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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
simple machinethe object must move some distance as a result of a force.
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
screw
B
pulley
C
inclined plane
D
lever
3) The threads of this simple manchine, act like an inclined plane to increase the distance over which input force is exterted.
A
screw
B
gear
C
lever
D
pulley
4) How many classes of levers are there?
A
3
B
2
C
4
D
5
5) A rigid bar that is free to pivot, or rotate.
A
wedge
B
lever
C
gear
D
pulley
6) The fixed point that a lever pivots around.
A
center of gravity
B
fulcrum
C
force
D
bar
7) A simple machine made of a grooved wheel with a rope wrapped around it.
A
pulley
B
gear
C
lever
D
fulcrum
8) Two connected objects that rotate around an axis.
A
gear
B
lever
C
wheel and axle
D
pulley
9) An example of a wheel and axle.
A
wheel barrow
B
flag pole
C
screwdriver
D
can opener
10) A machine that combines two or more simple machines.
A
crane
B
compound
C
pulley
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
30 j
C
200 w
D
200 j
12) How can a hockey stick be considered a machine?
A
It indreases force.
B
It multiplies distance.
C
It changes direction
*select an answer for all questions
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