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Angular Kinematics & Uniform Circular Motion

Total questions: 21

Worksheet time: 11mins

Name
Class
Date
1.

The "centrifugal force" describes what actual physics phenomena?

a)

Mass

b)

Weight

c)

Rotational Motion

d)

Inertia

2.

What does the term "centripetal" mean?

a)

Center-fleeing

b)

Center-seeking

c)

Rotation

d)

Circular

3.

Centripetal force isn't a new force, but an existing force. What other 2 forces in the choices below can the centripetal force be?

a)

Weight

b)

Friction

c)

Tension

d)

Air Resistance

e)

Normal

4.

Why do clothes in a washing machine fling outward along the edge of the drum?

a)

Centripetal force isn't enough to pull them into the center of the drum, so the clothes are flung outward toward the edge of the drum due to inertia

b)

Gravity pulls the clothes to the outside of the drum

c)

Centripetal force is enough to pull them into the center of the drum, pushing them outward toward the edge of the drum

d)

The weight of the clothes is greater because they are weight, so the clothes are pulled toward the center

5.

When driving around a curve, why do you lean the opposite direction of a turn?

a)

Gravity

b)

Weight

c)

Inertia

d)

Friction

6.

What does the term "tangential" mean?

a)

Moving Forward

b)

Moving in a Circle

c)

Moving in a straight line

d)

Moving Around

7.

In uniform circular motion, there is a

a)

Constant Speed

b)

Constant Angular Velocity

c)

Zero Acceleration

d)

Net Tangential Acceleration

8.

If the centripetal force on a particle in uniform circular motion is decreased,

a)

The tangential speed remains constant

b)

The tangential speed will increase

c)

The radius of the circular path will decrease

d)

The tangential speed will decrease and/or the radius will increase

9.

The angular acceleration in circular motion

a)

Equal in magnitude to the tangential acceleration divided by the radius

b)

Increases the angular velocity in the same direction

c)

Has units of rads2 (s2)\frac{rad}{s^2}\ \left(s^{-2}\right)  

d)

All of the above

10.

Is there an example when a car can experience centripetal and angular acceleration?

a)

No; both accelerations cannot act at the same time

b)

Yes; when the car is moving in a straight line

c)

No; the car only experiences centripetal acceleration around a curve

d)

Yes; when a car is changing its speed around a curve

11.

When an object rotates in circular motion, it has

a)

Only tangential velocity

b)

Only angular velocity

c)

Both tangential and angular velocity

d)

Neither tangential or angular velocity

12.

The driver of a truck sets the cruise control and ties the steering wheel so that the truck travels at a uniform speed of 18 m/s in a circle with a diameter of 150 m. Through what angular displacement does the car move in 7.00 min?

a)

100.8 rad

b)

0.24 rad

c)

1.69 rad

d)

50.4 rad

13.

If the angular displacement of a truck is 101 radians and the radius about the central axis is 75 m, what arc distance does the truck complete?

a)

7,575 m

b)

1.35 m

c)

0.74 m

d)

471.2 m

14.

A car on a circular track with a radius of 0.47 km accelerates from rest with a constant angular acceleration of magnitude 6.5 x 103 rads26.5\ x\ 10^{-3}\ \frac{rad}{s^2}  . How long does it take the car to make one lap around the track?

a)

44 s

b)

1,933 s

c)

31 s

d)

967 s

15.

What is the tangential acceleration of a truck with an angular acceleration of 6.5 x 103 rads26.5\ x\ 10^{-3}\ \frac{rad}{s^2}   going around a circular track with a radius of 0.47 km?

a)

3.06 ms2\frac{m}{s^2}  

b)

3.06 x 103 ms23.06\ x\ 10^{-3}\ \frac{m}{s^2}  

c)

1.38 x 102 ms21.38\ x\ 10^{-2}\ \frac{m}{s^2}  

d)

1.38 x 105 ms21.38\ x\ 10^{-5}\ \frac{m}{s^2}  

16.

A CD disc rotates at a low speed at 10,000 rpm. When the disc rotates at a higher speed, the rotation increases uniformly to 12,500 rpm in 2.5 s. What is the magnitude of the angular acceleration of the CD disc?

a)

105 rads2105\ \frac{rad}{s^2}  

b)

1.2 rads21.2\ \frac{rad}{s^2}  

c)

1,000 rads21,000\ \frac{rad}{s^2}  

d)

524 rads2524\ \frac{rad}{s^2}  

17.

A CD disc has an angular acceleration of 105 rads2105\ \frac{rad}{s^2}   when it increases from a low speed of 10,000 rpm to a high speed of 12,500 rpm. What is the angular displacement the disc goes through while it's accelerating?

a)

2,939 rad

b)

1.25 rad

c)

5,879 rad

d)

308, 636 rad

18.

What is the period and frequency of revolution of a fan blade that spins at 450 rpm?

a)

T = 0.13 s

f = 7.5 Hz

b)

T= 7.5 s

f = 0.13 Hz

c)

T= 0.014 s

f = 74.02 Hz

d)

T= 74.02 s

f= 0.014 Hz

19.

A car with a constant speed of 72 kmhr\frac{km}{hr}   enters a circular flat curve with a radius of curvature of 0.150 km. What is the coefficient of friction that the tires must have in order to safely round a curve?

a)

0.27

b)

0.014

c)

2.67

d)

0.13

20.

A wheel of radius 2.25 m rotates at a uniform speed. If a point on the rim of the wheel has a centripetal acceleration of 3.5 ms2\frac{m}{s^2}  , What is the tangential velocity at this point?

a)

2.8 m/s

b)

7.9 m/s

c)

1.6 m/s

d)

1.2 m/s

21.

A wheel of radius 2.25 m rotates at a uniform speed. If a point on the rim of the wheel has a centripetal acceleration of 3.5 ms2\frac{m}{s^2}  , what is the angular velocity at this point?

a)

1.2 rad/s

b)

1.6 rad/s

c)

2.8 rad/s

d)

7.9 rad/s