Circular Motion Review

How does the gravitational force the Earth exerts on the sun compare to the gravitational force the sun exerts on the Earth?

• The gravitational force the sun exerts on the Earth is larger

• The gravitational force the Earth exerts on the sun is larger

• Their gravitational forces are equal

• There is not enough information

As two objects get closer together, what happens to the force of gravity between them?

• The force of gravity increases

• The force of gravity decreases

• The force of gravity stays the same, since their masses are constant

• Not enough information

A yo-yo is whirled on a string, then the string breaks. What causes the yo-yo to move off in a straight line?

• centrifugal force

• centripetal force

• inertia

• centripetal acceleration

How does the force of gravity between two objects change when the mass of one of the objects increases?

• Fg increases

• Fg decreases

• It depends on the distance between the objects

• Fg stays the same

A 12 kg object undergoes circular motion with a radius of 4 m and a speed of 18 m/s. What is the centripetal acceleration of the object?

• 1.125 m/s²

• 81 m/s²

• 4.5 m/s²

• 36 m/s²

As the distance between 2 objects increases, what happens to gravitational force?

• increases
• decreases
• stays the same
• i don't know

If I double the mass of one object, but don't change anything else... WHat happens to the gravitational force between two objects?

• Doubles
• Quadruples
• Cut in Half
• 4x Smaller

The number 6.67 x 10 -11 N* m^2 / kg^2 is called the _______________.

• universal speed constant
• the speed force
• universal gravitational constant
• Earth's gravitational constant

Centripetal acceleration always points

• in the direction of the object's motion
• in the opposite direction of the object's motion
• towards the center of the circle
• towards the outside of the circle

Which represents the acceleration of the ball?

• A
• B
• C
• D