Gravitation unit Review

When Abigail drops a basketball from the top of a building, what do you expect to observe as it falls?

• The basketball speeds up as it falls.

• The basketball moves at a constant speed as it falls.

• The basketball slows down as it falls.

Olivia and Henry are standing on the roof of a building. They each have a ball; Olivia has a bowling ball and Henry has a soccer ball. If they drop their balls at the same time and air resistance is negligible, the two balls will hit the ground at the same time. Do you agree or disagree with this statement?

• Agree

• Disagree

Ethan has a 100 g red ball and a 1000 g blue ball. He is holding one in each hand and wants to see which ball will hit the ground first if dropped. Ethan stands on a chair and drops both balls from the same height, at the same time. Which ball will hit the ground first, if we assume that air resistance is negligible?

• The blue ball

• The red ball

• They will hit at the same time

On Earth and in the absence of air resistance, gravitational acceleration and gravitational force are the same for all objects.

• True
• False

Ava is skydiving and is in free-fall through the air. There is gravitational force acting on her. In which direction is the force of air resistance acting on Ava as she falls?

• There is no air resistance acting on Ava.

• The same direction as the gravitational force.

• The opposite direction of the gravitational force.

• We cannot tell with this information.

Lily and James are conducting an experiment on Earth. They drop a feather and a hammer from the same height at the same time. If we assume that air resistance is NOT NEGLIGIBLE in this situation, which will reach the ground first, if either?

• The hammer

• The feather

• Both will reach the ground at the same time

Abigail is conducting an experiment by dropping a 100 kg probe towards the surface of Mars. Before being dropped, the probe has a vertical velocity of 0 m/s, and it takes 5 seconds to reach a velocity of 20 m/s. What was the probe’s change in velocity? IGNORE THE UNIT.

Ava is conducting an experiment on Mars. She drops a 100 kg probe towards the surface of Mars. Before being dropped, the probe has a vertical velocity of 0 m/s, and it takes 5 seconds to reach a velocity of 20 m/s. What is the probe’s acceleration? IGNORE THE UNIT.

Avery and Mia are playing with a swing in the park. The swing moves back and forth, as shown in the diagram below. In which position would the swing have the greatest gravitational potential energy?

• Both 1 and 5

• Position 1

• Position 2

• Position 3

• Position 4

Noah is skateboarding up a frictionless half pipe. As Noah goes higher up the half pipe, what energy conversion is taking place?

• KE is converted into GPE.

• KE is converted into EPE.

• KE is converted into thermal energy.

• KE is converted into CPE.