1.2.6 Free Fall

The state that exists when the only force acting on an object is gravity is called

• free fall

• inertia

• acceleration

• momentum

The acceleration due to gravity near the surface of Earth is equal to

• 9.8 m/s

• 9.8 kg x m/s

• 9.8 N

• 9.8 m/s²

What happens to the total distance  that a ball travels as it falls off the side of a cliff?

• The distance remains constant 
• The distance increases at a uniform rate
• The distance increases at a nonuniform rate 
• The distance decreases at a uniform rate

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

In a normal environment, why does a bowling ball and feather hit the ground at different times when dropped from the same height?

• They don't; they hit the ground at the same time.
• One is more dense than the other.
• One is heavier than the other.
• Air resistance 

A ball is thrown in the air with an initial velocity of 40 m/s. How long does it take to reach back to the point it was thrown from?

• 4 seconds 
• 2 seconds 
• 6 seconds 
• 8 seconds 

A ball is thrown up in the air with an initial velocity of 40 m/s. What is the ball's velocity after 2 seconds? 

• 0 m/s 
• 20 m/s traveling upward
• 20 m/s traveling downward
• 40 m/s traveling downward

TRUE or FALSE:

A falling skydiver which has reached terminal velocity is considered to be in a state of free fall.

• TRUE

• FALSE

TRUE or FALSE:

An object that is free-falling is acted upon by the force of gravity alone.

• TRUE

• FALSE

TRUE or FALSE:

A ball is thrown upwards and is rising towards its peak. As it rises upwards, it is NOT considered to be in a state of free fall.

• TRUE

• FALSE