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Simple Machines
Test Description: Simple machines
Instructions: Answer all questions to get your test result.
1) For work to be done ona n object,
A
simple machinethe object must move some distance as a result of a force.
B
some force need only be wxerted on the object.
C
the object must move, whether or not a force is exerted on it.
2) Flat, sloped surface, allows you to exert input force over a longer distance.
A
inclined plane
B
screw
C
lever
D
pulley
3) The threads of this simple manchine, act like an inclined plane to increase the distance over which input force is exterted.
A
lever
B
screw
C
gear
D
pulley
4) How many classes of levers are there?
A
5
B
3
C
4
D
2
5) A rigid bar that is free to pivot, or rotate.
A
wedge
B
pulley
C
gear
D
lever
6) The fixed point that a lever pivots around.
A
bar
B
center of gravity
C
force
D
fulcrum
7) A simple machine made of a grooved wheel with a rope wrapped around it.
A
lever
B
gear
C
pulley
D
fulcrum
8) Two connected objects that rotate around an axis.
A
gear
B
pulley
C
lever
D
wheel and axle
9) An example of a wheel and axle.
A
can opener
B
screwdriver
C
flag pole
D
wheel barrow
10) A machine that combines two or more simple machines.
A
compound
B
wheel and axle
C
crane
D
pulley
11) If you exert a force of 20 N to push a desk 10 m, how much work do you do on the desk?
A
200 j
B
30 j
C
10 w
D
200 w
12) How can a hockey stick be considered a machine?
A
It changes direction
B
It indreases force.
C
It multiplies distance.
*select an answer for all questions
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