Free Printable Chapter 6: Circular Motion

1.

Consider a particle moving with constant speed such that its acceleration of constant magnitude is always perpendicular to its velocity. What can we say about the movement of this particle?

a)

It is moving in a straight line.

b)

It is moving in a circle

c)

It is moving in a parabola

d)

It is moving with no direction

2.

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

a)

In the same direction as the velocity vector

b)

In the opposite direction of the velocity vector

c)

Is directed towards the center of the circular path

d)

Is directed away from the center of the circular path

3.

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?

a)

Toward the curve's center

b)

Away from the curve's center

c)

Toward the front of the car

d)

Toward the back of the car

4.

A car goes around a curve of radius r at a constant speed v. Then it goes around a curve of radius 2r at speed 2v. What is the centripetal force on the car as it goes around the second second curve, compared to the first?

a)

Four times as big

b)

Twice as big

c)

One-half as big

d)

One-forth as big

5.

Is it possible for an object moving around a circular path to have both centripetal and tangential acceleration?

a)

No, because then the path would not be a circle

b)

No, an object can only have one or the other at any given time

c)

Yes, this is possible if the speed is constant

d)

Yes, this is possible if the speed is changing

6.

For an object to move in uniform circular motion, it must move with:

a)

Constant speed

b)

Constant velocity

c)

Constant direction

d)

Constant momentum

7.

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

a)

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

b)

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

c)

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

d)

Yes. If the object is moving it can experience acceleration

8.

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?

a)

Weight of the bob

b)

Tension in the string and the weight of the bob

c)

Tension in the string

d)

Tension in the string minus the weight of the bob

9.

A small mass is whirled in a horizontal circle at the end of a string of length l on a smooth horizontal surface. The tension in the string is T. What is the tension in the string when the same mass is whirled at twice the speed

a)

$\frac{T}{2}$

b)

$T$

c)

$2T$

d)

$4T$

10.

1 revolution:

a)

$57\degree$

b)

$90\degree$

c)

$180\degree$

d)

$360\degree$

11.

The rate of change of angular displacement is called:

a)

Angular displacement

b)

Angular velocity

c)

Angular acceleration

d)

Torque

12.

Revolution/minute is the unit for

a)

Angular displacement

b)

Angular acceleration

c)

Angular velocity

d)

Time

13.

A particle is moving in a circle with constant speed. The direction of centripetal force will be:

a)

Along the tangent

b)

Along radius towards center

c)

Along radius away from center

d)

Changing with motion

14.

The period of a circular motion is given by:

a)

$T\ =\ r\ v$

b)

$T\ =\ \omega w$

c)

$T\ =\ 2\pi\omega$

d)

$T\ =\ \frac{2\pi}{\omega}$

15.

The direction of linear velocity of body moving in a circle is:

a)

Along the axis of rotation

b)

Along the tangent

c)

Directed towards the center

d)

Directed away from the center

16.

When a body is whirled in a horizontal circle by means of a string the centripetal force is supplied by:

a)

Mass of a body

b)

Velocity of body

c)

Tension in the string

d)

None of these

17.

When a body moves in a circle of radius, r with linear speed, v its centripetal force is.

a)

$\frac{mv}{r^2}$

b)

$\frac{mv}{r}$

c)

$\frac{mv^2}{r}$

d)

$\frac{mv^2}{r^2}$

18.

The magnitude of the centripetal force on a mass m moving with angular speed 𝜔 in a circle of radius r is

a)

$mr^2\omega$

b)

$\frac{mr^2}{\omega}$

c)

$mr\omega$

d)

$mr\omega^2$

19.

Unit of angular velocity in SI unit is:

a)

$Rad\ s^{-1}$

b)

$m\ s^{-1}$

c)

$\deg ree\ s^{-1}$

d)

$Revolution\ s^{-1}$

20.

Centripetal force performs

a)

Maximum work

b)

Minimum work

c)

Negative work

d)

No work

21.

A man of weight W is standing on an elevator which is ascending with an acceleration a. The apparent weight of the man is:

a)

$mg$

b)

$mg\ -\ ma$

c)

$mg\ +\ ma$

d)

$ma\ -\ mg$

22.

A man of weight W is standing on an elevator which is descending with an acceleration a. The apparent weight of the man is:

a)

$mg$

b)

$mg\ -\ ma$

c)

$mg\ +\ ma$

d)

$ma\ -\ mg$

23.

What type of acceleration does an object moving with constant speed in a circular path experience?

a)

Free fall

b)

Constant acceleration

c)

Linear acceleration

d)

Centripetal acceleration

24.

What force is needed to make an object move in a circle?

a)

Kinetic friction

b)

Static friction

c)

Centripetal force

d)

Weight

25.

When an object experiences uniform circular motion, the direction of the net force is

a)

In the same direction as the motion of the object.

b)

In the opposite direction of the motion of the object.

c)

Is directed toward the center of the circular path

d)

Is directed away from the center of the circular path.

26.

A car goes around a curve of radius r at a constant speed v. Then it goes around a curve of radius 2r at speed 2v. What is the centripetal force on the car as it goes around the second curve, compared to the first?

a)

Four times as big

b)

Twice as big

c)

One-half as big

d)

One-fourth as big

27.

One revolution is the same as:

a)

$1\ \ \ rad$

b)

$2\pi\ \ rad$

c)

$\frac{\pi}{2}\ \ rad$

d)

$\pi\ \ \ rad$

28.

One revolution per minute is about:

a)

$0.0524\ rad\ s^{-1}$

b)

$0.95\ rad\ s^{-1}$

c)

$1.57\ rad\ s^{-1}$

d)

$0.105\ rad\ s^{-1}$

29.

If the radius of curvature of a corner is r, the maximum speed of a car rounding the corner without sliding is directly proportional to:

a)

$\frac{1}{r^2}$

b)

$\frac{1}{\sqrt{r}}$

c)

$\sqrt{r}$

d)

$r^2$

30.

The string makes an angle to the vertical and the tension of the string is T. Which of the following represent the centripetal force in the horizontal circular motion

a)

$T\ \sin\theta$

b)

$T\ \cos\theta$

c)

$T\ \sin\theta\ +\ \frac{mv^2}{r}$

d)

$T\ \cos\theta\ +\frac{mv^2}{r}$

Chapter 6: Circular Motion

Total questions: 30

Worksheet time: 3600secs

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