Circular Motion & Gravitational Force

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

A 10kg car travels at a constant speed of 20.0 m/s around a horizontal circular track. Which diagram correctly represent the direction of the car's velocity (v) and the direction of the centripetal force (Fc) acting on the car at a particular moment?

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Calculate the mass of an object if it took 20 N to rotate it in a circle with a radius of 2 meters with a velocity of 4 m/s

• 4.1 kg
• 3.6 kg
• 2.5 kg
• 1.8 kg

What's the centripetal acceleration of a .2 kg yoyo spun in a circle with a radius of .7 meters at a velocity of 3 m/s?

• 8.23 m/s²

• 10.54 m/s²

• 12.86 m/s²

• 17.39 m/s²

What is the net force?

• 10 N
• 0 N
• 25 N
• 1 N

Calculate the velocity of an object moved around a circle with a radius of 1.65 m and an acceleration of 3.5 m/s².

• 2.4 m/s
• 3.6 m/s
• 3.9 m/s
• 4.2 m/s

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

Complete the following statement: The farther away two planets are the _______ the gravitational force between them.

• more
• same
• dosen't matter
• less

Gravity on moon is less than the gravity on earth because

• a. moon's mass is less

• b. moon's mass is more

• c. moon's mass is equal to Earth

• d. moon has no mass

A car is rounding a curve as shown in the diagram. Which arrow correctly shows the direction of the centripetal force keeping the car in circular motion?

• A

• B

• C

• D