Freefall

Which of the following statements applies to the motion of a ball tossed upward?

I. It has constant acceleration on the way up

II. It has constant acceleration at the top of its path

III. It has constant acceleration as it moves downward.

• I only

• I and III

• III only

• All are correct

Tags

NGSS.HS-PS2-1

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

• 9.81 m/s²

• 0.0 m/s²

• 9.81 m/s

• 0.0 m/s

Tags

NGSS.HS-PS2-4

A ball is tossed upward and caught at the same position of throw. In the absence of air resistance, the speed of the ball when it is caught would be

• less than the speed it had when tossed upwards

• the same as the speed it had when tossed upwards

• more than the speed it had when tossed upwards

Tags

NGSS.MS-PS3-5

When the only force acting on an object is gravity, and an object moves through he air it is called

• momentum

• acceleration

• inertia

• free fall

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

How do free falling objects move?

• Falling objects accelerate at -9.8 m/s²

• Falling object move at constant velocity

• Falling objects accelerate at 100 m/s²

• It depends on the mass: heavy objects accelerate, light objects do not

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-4

A baseball catcher throws a ball vertically upward and catches it in the same spot as it returns to the mitt. At what point in the ball’s path does it experience zero velocity and acceleration is NOT ZERO at the same time?

• the instant it leaves the catcher’s hand

• midway on the way up

• at the top of its path

• the instant before it arrives in the catcher’s mitt

Tags

NGSS.HS-PS2-1

A girl throws a ball straight up in the air. When does the ball accelerate down?

• On the way up.

• On the way down.

• At the top.

• All of the above

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-4

If a rocket sled starts from rest, how far does it go if it accelerates at 45 m/s² for 3.0 s?

• 15 m

• 135 m

• 5.0 m

• 202.5 m

Tags

NGSS.HS-PS2-1

A ship starts out moving at 14 m/s. It catches a breeze that accelerates it at 0.80 m/s² for 25 s. How fast is it moving at the end of the 25 s?

• 34 m/s

• 20 m/s

• -6 m/s

• 11.2 m/s

Tags

NGSS.HS-PS2-1