Physics 11 Circular Motion

The force that keeps the body moving in circular motion is _______

• Centripetal force

• Centrifugal force

• Force of gravity

• Reaction forces

The mathematical expression for centripetal force is

• mv²/r

• mv/r

• v²/r

• mv³/r

A body of mass 10 kg, is moving with a velocity of 5 m/s in a circle of radius 5 m, what is the centripetal acceleration of the body?

• 5m/s²

• 25m/s²

• 0.5 m/s²

• 50 m/s²

The centrifugal force always acts ____

• Towards the center

• Away from the center

• In tangential direction

• Outside of the plane of motion

A ball is being rotated in a circle of radius 5 m with a constant tangential velocity of 20 m/s. A stone is also being rotated in a circle of radius 4 m with a constant tangential velocity of 16 m/s. Which one of the following choices is true about both the circular motions?

• Both have same angular velocity

• Both have different angular velocity

• Angular velocity of ball > angular velocity of stone

• Angular velocity of stone > angular velocity of ball

The angular velocity of a stone being rotated is 11 rad/s. What is the angular displacement covered in 0.5s?

• 5.5 rad

• 0.55 rad

• 55 rad

• 0.5 rad

A body is moving in a vertical circular motion. Which one of the following forces does it not experience?

• Force of gravity

• Centripetal force

• Normal reaction force

• Centrifugal force

A body of weight 20 N, mass 2 kg is moving in vertical circular motion with the help of a string of radius 1 m and with a velocity of 2 m/s. What is the tension in the string at the lowest point?

• 28 N

• 20 N

• 8 N

• 15 N

A body of weight 20 N, mass 2 kg is moving in vertical circular motion with the help of a string of radius 1 m and with a velocity of 5 m/s. What is the tension in the string at the highest point?

• 30 N

• 50 N

• 20 N

• 25 N

At which position in vertical circular motion is the tension in the string minimum?

• At the highest position

• At the lowest position

• When the string is horizontal

• At an angle of 35° from the horizontal