Uniform Circular Motion | 135 plays

1.

Multiple Choice

3 mins

1 pt

If an object is spinning around on a string and the string was suddenly cut, the object would move in a

curved path

straight line

2.

Multiple Choice

3 mins

1 pt

When an object is moving in a circle, its linear velocity is often called its __________ velocity.

centripetal

tangential

gravitational

centrifugal

3.

Multiple Choice

3 mins

1 pt

What happens to the centripetal force exerted on an object if you triple the velocity?

it increases to 3X

it decreases to 6X

it increases to 6X

it increases to 9X

4.

Multiple Choice

3 mins

1 pt

During its trip a car of mass 1500kg is traveling around a corner as shown in the picture. The car rounds a corner of radius 100m at a speed of 15m/s. Find the centripetal force acting on the car.

300N

15000N

3375N

15N

5.

Multiple Choice

3 mins

1 pt

During its trip a car of mass 1500kg is traveling around a corner as shown in the picture. What actual force is equivalent to the centripetal force in this situation?

Tension

Friction

Centripetal force

gravity

6.

Multiple Choice

3 mins

1 pt

When an object is in circular motion it is constantly changing its velocity.

True

False

7.

Multiple Choice

3 mins

1 pt

Why do objects experience centripetal acceleration even though they can have a constant speed?

Because they are speeding up as they move in a circle

Because they are constantly changing direction and hence, velocity changes, and that net change is directed inward.

Because they are constantly changing both speed and direction

Because when you have 100 people pedaling, you can speed up more easily.

8.

Multiple Choice

3 mins

1 pt

Decreasing the radius when making a turn allows you to____?

Increase your friction

Keep a high speed

Change your inertia

Decrease gravitational pull

9.

Multiple Choice

3 mins

1 pt

Which statement is true about an object that is traveling in uniform circular motion?

The speed of the object varies.

The net force on the object is directed toward the center of the circular path.

The direction of the object's velocity is constant.

The net force on the object is directed away from the center of the circular path.

10.

Multiple Choice

3 mins

1 pt

The velocity is always _____ to the line of a circle.

outwards

towards the center

tangent

faster

11.

Multiple Choice

3 mins

1 pt

What's the centripetal force of a 0.2 kg yoyo spun in a circle with a radius of .7 meters at a velocity of 3 m/s?

2.05 N

2.57 N

2.90 N

3.13 N

12.

Multiple Choice

3 mins

1 pt

You are moving a ball in a circle using 72 N of centripetal force. What would the force be if you doubled the radius of the circle.

18 N

36 N

72 N

144 N

13.

Multiple Choice

3 mins

1 pt

Calculate the centripetal force required to make a 5 kg ball move 4 m/s in a circle with a radius of 2 m.

10 N

20 N

30 N

40 N

14.

Multiple Choice

3 mins

1 pt

Which of the following depict the speed of the blowing ball?

A

B

C

D

15.

Multiple Choice

3 mins

1 pt

Which represents the acceleration of the ball?

A

B

C

D

16.

Fill in the Blank

3 mins

1 pt

The figure shows a coin on a turn-table is rotating at 1.0 r.p.s. The coefficient of static friction between the coin and the turn-table is 0.50. The maximum distance of the coin from the centre O of the turn-table for it to move in a circle is _____________.

17.

Fill in the Blank

3 mins

1 pt

A 1.3 m long fishing line rated as "10 lb test" that can stand a force of 10 lb (44.48 N) is attached to a rock of mass 0.5 kg. The maximum speed at which the rock can be rotated without breaking the line is __________.

18.

Fill in the Blank

3 mins

1 pt

An object is moving round a horizontal circle of radius 0.80 m, at a constant angular frequency of 20 rpm. The centripetal acceleration of the object is ___________.

19.

Fill in the Blank

3 mins

1 pt

A particle moves in a horizontal circle of radius 0.60 m with a constant speed and a period of revolution of 0.02 s. The linear velocity of the particle is ____________.

20.

Fill in the Blank

3 mins

1 pt

A particle moves in a horizontal circle of radius 0.60 m with a constant speed and a period of revolution of 0.02 s. The frequency of the revolution is _____________.

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