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Work And Machines
Test Description: Study to prepare for Friday's test
Instructions: Answer all questions to get your test result.
1) The unit of work is called a
A
Joule-meter
B
Newton
C
Gram
D
Joule
2) An Ideal machine has an efficiency of
A
0%
B
100%
C
50%
D
75%
3) If you do 2,000 J of work using a hammer. The hammer does 1,500 J of work on the nail. What is the efficiency of the hammer? (Efficiency = output work / input work x 100%)
A
75%
B
133%
C
300%
D
21%
4) A machine can make work easier by
A
dividing the force needed to accomplish a task
B
decreasing the mechanical advantage
C
changing the direction of force needed to accomplish a task
D
decreasing the efficiency
5) An ax, zipper, and a front tooth are examples of a simple machine called a
A
pulley
B
wedge
C
screw
D
lever
6) You divide the radius of a wheel by the radius of an axle. What are you calculating?
A
The actual mechanical advantage of a screw
B
The efficiency of a wheel and axle
C
the ideal mechanical advantage of the pulley
D
The ideal mechanical advantage of a wheel and axle
7) A car's steering wheel is an example of a simple machine called a
A
inclined plane
B
wheel and axle
C
lever
D
screw
8) The fixed point that a lever rotates around is called a(n)
A
input force
B
fulcrum
C
output force
D
wedge
9) Compound machines are
A
machines that used to make mixtures
B
machines that use wheels
C
machines that use gears
D
combinations of simple machines
10) When you bend your arm at the elbow, the fulcrum is at your
A
elbow
B
elbow
C
bicep
D
wrist
11) In order to do work on an object, the object must ____________________ as a result of the force
A
ideal mechanical advantage
B
tendons
C
move some distance
D
axle
12) A machine's _____________________ is the number of times a force exerted on a machine is multiplied by the machine.
A
tendons
B
mechanical advantage
C
ideal mechanical advantage
D
axle
13) In a screwdriver, the handle is the wheel and the shaft is the _____________________
A
distance
B
mechanical advantage
C
tendon
D
axle
14) Muscles are attached to bones by ______________________
A
axle
B
ideal mechanical advantage
C
mechanical advantage
D
tendons
15) The more EFFICIENT a machine is, the closer the ACTUAL mechanical advantage is the _____________________
A
tendons
B
axle
C
ideal mechanical advantage
D
mechanical advantage
16) A machine DECREASES the amount of work you do
A
false
B
true
17) An inclined plane wrapped around a central cylinder is a LEVER
A
True
B
False
18) A rope wrapped around a grooved wheel is a PULLEY.
A
True
B
False
19) A single fixed pulley, such as a flagpole, changes the AMOUNT of the input force
A
False
B
True
20) When you bite into a sandwich, your front teeth act as WEDGES.
A
False
B
True
*select an answer for all questions
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