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Lowe Exam Review 4

Total questions: 55

Worksheet time: 3hrs 1mins

Name
Class
Date
1.

The forces that pulls a material apart is...

a)

compression

b)

tension

c)

torsion

d)

shear

2.

Which is the strongest shape used in engineering?

a)

Circle

b)

Triangle

c)

Square

d)

Rectangle

3.

The force of squeezing a material together is...

a)

compression

b)

tension

c)

torsion

d)

bending

4.
A slower particle has a lower energy than an identical, faster particle.
a)
True
b)
False
5.
The transfer of thermal energy between objects of different temperatures is called...
a)
temperature
b)
heat
c)
internal energy
d)
none of these
6.
It is possible to reach absolute zero
a)
true
b)
false
7.
Heat travels from the sun to the earth by the process of...
a)
conduction
b)
convection
c)
radiation
d)
insulation
8.
A substance with a high specific heat:
a)
Is always extremely hot.
b)
Requires a lot of energy to become hot.
c)
Is not heavy.
d)
Does not requires a lot of energy to become hot.
9.
Thermal energy always moves:
a)
From a high temperature object to a lower temperature object.
b)
From a lower temperature object to a higher temperature object.
c)
From an object with lower kinetic energy to an object with higher kinetic energy.
d)
From an object of higher mass to an object of lower mass.
10.
The second  law of thermodynamics states that entropy of a system  tends to ______________. 
a)
increase
b)
decrease
c)
stay constant
d)
fluctuate wildly
11.
The temperature of a glass of cold water will eventually...
a)
Match the temperature of the surrounding environment.
b)
Always be colder than the surrounding environment.
c)
Become warmer than the surrounding environment.
d)
Never change temperature.
12.
The first law of thermodynamics states that energy is
a)
created
b)
destroyed
c)
conserved
d)
created and destroyed
13.
Which law of thermodynamics states that absolute zero cannot be reached?
a)
1st
b)
2nd
c)
3rd
14.
The first law of thermodynamics states that the change in the internal energy of a system is equal to the difference in energy transferred to or from the system as heat and
a)
mass
b)
work done
c)
force
d)
pressure
15.
Which state of H2O  has the greatest entropy?
a)
Ice
b)
Water
c)
Vapor
16.
Which statement is true about the ENTROPY?
a)
Entropy refers to DISORDER, the unusable energy that escapes a system.
b)
Entropy refers to the balance of temperature among two or more systems.
c)
Entropy refers to the average kinetic energy of the molecules.
d)
Entropy refers to the inability to destroy or create energy. 
17.
As a system becomes more disordered, entropy
a)
remains the same
b)
increases
c)
decreases
d)
cannot be determined
18.

Which is an example of decreasing entropy in a closed system?

a)

Boiling water

b)

Freezing water

c)

Cells in a body coming together

d)

Ice melting

19.
Which would have more entropy?
a)
Frozen ice cream
b)
Liquid Ice cream
20.
A slower particle has a lower energy than an identical, faster particle.
a)
True
b)
False
21.
Two identical blocks of iron, one at 10 degrees C and the other at 20 degrees C, are put in contact. Suppose the cooler block cools to 5 degrees C and the warmer block warms to 25 degrees C. This would violate the
a)
first law of thermodynamics.
b)
second law of thermodynamics.
c)
both of the above
d)
none of the above
22.

The 1st law of Thermodynamics

a)

Energy can not be created or destroyed. It just changes forms.

b)

Energy can only be created by the sun

c)

Some energy is lost to the environment.

23.

2nd law of thermodynamics

a)

Every time energy changes form, some of it is lost to the environment

b)

Energy can't be created or destroyed

c)

All energy generates heat

24.

Conductor

a)

A material that thermal energy travels through easily

b)

A material that energy does NOT transfer through easily

c)

Energy that travels in the form of electromagnetic waves

25.

Temperature is ...

a)

the measure of the average kinetic energy of the molecules of an object

b)

The amount of thermal energy it takes to raise one gram of a substance by one degree Celsius.

c)

An object’s internal energy

26.

Conduction

a)

The transfer of thermal energy through solids

b)

The transfer of thermal energy through liquids and gases

c)

The transfer of thermal energy as electromagnetic waves

27.

Convection

a)

The transfer of thermal energy through liquids and gases

b)

The transfer of thermal energy through solids

c)

The transfer of thermal energy as electromagnetic waves

28.

