Physics B Final

When an object is released from rest and falls in the absence of friction, which of the following is true concerning its motion?

• The speed is constant.

• The acceleration is constant.

• The velocity is constant

• It depends on the object.

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A ball is thrown straight up, reaches a maximum height, then falls to its initial height. Make a statement about the direction of the velocity and acceleration as the ball is going up.

• Both its velocity and its acceleration point upward.

• Its velocity points downward and its acceleration points upward.

• Its velocity points upward and its acceleration points downward.

• Both its velocity and its acceleration point downward.

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If the position versus time graph of an object is a horizontal line, the object is

• moving with constant non-zero acceleration

• at rest

• moving with infinite speed

• moving with constant non-zero speed

If the acceleration of an object is zero, the objects velocity is

• Zero

• constant

• decreasing

• increasing

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The difference between speed and velocity is

• velocity has direction, speed does not

• speed is always greater than velocity

• they mean the same thing

• velocity can change but speed is always constant

An object with a mass of m is thrown straight up near the surface of the earth. While the object is going up, the net force on it is

• Less than mg

• More than mg

• Zero

• Equal to mg

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The total number of forces acting on a box that is being pushed across a rough table at constant velocity is

• 1

• 2

• 3

• 4

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The forces acting on a box that is being pushed across a rough table are

• gravity, normal force, applied force and friction

• gravity, tension and normal force

• normal force, applied force and friction

• gravity, momentum, pressure and friction

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A large truck collides with a small car causing a lot of damage to the small car. During the collision they both experience the same amount of force. This is an example of which of Newtons Laws of Motion?

• 1st Law

• 2nd Law

• 3rd Law

• 4th Law

A rock is dropped from the top of a bridge. A second rock is thrown straight down from the same bridge. They are released at the same time. Neglecting air resistance, compare the accelerations of the two rocks.

• The first rock accelerates faster

• The second brick accelerates faster

• The two bricks accelerate at the same rate

• It is impossible to determine from the information given.

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