Chapter 5 Circular Motion

Uniform circular motion is the motion of an object in a circle with

When an object experiences uniform circular motion, the direction of the acceleration is:

• In the same direction as the velocity vector

• In the opposite direction of the velocity vector

• Is directed towards the center of the circular path

• Is directed away from the center of the circular path

A car goes around a curve of radius r at a constant speed v. What is the direction of the net force on the car?

• Toward the curve's center

• Away from the curve's center

• Toward the front of the car

• Toward the back of the car

Is it possible for an object moving with constant speed to accelerate?

• No. If the speed is constant then the acceleration equal to zero

• No. An object can accelerate only if there is net force acting on it

• Yes. Although the speed is constant, the direction of the velocity can be changing

• Yes. If the object is moving it can experience acceleration

A bob tied at the end of a string is made to execute a circular motion in the horizontal plane. Which of the following force provides the centripetal force?

• Weight of the bob

• Tension in the string and the weight of the bob

• Tension in the string

• Tension in the string minus the weight of the bob

The rate of change of angular displacement is called:

• Angular displacement

• Angular velocity

• Angular acceleration

• Torque

Unit of angular velocity in SI unit is:

• $Rad\ s^{-1}$

• $m\ s^{-1}$

• $\deg ree\ s^{-1}$

• $Revolution\ s^{-1}$

What is the unit for angular displacement?

• θ

• rad

• radish

• theta

What is the symbol for angular velocity?

• θ

• ψ

• ω

• Ω

What is the relation between v, r and ω?

• v = rω

• v = r/ω

• ω = vr

• ω = r/v