centripetal force

Centripetal acceleration acts towards the ___________ of the circular motion

• center

• circumference

A Hot Wheels toy car races around a circular track that has a radius of 1.2 meters. It moves around the track with a velocity of 1.8 ms^-1. What is the toy’s centripetal acceleration?

• 1.5 ms^-2

• 2.7 ms^-2

• 2.16 ms^-2

• 3.89 ms^-2

A dolphin swims in a circle with a radius of 30 m and moves with a velocity of 3.2 ms^-1. What is the dolphin’s centripetal acceleration?

• 0.341 ms^-2

• 0.106 ms^-2

• 96 ms^-2

• 307.2 ms^-2

The velocity is always _____ to the line of a circle.

• outwards

• towards the center

• faster

• tangent

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

A 25kg boy is riding a merry-go-round with a radius of 5 m. What is the centripetal force on the boy if his velocity is 6 ms^-1?

• 180 N

• 150 N

• 120 N

• 245 N

A man-made satellite of mass 400 kg orbits the Earth with a radius of 8.2 x 10⁶ m. Linear speed of the satellite is 6.96 x 10³ ms^-1. What is the centripetal force acting on the satellite?

• 195.036 N

• 2363 N

• 1936 N

• 2000 N

A particle P is moving in a circle with uniform speed. Which one of the following diagrams correctly shows the direction of the acceleration a and velocity v of the particle at one instant of time?

• 
• 
• 
• 

Consider two objects in space. What happens to gravity force between them as distance increases?

• there is no gravity in space

• It decreases rapidly

• it in increases rapidly

• It does not change

Where is the net force when the rollercoaster is at the top of the loop?

• Towards the sky
• Towards the Right
• Towards the left
• Towards the ground