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Torque, Work, Motion, Forces

Total questions: 23

Worksheet time: 1hrs 13mins

Name
Class
Date
1.
The Earth pulls downward on a pingpong ball with a force  of 1N. If this is the "action" force, what is the "reaction" force?
a)
The ground exerts a force of 1N on the ping pong ball
b)
The ping pong ball exerts a force of 1 N on the Earth
c)
The ping pong ball pushes down on the earth with a force of 1N
d)
The is no reaction force when a gravitational force is involved
2.

Camille launches has a catapult that changes the velocity of a ball (m= 2 kg) from 0 to 10 m/s in one sec. What is the average force that is exerted on the ball during launch?

a)

20 N

b)

5 N

c)

8 N

d)

0.2 N

3.

If there is no friction, then the acceleration would be equal to

a)

mg

b)

sin(θ)mg

c)

g

d)

sin(θ)g

4.
A 80 kg skydiver is free falling at a constant velocity of 19 m/s. What is the net (total) force acting on her?
a)
1,520 N
b)
0 N
c)
4.21 N
d)
Not enough information to answer
5.

Two children are sitting on a see-saw, as shown. Calculate the distance the 500-N child should sit from the fulcrum in the center (pivot) of the lever to balance the see-saw.

a)

1.8 m

b)

3m

c)

5 m

d)

1 m

6.

If the torque required to loosen a nut on the wheel of a car has a magnitude of 60.0 N• m, what minimum perpendicular force must be exerted by a mechanic at the end of a 0.45 m wrench to loosen the nut?

a)

.666 Nm

b)

133.3 N

c)

66.7 N

d)

13.3 Nm

7.

If the torque required to loosen a nut on the wheel of a car has a magnitude of 60.0 N• m, for a 0.45 m wrench to loosen the nut, how much torque would be needed if a pipe extended the length of the wrench to 0.90 m?

a)

60 Nm

b)

30 Nm

c)

120 Nm

d)

54 Nm

8.
A wrench is used to tighten a nut. A 15N perpendicular force is applied 50cm away from the axis of rotation, and moves a distance of 10 cm as it turns. What is the torque applied to the wrench?
a)
7.5 Nm
b)
1.5 Nm
c)
750 Nm
d)
150 Nm
9.
A 800N man is playing on a seesaw with son who has a weight of 200N. If the child is sitting 3 meters away, how far will the man have to sit to balance the seesaw?
a)
0.75m
b)
3m
c)
1.5m
d)
1m
10.
What is the Unit for Torque
a)
Nm
b)
N
c)
W
d)
J
11.
Does a bridge anchored resting on two pillars have any torque?
a)
No, it isn't moving
b)
Yes, but it is at equilibrium
c)
Yes, but it will soon break because of the torque
d)
No, Bridges can't have torque
12.
In the diagram above, two masses, one with mass m, the other with mass M = 2m are resting on a uniform plank of length L that pivots at its midpoint. If the mass m is at the far end of the plank, how far away from the pivot should the mass M be to balance the plank in a horizontal position shown?
a)
L/2
b)
L/3
c)
L/4
d)
L/6
13.
When an object is experiencing a net torque
a)
it is in dynamic equilibrium.
b)
it is in static equilibrium.
c)
it is rotating.
d)
it is translating.
14.
A construction worker is worried about applying too much torque to a bolt using his wrench.  What could he do to reduce his torque on the bolt?
a)
Increase the length of the wrench
b)
Increase the force on wrench
c)
Reduce the length of the wrench
d)
Reduce the friction between the bolt and wrench
15.

What is the symbol for displacement?

a)

d

b)

s

c)

u

d)

v

16.
 The graph shows Ashley riding her bike to Maria's house. 
What is occurring from point A to point B?
a)
they are traveling at a constant speed
b)
they are decreasing in speed
c)
they stopped to take a break
17.

Renatta Gass is out with her friends. Misfortune occurs and Renatta and her friends find themselves getting a workout. They apply a cumulative force of 1080 N to push the car 218 m to the nearest fuel station. Determine the work done on the car.

a)

2.35 x 105 J

b)

2.05 x 105 J

c)

1.35 x 105 J

d)

3.25 x 105 J

18.

During the Powerhouse lab, Jerome runs up the stairs, elevating his 102 kg body a vertical distance of 2.29 meters in a time of 1.32 seconds at a constant speed. Determine the work done by Jerome in climbing the stair case.

a)

2.30 x 103 J

b)

2.35 x 105 J

c)

2.42 x 103 J

d)

2.6 x 103 J

19.

If Jay Loppy pushes his van 20 meters how much work is done?

a)

2,000J

b)

40,000J

c)

10,000J

d)

800,000J

20.

An aircraft, initially stationary on a runway, takes off with a speed of 85kmh–1 in a distance of no

more than 1.20km.

What is the minimum constant acceleration necessary for the aircraft?

a)

0.23ms–2

b)

0.46ms–2

c)

3.0 ms–2

d)

6.0 ms–2

21.

A train travels 6 meters in the first second of travel, 6 meters again during the second second of travel, 6 meters again during the third second. What's the train's acceleration ?

a)

0 m/s2

b)

6 m/s2

c)

12 m/s2

d)

18 m/s2

22.
A car is traveling at 21.0 m/s. It slows to a stop at a constant rate over 5.00 s. How far does the car travel during those 5.00 seconds before it stops? 
a)
4.20 m
b)
52.5 m
c)
105 m
d)
158 m
23.
An object with an initial velocity of 3.50 m/s moves east along a straight and level path. The object then undergoes a constant acceleration of 1.80 m/s2 east for a period of 5.00 s. How far does the object move while it is accelerating?
a)
6.30 m
b)
17.5 m
c)
27.2 m
d)
40.0 m

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