free fall

Which object would fall with greater acceleration in a vacuum - leaf or pebble?

• The leaf

• The pebble

• Difficult to determine without more information

• Both accelerate at the same rate

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

A hammer is dropped on Earth and the Moon. If gravitational pull on the Moon is about six times weaker than on Earth, where does a hammer fall faster?

• Moon

• Earth

• No difference

• Depends on the mass of the hammer

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

• momentum

• acceleration

• inertia

• free fall

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

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 due to gravity 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

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

Which of these units below represents acceleration?

• meters/second

• meters/second squared

• Newtons

• Joules

• Kg*m/s

An object is fired straight up at 40 m/s. What is its speed after 6 seconds?

• 0 m/s

• 18.8m/s

• 28.8 m/s

• 42 m/s

A bowling ball and a bag of potato chips are dropped at the same time from a tall tower on the Moon. There is no air on the Moon. What happens?

• Bag of chips hits the surface first

• Bowling ball hits the surface first

• Both hit the surface at the same time