Circular Motion Test: Physics

An object experiences a uniform circular motion in a horizontal plane, as illustrated. The direction of the net force is:

----> C.

An object rotates with a frequency of 50 Hz. What is the period of rotations?

0.02 s.

An object moves around a circular path at a constant speed and makes 10 complete revolutions in 5 secs. What is the frequency of rotation?

2 Hz

An object rotates with a period of 0.5 s. What is the frequency of rotations?

2.0 Hz

An object rotates with a period of 10 s. How many revolutions will it make in 25 s?

2.5

An object moves around a circular path at a constant speed and makes 5 complete revolutions in 20 secs, What is the period of the rotation?

4 s

An object rotates with a frequency of 300 Hz. How many revolutions will it make in 15 s?

4500

A pilot performs a vertical maneuver around a circle with a radius R. When the airplane is at the lowest point of the circle pilots apparent weight is 6 mg. What is the acceleration of the plane at the lowest point?

5 g

A car moves around a circular path of a constant radius at a constant speed. When the car is at the top of the circular path what is the direction of the velocity?

<-------

A car moves around a circular path of a constant radius at a constant speed. When the car is at the top of the circular path what is the direction of the acceleration?

I I Downward I V

A pilot performs a vertical maneuver around a circle with a radius R. Which is true about the pilots apparent weight?

It decreases when he moves from the lowest to the highest point of the circle.

An object travels in a circular path of radius r at a constant speed v. What happens to the objects acceleration if the radius of the circle is doubled and the speed stays unchanged?

It is cut in half

An object of mass m moves at a constant speed v around a circular path of radius r. The net force applied to the object F. What happens to the net force if the speed is doubled and the radius remains the same?

It quadruples

An object travels in a circular path of radius r at a constant speed v. What happens to the objects acceleration if the speed is doubled and the radius stays unchanged?

It quadruples

A boy stands at the edge of a rotating table. Which force prevents him from sliding off the table?

Static Friction

An object of mass m moves at a constant speed v around a circular path of radius r.The net force applied to the object F. What happens to the net force if the speed is doubled and the radius quadrupled?

Stays the same

An object travels in a circular path of radius r at a constant speed v.What happens to the objects acceleration if the radius of the circle is quadrupled and the speed is doubled?

Stays unchanged

A car moves around a circular path of a constant radius at a constant speed. Which statement is true?

The cars acceleration is directed toward the center

An object moves in a circular path at a constant speed. Which is true?

The cars acceleration is not zero and causes the change in the direction of the cars velocity.

A small ball attached to the end of a string experiences a uniform circular motion on a horizontal frictionless table. In order to keep the ball moving in a circle the string must apply force on the ball toward the center of the circle. Which refers to the action force?

The force applied by the ball on the string.

A boy stands at the edge of a rotating table. In order to keep him moving in a circular path the table applies a certain force on the boy. Which is the reaction force to this force?

The force exerted on the table by the boy that is directed straight down.

A ball of mass m attached to a light string moves at a constant speed v in a vertical circle with a radius R. Which is true about the magnitude of the net force at point A compared to that at point B?

The net force at point A is equal to the net force at point B.

A small sphere is swung in a vertical circle. Which combination represents the direction of the velocity and acceleration at the right most point of the circle?

^ | | V <------- a |

A small sphere is swung in a vertical circle. Which combination represents the direction of the velocity and acceleration at the bottom of the circle?

^ | | a -------> V |

A ball of mass m moves at a constant speed v in circular path with a radius r. Which represents the net force applied on the ball?

_mv2___ R

A coin lies on the top of a turntable at a distance R from the center. The table rotates at a constant speed v. What is the minimum coefficient of static friction that can prevent the coin from sliding off the table?

_v2_ Rg

A rollercoaster car moves on a track with one section that is a vertical circular loop of radius R. When the car is at the top of the loop it just maintains contact with the track. What is the cars acceleration at this point?

g downward

A pilot performs a vertical maneuver around a circle with a radius R. When the airplane is at the lowest point of the circle pilots weight is 4 mg. What is the velocity at the lowest point?

√(3Rg

A roller coaster car moves on a track with one section that is a vertical circular loop of radius R. When the car is at the top of the loop it just maintains contact with the track. What is the cars velocity at this point?

√(Rg

An objects moves at a constant acceleration a in a circular path of radius r. Which is the objects velocity?

√(a x r