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WorksheetsHonors Physics Unit 8: Rotational Equilibrium and Dynamics
Total questions: 27
Worksheet time: 1hrs 20mins
Name
Class
Date
1.
Calculate the torque produced by 75- N perpendicular force at the end of a 0.20 m long wrench.
a)
15 Nm
b)
1.5 Nm
c)
15.0 Nm
d)
16 Nm
2.
Calculate the torque produced when 75.0 N force when a pipe extends the length of the wrench to 0.500 m.
a)
38 Nm
b)
37.5 Nm
c)
40 Nm
d)
36.5 Nm
3.
If the torque required to loosen a nut on the wheel of a car has a magnitude of 40.0 Nm, what is the minimum force must be exerted by the mechanic at the end of a 0.300 m wrench to loosen the nut?
a)
145 N
b)
175 N
c)
133 N
d)
125 N
4.
The easiest way to open a heavy door is by applying the force
a)
Near the hinges
b)
In the middle of the door
c)
At the edge of the door far from the hinges
d)
At the top of the door
5.
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
6.
What is the Unit for Torque
a)
Nm
b)
N
c)
W
d)
J
7.
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
8.
Torque is the product of a force exerted on an object times the lever arm.
a)
True
b)
False
9.
What force does not cause any torque?
a)
Force perpendicular to the fulcrum.
b)
Force horizontal to the planck.
c)
Force slightly off center of the fulcrum
d)
Forces at a 45 degree angle to the fulcrum, and not on the fulcrum
10.
A seesaw with mass x is perfectly balanced with a fulcrum in the center. If mass x changes uniformly does the net torque change?
a)
Yes, because the Gravitational force increases with more mass, and torque is related to Force
b)
No, because the net torque is still zero despite increases in one of the individual components.
c)
No, because it is balanced that means net torque is zero, a uniform increase in weight keeps it balanced keeping net torque at zero
d)
Yes, any increase in weight will increase torque
11.
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
12.
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.
13.
You apply force to a wrench to tighten a bolt. The wrench breaks in half. Select the best answer for what happens next. Assume the force applied remains constant.
a)
The torque is now half of what it was, because torque and distance are inversely proportional
b)
The torque is now half of what it was, because torque and distance are directly proportional
c)
The torque is now double of what it was, because torque and distance are inversely proportional
d)
The torque is now double of what it was, because torque and distance are directly proportional
14.
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 45.0 cm wrench to loosen the nut?
a)
.666 Nm
b)
133.3 N
c)
66.7 N
d)
13.3 Nm
15.
If the torque required to loosen a nut on the wheel of a car has a magnitude of 85.0 N• m, what minimum 65 degrees from the perpendicular force must be exerted by a mechanic at the end of a 22.0 cm wrench to loosen the nut?
a)
426.3 N
b)
2.314 N
c)
35 N
d)
3500 N
16.
What is the distance the masses on the right of the fulcrum need to be to balance with the two masses on the left?
a)
.65 m
b)
.56 m
c)
.79 m
d)
.39 m
17.
A beam with a length of L is lifted from one end with a force of F1. If the beam doubles in length but contains the same mass, what will the force required to lift it be in terms of F1?
a)
F1
b)
1/2 F1
c)
2 F1
d)
1/4 F1
18.
Is torque independent of the location of the origin?
a)
Yes, always.
b)
Yes, as long as the origin is either in the center or on one end.
c)
No, you always need to specify the origin.
19.
Suppose you are designing an engineless car for a downhill coasting race. What type of wheels would be the best?
a)
Solid disks.
b)
Hoops.
c)
Hollow cylinders.
d)
Diamond encrusted triangles.
20.
Which is not a type of simple machine?
a)
spring
b)
screw
c)
pulley
d)
wedge
21.
What type of simple machine is found on the cap of a pickle jar?
a)
lever
b)
inclined plane
c)
pulley
d)
screw
22.
What type of simple machine is found on the floor of a bathtub?
a)
screw
b)
inclined plane
c)
wedge
d)
pulley
23.
A screw is made up of _____ wrapped around a post or rod.
a)
threads
b)
springs
c)
treads
d)
strings
24.
Which is an example of someone using a simple machine to do work?
a)
a boy runs across a football field
b)
a banker counts money
c)
a mother pushes a stroller up a ramp
d)
a girl eats a sandwich
25.
Which is a characteristic of a simple machine?
a)
They run on electricity.
b)
They take a long time to make.
c)
They have few or no moving parts.
d)
They are not very large.
26.
Which type of simple machine would be found on the bottom of a wagon??
a)
a pulley
b)
a screw
c)
a wedge
d)
a wheel and axle
27.
What two parts might make a pulley?
a)
wheel and axle
b)
wheel and wire
c)
wheel and screw
d)
wheel and fulcrum
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