Round 1: Elimination Round

What happens to the velocity of a ball as it is dropped off a cliff? 

• It decreases at a uniform rate 
• It increases at a uniform rate 
• It is constant 
• It increases at a non-uniform rate

If you throw a baseball straight up, what is its velocity at the highest point?

• 9.8 m/s²
• 9.8 m/s
• 0 m/s²
• 0 m/s

A baseball is thrown up into the air. What happens to the acceleration as the ball rises in the air?

• the acceleration increases

• the acceleration decreases

• the acceleration remains constant

A baseball is thrown up into the air. What happens to the velocity as the ball rises in the air?

• the velocity increases

• the velocity decreases

• the velocity remains constant

The standard acceleration due to gravity (or standard acceleration of free fall), is the nominal gravitational acceleration of an object in a vacuum near the surface of the Earth. It is defined by the standard as:

• 9.81 m/s.

• 9.81 m.

• 9.81 m/s².

• 9.81 s.

If an object is in free fall for three seconds, how fast will it be falling?

• 9.8 m/s

• 19.6 m/s

• 29.4 m/s

• 39.2 m/s

A pumpkin is dropped from a 35 m building. What is its initial velocity (v_i)?

• 0 m/s
• 9.81 m/s

• 19.62 m/s

• 35 m/s

What is the acceleration of an object during free fall with air resistance?

• Constant at 9.81 m/s²

• Increase from 0 to 9.81 m/s²

• Increase from 9.81 m/s²

• Decrease from 9.81 to 0 m/s²

Which would fall with greater acceleration in a vacuum—a leaf or a stone?

• the leaf
• the stone
• They would accelerate at the same rate.
• It is difficult to determine without more information.

A paintbrush is dropped from the top of a tall ladder and free falls to the ground. What changes, if any, would be observed in the brush's velocity and acceleration as it falls? Pick 2 answers.

• The velocity increases.

• The velocity decreases.

• The velocity remains a constant value.

• The acceleration changes (increases or decreases).

• The acceleration remains a constant value.