UCM Review

1. A car goes around an unbanked (flat) horizontal circle of radius r at a constant tangential velocity v.  What is the magnitude of the force of gravity’s contribution to the centripetal force this car experiences?

• 0

• 1/2at²

• mv²/r

• mg

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-4

What is the centripetal acceleration upon a car negotiating an unbanked curve with a radius of 40.0 m if it travels at a speed of 10 m/s? (type just the number)

Tags

NGSS.HS-PS2-1

If you swing a bucket of water fast enough in a vertical circle, at the highest point the water does not spill out because of...

• The inertia of the water in the bucket

• The centripetal force acting on the water

• The force of gravity acting on the bucket

• An outward force equal to the centripetal force.

Tags

NGSS.MS-PS2-4

Where should you sit on a merry go round if you want to move the slowest?

• As close to center as possible

• As close to the edge as possible

• It does not matter how close to the center you are

Tags

NGSS.MS-PS2-2

A real daredevil wants to experience as much acceleration as possible while riding a merry go round - where should she sit?

• Towards the center of the ride

• Towards the edge of the ride

• All points will experience the same acceleration

• No points on the ride will experience acceleration because it moves at a constant speed

If the earth were suddenly moved 3 times further away from the sun than it is now, how would the force of gravity acting on the Earth compare to what it currently is

• It would be 1/3 the magnitude

• It would be 1/9 the magnitude

• It would be 3 times the magnitude

• It would be 9 times the magnitude

Tags

NGSS.MS-ESS1-2

NGSS.MS-PS2-4

In uniform circular motion, the net force acting on the moving object acts towards the ________ of the circle

In uniform circular motion, the tangential velocity of the moving object is ______

If the moon were suddenly moved 2 times closer to the earth than it is now, how would the force of gravity acting on the moon compare to what it currently is?

• It would be 1/2 the magnitude

• It would be 2 times the magnitude

• It would be 4 times the magnitude

• It would be 1/4 the magnitude

Tags

NGSS.MS-PS2-2

If you spin a ball attached to a string fast enough in a horizontal circle, at the highest point the ball does not fly off because of...

• The force of friction acting on the ball

  centripetally

• The force of tension acting on the ball centripetally

• The force of gravity acting on the ball

  centripetally

• The force of normal force acting on the ball

  centripetally