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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
some force need only be wxerted on the object.
B
the object must move, whether or not a force is exerted on it.
C
simple machinethe object must move some distance as a result of a force.
2) Flat, sloped surface, allows you to exert input force over a longer distance.
A
pulley
B
inclined plane
C
lever
D
screw
3) The threads of this simple manchine, act like an inclined plane to increase the distance over which input force is exterted.
A
pulley
B
lever
C
gear
D
screw
4) How many classes of levers are there?
A
3
B
4
C
5
D
2
5) A rigid bar that is free to pivot, or rotate.
A
gear
B
wedge
C
lever
D
pulley
6) The fixed point that a lever pivots around.
A
bar
B
center of gravity
C
fulcrum
D
force
7) A simple machine made of a grooved wheel with a rope wrapped around it.
A
pulley
B
lever
C
fulcrum
D
gear
8) Two connected objects that rotate around an axis.
A
pulley
B
wheel and axle
C
gear
D
lever
9) An example of a wheel and axle.
A
screwdriver
B
can opener
C
wheel barrow
D
flag pole
10) A machine that combines two or more simple machines.
A
compound
B
pulley
C
crane
D
wheel and axle
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
10 w
B
200 w
C
30 j
D
200 j
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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