Ch7 Circular motion and gravitation

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?

• 
• 
• 
• 

Two objects are attracted to each other with 36 N of gravitational force.
What would the force between them be if one of the masses were doubled?

• 9
• 18
• 72
• 144

a car going around a curve - identify the centripetal force:

• friction

• tension

• force normal

• force weight

What did Newton say about the gravitational force between distant objects?

• It is independent of distance

• It is inversely related to distance squared

• It is proportional to distance squared

• It is inversely related to mass squared

• It is zero, unless the objects are touching

Earth pulls satellite, and satellite pulls Earth. Which of the forces is stronger?

• Earth pulling satellite

• Satellite pulling Earth

• Both the same

• Not enough information to determine

Force of gravity is directly proportional to

• Mass
• Weight
• Distance
• Time

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

• outwards
• towards the center
• tangent
• faster

Which of the following is Newton's Law on Gravitation?

• F=Gm₁m₂/r
• F = Gm₁m₂/r²
• F = Gm₁m₂/2r
• F = m₁m₂/2r

Newton said that any two masses will...

• combine into a larger mass.

• create gravitational fields.

• attract each other.

• push each other apart.

Jupiter is a much more massive planet than Earth. If you traveled to Jupiter, your mass would

• increase

• remain the same

• decrease

• non of the above