same distance C) the truck will not have moved D) the car will have traveled further than the truck

the truck will have traveled further than the car

A person who normally weighs 700 N is riding in a rather swift elevator that is moving at a constant speed of 9.8 m/s. If this person is standing on a bathroom scale inside the elevator, what would the scale read? A) less than 700 N B) 700 N C) More than 700 N D) It could be less or more than 700 N but it depends on if it is going up or down

700 N

An object is moving with a constant non-zero acceleration in the (+x direction). The position vs. time graph of the object is A) a horizontal straight line B) a vertical straight line C) a straight line making an angle with the time axis D) A parabolic curve

A parabolic curve

Mary and Debra stand on a snow-covered roof. They both throw snowballs with the same initial speed, but in different directions. Mary throws her snowball downward, at 30° below the horizontal; Debra throws her snowball upward, at 30° above the horizontal. Which of the following statements are true about just as the snowballs reach the ground below? (There could be more than one correct choice.) A) Both snowballs will take the same amount of time to hit the ground B) Mary's snowball will stay in the air longer than Debra's snowball C) Mary's snowball has a greater downward acceleration than Debra's snowball D) Debra's snowball will stay in the air longer than Mary's snowball

Debra's snowball will stay in the air longer than Mary's snowball

A satellite is in orbit around the earth. Which one feels the greater force? A) Earth and the satellite feel exactly the same force B) It depends on the distance of the satellite from Earth C) The satellite because the earth is so much more massive D) The Earth because the satellite has so little mass

Earth and the satellite feel exactly the same force

a bucket is being lowered by a very light rope with a constant downward velocity. The tension in the rope must be A) less than the weighty of the bucket B) Equal to the weight of the bucket C) Greater than the weight of the bucket

Equal to the weight of the bucket

Suppose a ball is thrown straight up and experiences no appreciable air resistance. What is its acceleration just before it reaches its highest point? A) Exactly g B) zero C) slightly greater than g D) slightly less than g

Exactly g

two small bowls A and B, attract each other gravitationally with a force of magnitude F. If we now double both masses and the separation of the balls, what will now be the magnitude of the attractive force on each one A) F B) 16F C) 8F D) F/4 E) 4F

F

If you swing a bucket of water fast enough in a vertical circle, at the highest point the water does not spill out. This happens because an outward force balances the pull of gravity on the water. A) True B) False

False

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) inwards toward the earth B) Outwards away from the earth C) The acceleration is zero because the speed is constant D) in the forward direction E) in the backward direction

Inwards toward the earth

Suppose that a car is traveling to the west (-x direction) begins to slow down as it approaches a traffic light. Which statement concerning its acceleration must be correct? A) its acceleration is decreasing in magnitude as the car slows down B) Its acceleration is zero C) Its acceleration is positive D) its acceleration is negative

Its acceleration is positive

You are making a circular turn in your car on a level road when you hit a patch of ice, causing the force of friction between the tires and the road its on to become zero. While the car is on ice it: A) continue to follow a circular path, but with a radius larger than the original circle B) Moves in a straight line path outwards from the center of the circle C) Moves along a straight line path towards the center of the circle D) Moves along a straight line path in a direction tangent to the curvature of the turn E) moves along a path that is neither straight or circular

Moves along a straight line path in a direction tangent to the curvature of the turn

A person is running on a track. Which of the following forces propels the runner forward A) the normal force exerted by the ground on the person B) the normal force exerted by the person on the ground C) the force of friction exerted by the ground on the person D) The force of friction exerted by the person on the ground

The force of friction exerted by the ground on the person

Two blocks, A and B, are being pulled to the right along a horizontal surface by a horizontal 100-N pull, as shown in the figure. Both of them are moving together at a constant velocity of 2.0 m/s to the right, and both weigh the same. Which of the figures below shows a correct free-body diagram of the horizontal forces acting on the lower block, B? A) [A] (no horizontal forces act on A) B) [A]---->50 N C) [A] -----> 100 N D) 100 N <----[A]----> 100 N

[A] (no horizontal forces acts on A)

a player kicks a soccer ball in a high arc toward the goal. At the highest point in its trajectory:

Neither the ball's velocity nor its acceleration are zero

A car goes around a circular curve on a level road at a constant speed. What is the direction of the friction force on the car due to the road? A) Perpendicular to the curve outwards B) Tangent to the curve opposite to the direction of the car's motion C) Perpendicular to the curve inwards D) Tangent to the curve in the forward direction E) There is no friction on the car because its speed is constant

Perpendicular to the curve inwards

For general projectile motion with no air resistance, the horizontal component of a projectile's velocity A) continuously decreases B) Remains Zero C) First decreases then increases D) Remains a non-zero constant

Remains a non-zero constant

If you stood on a planet having a mass 4x that of Earth, and a radius 2x that of Earth, how much would you weigh on that planet?

