Circular Motion Test Review

A 0.4 kg ball moves in a circle that is 0.8m in radius at a speed of 4 m/s what is the centripetal acceleration?

• centripetal acceleration = 8

• centripetal acceleration = 20

• centripetal acceleration = 5

• centripetal acceleration = 2

A 0.4 kg ball moves in a circle that is 0.8m in radius at a speed of 4 m/s what is the centripetal force?

• centripetal force = 8

• centripetal force = 20

• centripetal force= 5

• centripetal force= 0.2

What direction is the gravitational force of a planet orbiting the sun?

• towards the center of the sun

• towards the center of the planet

• tangent to the orbital path

• in a straight line with a constant velocity

What direction is the velocity of a planet orbiting the sun?

• towards the center of the sun

• towards the center of the planet

• tangent to the orbital path

• in a straight line with a constant velocity

What direction would the planet go if the force of gravity suddenly disappeared?

• towards the center of the sun

• towards the center of the planet

• tangent to the orbital path

• in a straight line with a constant velocity

A 500kg race car rounds a curve with a radius of 100m. What type of force provides the centripetal force in this example?

• Force of tension

• Force of friction

• 5000 N

• 5 meters per second squared

A toy car at the end of a 0.14m long string moves in a circle on a table. The car has a mass of 4.0kg and the string has a breaking strength of 20N. What is the maximum speed the car can attain without breaking the string?

• Velocity = 35.7 m/s

• Velocity = 32 m/s

• Velocity = 0.7 m/s

• Velocity = 0.84 m/s

Force of gravity is inversely proportional to

• mass

• distance

• time

• velocity

Force of gravity is directly proportional to

• mass

• distance

• time

• velocity

What states that "every object in the universe attracts every other object"?

• The law of thermodynamics

• The theory of evolution

• Law of inertia

• Law of Universal Gravitation