Physics test

Which of the following is NOT a unit of angular displacement?

• Meters

• Revolutions

• Radian

• Degree

As the rotational speed of a space habitat increases, the weight of people inside 

• decreases
• increases
• stays the same

If a car travels in a circle with constant speed, then the net force acting on the car is:

• is zero because the car is not accelerating.
• is directed forward, in the direction of travel.
• is directed toward the center of the curve.
• undetermined

If Earth rotated more slowly about its axis, your weight would 

• decrease
• increase
• stay the same

When a railroad train rounds a banked track, the centripetal force needed comes not from friction, but from the 

• vertical component of the normal force.
• horizontal component of the normal force.
• normal force.

The centripetal force exerted on stunt motorcyclist Biker Bob while riding on the inner vertical surface of a circular track is 

• Friction
• his weight
• the normal force
• none of the above

Stunt motorcyclist Biker Bob rides his bike inside a futuristic rotating space station-a giant rotating donut-shaped structure in space. The normal support force feels like weight to him. As he rides his bike in the same direction that the station rotates, the normal force 

• remains unaffected
• increases
• decreases

Where is the center of gravity of a softball bat located?

• Exactly halfway along the bat
• In the thin handle
• In the more massive end of the bat

An object will fall over if its center of gravity is 

• outside the object.
• too low.
• not over its area of support
• too high.

When you carry a heavy load with one arm, why do you tend to hold your free arm away from your body?

• To change the mass of your body
• To be ready to grab something in case you fall
• To look good
• To change the center of gravity of your body and the load