Free Fall Concept

What does it mean for an object to be in free fall?

• Only air resistance acting on the object.

• Gravity is the only force acting on the obejct.

• Any object that is in downward motion.

Tags

NGSS.MS-PS2-2

When an object falls in physics world, what happens?

• It accelerates at a constant rate until it hits the ground

• It accelerates at a non-constant rate until it hits the ground

• It accelerates at a constant rate until it reaches terminal velocity

• It accelerates at a non-constant rate until it reaches terminal velocity

Which of the following statements applies to the motion of a ball rising and then falling in free fall?
I. The ball has constant acceleration as it moves upward.
II. The ball has constant acceleration at the top of its path.

III. The ball has constant acceleration as it moves downward.

• I only
• III only
• I and III
• I, II, and III

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-4

A ball is thrown upwards and caught when it comes back down. In the absence of air resistance, the speed of the ball when caught would be 

• less than the speed it had when thrown upwards.
• more than the speed it had when thrown upwards.
• the same as the speed it had when thrown upwards.

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-5

1. A ball is thrown vertically as shown in the figure below. At what point in the ball’s path does it experience zero velocity and nonzero acceleration at the same time?

• P

• Q

• R

• S

Tags

NGSS.HS-PS2-1

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

Tags

NGSS.MS-PS2-2

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

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-4

Two rocks with different size and mass are dropped from the same height. Which of the rock will reach the ground first?

• greater rock

• smaller rock

• both reach the ground at the same time

Tags

NGSS.MS-PS2-4