Same as you do on Earth

You are in a train traveling on a horizontal track and notice that a piece of luggage starts to slide directly towards the front of the train. From this observation you can conclude that the train is: A) slowing down and changing direction B) changing direction C) speeding up and changing direction D) Speeding up

Slowing down and changing direction

The reason an astronaut in an Earth's satellite feels weightless is that A) the astronauts acceleration is zero B) the astronaut is at a point in space where the effects of the moon's gravity and Earth's gravity cancels C) The astronaut is beyond the range of Earth's gravity D) The astronaut is falling

The astronaut is falling

An object is moving with a constant non-zero velocity. Which of the following statements must be true? A) A constant force is being applied to it in the direction it was moving B) Its acceleration is in the same direction as its velocity C) A constant force is being applied to it in the direction opposite of motion D) the net force on the object is zero

The net force on the object is zero

An auto manufacturer advertises that their car can go "from zero to sixty in eight seconds." This is a description of what characteristic of the car's motion? A) Instantaneous speed B) displacement C) Average speed D) Average acceleration

average acceleration

Two objects are dropped from a bridge, an interval of 1.0s apart. Air resistance is negligible. During the time that both objects continue to fall, their separation: A) stays constant B) increases at first, but then stays constant C) increases D) decreases at first, but then stays constant E) decreases

increases

A hypothetical planet has a mass one-half that of the Earth and a radius of twice that of the Earth. What is the acceleration due to gravity on the planet in terms of g, the acceleration due to gravity at the surface of the Earth? A) g/4 B) g/16 C) g/2 D) g/8 E) g

g/8

An elevator suspended by a vertical cable is moving downward but slowing down. The tension in the cable must be A) Greater than the weight of the elevator B) Equal to the weight of the elevator C) Less than the weight of the elevator

greater than the weight of the elevator

Suppose that a car traveling to the west (-x direction) begins to slow down as it approaches a traffic light. Which statement concerning acceleration must be correct? A) its acceleration is negative B) Its acceleration is decreasing in magnitude as the car slows down C) Its acceleration is positive D) Its acceleration is zero

Its acceleration is positive

a rock is thrown from the upper edge of a tall cliff at some angle above the horizontal. It reaches its highest point and starts falling down. Which of the following statements about the rocks motion are true just before the ground A) Its horizontal velocity component is the same as when it was launched B) its velocity is vertical C) its vertical velocity is the same as when it was launched D) its speed is the same as when it was launched E) Its horizontal velocity component is zero

Its horizontal velocity component is the same as when it was launched

A woman is straining to lift a large crate, without success because it is too heavy. We denote the forces on the crate as follows: P is the upward force the woman exerts on the crate, C is the vertical contact force exerted on the crate by the floor, and W is the weight of the crate. How are the magnitudes of these forces related while the woman is trying unsuccessfully to lift the crate?

P+C=W

Three boxes are pulled along a horizontal frictionless floor by a constant horizontal pull P. The boxes are connected by very light horizontal strings having tensions T1 and T2 as shown in the figure. Which of the following statements about the tensions is correct? (There could be more than one correct choice.) A) T1 + T2 = P B) T1>T2 C) T1 = P D) T2>T1 E) T2=P

T1>T2

Satellite A has twice the mass of satellite B, and moves at the same orbital distance from Earth as satellite B. Compare the speeds of the two satellites. A) the speed of B is one-half the speed of A B) the speed of B is equal to the speed of A C) the speed of B is twice the speed of A D) the speed of B is one-fourth the speed of A E) the speed of B is four times the speed of A

The speed of B is equal to the speed of A

which of the following is possible? A) an object has zero velocity but non-zero acceleration B) an object has constant non zero acceleration and changed velocity C)An object has velocity directed east and acceleration directed east D) an object has velocity directed east and acceleration directed west E) an object has constant nonzero velocity and changing acceleration

an object has constant nonzero velocity and changing acceleration

A pilot drops a package from a plane flying horizontally at a constant speed. Neglecting air resistance, when the package hits the ground the horizontal location of the plane will

be directly over the package

When an object moves in uniform circular motion, the direction of its acceleration is: A) in the same direction as its velocity vector B) depends on the spread of the object C) in the opposite direction of its velocity vector D) is directed away from the center of its circular path E) is directed towards the center of its circular path

directed towards the center of its circular path

Suppose a ball is thrown straight up and experiences no appreciable air resistance. What is its acceleration just before it reaches its highest point? A) slightly less than g B) zero C) slightly greater than g D) Exactly g

exactly g

If the velocity of an object is zero, then that object cannot be accelerating. A) True B) False

false

if the velocity of an object is zero then it is accelerating A) True B) False

false