FREE FALL

Click on the check box if you think the statements is correct.

Question : In a condition that a big rock and a pebble are being thrown from a very high mountain from the same height and at the same time. Suppose also that air resistance is neglected. Which statements below is true in describing both objects?

• The big rock and the pebble each have the same force of gravity.

• The big rock has more mass, thus both objects will have different force of gravity.

• The big rock experiences a greater force of gravity, yet both the rock and feather have the same mass.

• On earth, all objects (whether the rock or the pebble) will have different force of gravity.

• The big rock weighs more than the feather, yet they each have the same mass.

Consider a heavy and a light person jumping together with same-size parachutes from the same altitude. Who will reach the ground first? (in NON-freefall)

• Light person

• Heavy person

• Both will reach at the same time.

Tags

NGSS.HS-PS2-1

Consider a heavy and a light person jumping together from the same altitude IN FREE FALL. Who will reach the ground first?

• Light person

• Heavy person

• Both will reach the ground at the same time.

As a rock in FREE FALL falls through the air, Velocity

• stays constant

• decreases until it hits terminal velocity

• increases until it hits terminal velocity

• increases ~10 m/s each second

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-4

As a rock in FREE FALL falls through the air, acceleration

• stays constant

• decreases until it hits terminal velocity

• increases until it hits terminal velocity

• increases ~10 m/s each second

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-4

Air friction (Air Drag) against a skydiver

• acts upward

• increases with increased surface area

• increases with increased speed

• all of these

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.HS-PS2-4

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.HS-PS2-1

NGSS.HS-PS2-4

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 

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-5