Physics Ch 10 Circular Motion

Which has greater linear speed, a horse near the outside rail of a merry-go-round or a horse near the inside rail?

• Inside

• Outside

• Neither- they are the same

Which has greater angular speed, a horse near the outside rail of a merry-go-round or a horse near the inside rail?

• Inside

• Outside

• Neither- they are the same

Which of the following is NOT a unit of rotational speed?

• meters per second

• revolutions per minute

• revolutions per second

• rotations per minute

What is the direction of teh force that acts on the clothes in the spin cycle of a washing machine?

• inward

• outward

• down

• up

Tags

NGSS.HS-PS2-1

A tin can whirled on the end of a string moves in a circle because...

• the can continually pulls on the string

• once the can starts moving, that is the natural tendency.

• there is a force on the can pulling it outward.

• there is an inward force pulling on the can.

If you whirl a tin can on the end of a string and the string suddenly breaks, the can will...

• fly directly away from you

• fly off tangent to its circular path

• fly directly toward you

• spiral inward toward your hand

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-2

A ladybug rests in the bottom of a tin can that is being whirled horizontally on teh end of a string. Since the ladybug, like the can, moves in circle, there must be a force on it. What exerts the force?

• gravity

• the string

• there is no force acting on it

• the can

"Centrifugal forces" are an apparent reality to observers in a reference frame that is

• rotating

• an intertial reference frame

• moving at constant velocity

• at rest

A person weighs less at the equator than at the poles. The reason for this has to do with the

• tidal bulges

• influence of the sun, moon, and teh planets

• higher temperatures at the equator, and expansion of matter

• spin of the earth.

A car travels in a circle with constant speed. The net force on the car

• is zero because the car is not accelerating

• is directed forward, in the direction of travel

• is directed toward the center of the curve

• is directed toward the outside of the curve