Question 1 The study of Uniform Circular Motion relates to objects traveling wit

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Question 1

The study of Uniform Circular Motion relates to objects traveling with constant speed around a circle with radius, R. Since the object has a constant speed along a circular path, we can also say that

A)

the object has zero velocity.

B)

the object has a constant acceleration magnitude.

C)

the object has zero acceleration.

D)

the object has a constant velocity.

E)

the object has an increasing acceleration.

Question 2

Uniform Circular Motion (UCM) problems are just a special case of Newton’s 2nd law. In these problems, you must define two orthogonal directions similar to the way the “x” and “y” directions are usually defined. In the case of UCM, however, the two directions are the “y” direction and the “c” direction, which is

A)

centrifugal direction which means seeking the outer rim.

B)

colonial direction which means seeking to end taxation without representation.

C)

circular direction which means seeking the circumference.

D)

centripetal direction which means seeking the center.

E)

cellophane direction which means seeking to be absolutely clear.

Question 3

You are riding in a friend's new Corvette with the 5-point harness securing you in the cockpit. He takes a hard turn to the left at 120 mph (in a 50 mph zone). You feel pressed against the right side of the car because

A)

there is a force acting on you pushing you to the right, or the outside of the circle.

B)

there is a force acting on the car pushing it to the left, or the inside of the circle.

C)

there is a pair of forces pushing the tires one way and the exhaust pipe in the other.

D)

there is a force acting on the earth causing it to rotate more quickly.

E)

you are leaning to the right as consequence of Newton’s universal gravitational force.

Question 4

A swinging ball is in a horizontal circular motion once it is attached to a string. If the ball is released from the string, it will move:

A)

In an unknown direction relative to the release point.

B)

Away from the center of the circle.

C)

Continues to move along the circle for a short distance.

D)

Along the tangent to the circle.

E)

Who cares, what direction.

A)

the object has zero velocity.

B)

the object has a constant acceleration magnitude.

C)

the object has zero acceleration.

D)

the object has a constant velocity.

E)

the object has an increasing acceleration.

Explanation / Answer

1.)(B) the magnitude of the acceleration of the object is constant i.e centripetal acceleration = mv2/r

2.)(A) the other direction is the centrifugal direction, seeking the outer rim

3.)(B) centripetal force acts on the car pushing it away from the center. due to which in the frame of car centrifugal force acts on the person sitting in the car.

4.) (D)when the ball loses contact with the string, the force acting on it is zero. hence it moves with constant velocity in the tangential direction

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