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Work And Machines
Test Description: Work and Machines
Instructions: Answer all questions to get your test result.
1) When you exert a force on an object that causes the object to move.
A
power
B
machine
C
work
D
watt
2) For work to happen, when a force is applied:
A
the object should not move.
B
the object must go the opposite direction as the force.
C
the forces should be balanced.
D
the object must go the same direction as the force.
3) The joule measures:
A
watts.
B
work.
C
power.
D
forces.
4) Work depends on:
A
speed and direction.
B
mass and distance.
C
force and roughness.
D
force and distance.
5) The rate that energy is transferred.
A
joules
B
work
C
power
D
machines
6) Power is measured in:
A
motion
B
watts
C
joules
D
forces
7) A device that makes work easier by changing the size or direction of the force.
A
work
B
machine
C
power
D
force
8) The work you put into a machine.
A
work output
B
machining
C
work input
D
forces
9) The work a machine puts out.
A
work input
B
work output
C
power
D
friction
10) The number of times the machine multiplies force.
A
force input
B
mechanical advantage
C
power advantage
D
simple machine
11) A simple machine with a bar that pivots at a fixed point, called a fulcrum.
A
pulley
B
screw
C
lever
D
inclined plane
12) A wheelbarrow is an example of a______class lever.
A
second
B
fourth
C
third
D
first
13) Scissors would be an example of a _______ class lever.
A
fourth
B
third
C
second
D
first
14) A teeter-totter would be an example of a _______ class lever.
A
second
B
fourth
C
first
D
third
15) Your forearm would be an example of a _______ class lever.
A
first
B
fourth
C
second
D
third
16) A simple machine that has a grooved wheel that holds a rope or cable.
A
pulley
B
lever
C
wedge
D
screw
17) Block and tackle pulleys are very efficient because of the:
A
extra wheels and rope segments.
B
magic pulley gnomes
C
extra force that is required.
D
fewer wheels and rope segments.
18) A simple machine with two circular objects of different sizes.
A
screw
B
lever
C
pulley
D
wheel and axle
19) Turning the wheel on a wheel and axle results in a mechanical advantage because:
A
the wheel radius is smaller than the axle radius.
B
magic wheel gnomes.
C
the wheel needs more force.
D
the wheel radius is larger than the axle radius.
20) The greater the length is in relation to the height of an inclined plane, the___________the mechanical advantage is.
A
greater
B
less force
C
more equal
D
smaller
*select an answer for all questions
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