A motorcyclist rides in a vertical circle in a hollow sphere of radius 14 m. Find the minimum speed required so that he does not lose contact with the sphere at the highest point.

The mass of a cycle is 30 Kg.The cycle is revolving around a point. The radius of the circle formed is 40 m. The speed of the rotation is 5 m/s. the centrifugal force acting on the ball is ______

1. 20 N
2. 48 N
3. 18.75 N
4. 25 N

What is mass of a car which is revolving around a point. The radius of the circle formed is 120 m. The speed of the rotation is 5 m/s. the centrifugal force acting on the ball is 200 N.

1. 500 Kg
2. 750 Kg
3. 960 Kg
4. 1000 Kg

What is the centrifugal force acting when a ball is swirling around a point as it is tied to a rope. The radius of the circle formed is 20 cm. The mass of the ball is 300 gm. The speed of the rotation is 5 m/s.

1. 37 N
2. 37.5 N
3. 38 N
4. 38.5 N

If car A and car B are both traveling at the same speed, which will require a higher centrifugal force?

1. Car A
2. Car B
3. Both will require same
4. Incomplete information 

Identify what is wrong in the diagram?

1. Velocity
2. Centripetal force
3. Centrifugal force
4. None

What is the difference between centripetal and centrifugal force?

1. Centripetal force is towards the center, centrifugal is tangential.
2. Centripetal force is towards the center, centrifugal is outwards.
3. Centripetal force is tangential, centrifugal is outwards.
4. Centripetal force is tangential, centrifugal is inwards.

Which of the following is NOT an example of centrifugal force at work?

An object moves in a circular path at a constant speed. Compare the direction of the object’s velocity and centrifugal force.

1. Both are in the same direction
2. Both are in opposite direction
3. Both are perpendicular to each other
4. Incomplete information

Which of these is not the unit for centripetal force?

1.  
2. N
3. J/m
4. Ergs

A motorcyclist rides in a vertical circle in a hollow sphere of radius 16 m. Find the minimum speed required so that he does not lose contact with the sphere at the highest point.

1. 16 m/s
2. 15.5 m/s
3. 13 m/s
4. 12.5 m/s

Speed becomes ¼ th

1. 16 times
2. 1/16 times
3. 4 times
4. ¼ times

Mass doubles

1. 2 times
2. ½ times
3. 4 times
4. ¼ times

Radius triples

1. 9 times
2. 1/9 times
3. 3 times
4. 1/3 times

Identify the force being depicted by the red arrow?

1. Centripetal force
2. Centrifugal force
3. Normal force
4. Elastic force

A car is rounding a bend as shown in the diagram. Which arrow correctly shows the direction of the centrifugal force applied on the car?

1. A
2. B
3. C
4. D