Unit 5: Circular Motion & Gravitation

Calculate the acceleration due to gravity on Mars. Radius is 3,400,000 m. And mass of the moon is 6.42 x 10²³ kg

• 1.6 m/s²

• 3.4 m/s²

• 3.7 m/s²

• 4.1 m/s²

Calculate the acceleration of gravity on the planet Neptune. It has a mass of 1.02 x 10²⁶ kg and a radius of 25,000,000 m

• 9 m/s²

• 10 m/s²

• 11 m/s²

• 12 m/s²

A force of F acts between two objects of equal mass. If the distance between each (center-to-center) is doubled, then the force will...

• double

• increase 4 times

• halve (1/2)

• decrease to 1/4th

A 10 kg mass and a 5 kg mass are separated by 2.0 meters. The object that feels a greater gravitational pull is...

• The 10 kg mass

• The 5 kg mass

• Both feel the same force

• Depends if they are moving

How far from the surface of the Earth does an astronaut need to go to not experience the force of gravity from the earth?

• An astronaut will always experience a force of gravity.

• An altitude of 100 miles

• An altitude of 200 miles

• Any distance above the atmosphere, as long as they are in freefall.

Calculate the acceleration due to gravity on the space station, which is 6,734,000 m from the center of the 5.98 x 10²⁴ kg earth.

• 8.8 m/s²

• 0

• 9.8 m/s²

• 1.2 m/s²

Two masses experience a force of F acting between them. Which of the following would double the force to 2F?

• Increase one object's mass by twice its original value.

• Increase both object's mass by twice its original value.

• Double the distance between the objects.

• Halve the distance between the objects.

An object is orbiting around a massive object in a perfect circular path, when the central object mysteriously disappears. If the force of gravity is removed, then describe the motion of the object:

• It continues in a straight path.

• It continues to travel in a circle.

• It travels in a spiral pattern

• It's motion curves outward

Objects that are orbiting

• Are falling toward the central object.

• Experience no gravity.

• Must be in perfect circular orbits.

• Are not being orbited themselves.

Tags

NGSS.HS-ESS1-4

NGSS.HS-PS2-4

Centripetal force, created by swinging something in a circle, acts in a direction--

• along the path of motion

• away from the center of the circle

• toward the center of the circle

• tangent to the circle