Radiation

a)

The transfer of thermal energy as electromagnetic waves

b)

The transfer of thermal energy through solids

c)

The transfer of thermal energy through liquids and gases

29.
How much work is produced when 350 N is used to move a car 5 m (W=Fd)?
a)
70 J
b)
1750 J
c)
355 J
d)
175 J
30.

What is effort (input) force?

a)

the force one exerts on a machine

b)

the force which an effort force must overcome in order to do work on an object via a simple machine.

c)

the force the machine exerts on a object

d)

the output work times the input distance

31.
If the weight of the block is 10N, how much force does one have to apply to lift it using this pulley (MA=2)?
a)
2N
b)
5N
c)
10N
d)
15N
32.

A box of weight W is lifted by a force F using a lever as shown below.

What is the mechanical advantage of the lever (MA=Input Distance/Output Distance)?

a)

0.5

b)

2

c)

3

d)

6

33.

Using a lever, Joe is able to lift a 10,000 N car off of the ground with a force of 1000 N. What is the mechanical advantage of the lever (MA=Output Force/Input Force)?

a)

1

b)

10

c)

100

d)

1000

34.
if a load of a lever is 100 newtons and the force you apply is 20 newtons, what is your mechanical advantage?
a)
120 N
b)
5 N
c)
2000 N
d)
80 N
35.

The mechanical advantage of this inclined plane is...(MA=Resistance Force/Effort Force)

a)

2.4

b)

3.4

c)

4.4

36.
The amount by which a machine multiplies input force is known as the 
a)
work.
b)
power.
c)
output force.
d)
mechanical advantage.
37.
Mechanical advantage is a measure of how much a machine multiplies the input
a)
efficiency.
b)
force.
c)
power.
d)
work.
38.
Jeff is a landscaping contractor and lifts a rock weighing 600 pounds by wedging a board under the rock. Jeff weighs 150 pounds and puts all of his weight on the lever. How much mechanical advantage did the lever provide to Jeff in lifting the rock?
a)
0
b)
2
c)
4
d)
8
39.
A 16 N force is applied to an object and 96 J of work is done. How far was the object moved?
a)
6 m
b)
16 m 
c)
80 m 
d)
1536 m 
40.

How much effort would it take to lift Lever A?

a)

60 N

b)

50N

c)

40 N

d)

30 N

41.
How much work is produced when 350 N is used to move a car 5 m (W=Fd)?
a)
70 J
b)
1750 J
c)
355 J
d)
175 J
42.
How is work defined?
a)
the amount of energy 
b)
the transfer of force over a distance
c)
rate of work in a given time
d)
the change in distance in a given time
43.
What is the equation for mechanical advantage?
a)
MA=input force*output force
b)
MA=output force/input force
c)
MA=input force/output force
d)
MA= output force - input force
44.

A simple gear train is composed of three gears. Gear A is the driver and has 60 teeth, gear B has 40 teeth, and gear c has 15 teeth. If the output at gear C is 300 RPM, what is the input torque at gear A?

a)

600 RPM

b)

1200 RPM

c)

75 RPM

d)

2400 RPM

45.

If the small gear is driving the large gear, what is happening to the torque (TRACCION)?

a)

Torque is increasing

b)

Torque is decreasing

c)

Torque remains constant

d)

Not enough information to answer the question

46.

Which gear train would you use to apply the force necessary to ride up a hill?

a)

A

b)

B

47.

If a pulley system has a mechanical advantage of 4, what does that mean?

a)

This means that it is 4 times easier to lift this load.

b)

This means you only need a quarter of the effort to lift the load.

c)

For example, if you lifted 100 kg, it would only take 25 kg of effort.

d)

All of the above

48.
A 10 Newton effort force is required to lift a 10 kg box just off the ground. What is the effort required to lift the box off the ground using a 3m long lever? [The fulcrum is placed 0.5m from the box.]
a)
0.5 N
b)
2.0 N
c)
5.0 N
d)
8.0 N
49.

This 2000 N weight is raised 1 meter by pulling 4 meters of rope. What force was required to pull the rope?
a)
500 N
b)
1000 N
c)
2000 N
d)
8000 N
50.
A lever and fulcrum are used to lift a fallen tree, which has a weight of 480 N. If the lever has a mechanical advantage of 5.5, what is the input force that will begin lifting the tree off the ground?
a)
5.5 N
b)
40.7 N
c)
87.3 N
d)
2640 N
51.

TYPE OF LEVER?

a)

1

b)

2

c)

3

52.
The efficiency of a machine can be increased by reducing __________________________. 
a)
effort
b)
resistance friction
c)
fulcrum
d)
friction
53.
What is the unit for mass?
a)
Kilogram (Kg)
b)
Newton (N)
c)
Joule (J)
d)
Watt (W)
54.
What is the measure of how much input work is changed into output work?
a)
resistance force
b)
efficiency
c)
mechanical advantage
d)
effort force
55.
What is the unit of measurement for Power?
a)
Joules
b)
Newtons
c)
Watts
d)
Meters

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