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8th Grade First Semester Exam Review Part 2
Test Description: This is a review for a small portion of the final exam.
Instructions: Answer all questions to get your test result.
1) A ramp is an example of a simple machine called a(n)
A
lever.
B
pulley.
C
wedge.
D
inclined plane.
2) In order to do work on an object, the force you exert must be
A
quick and deliberate.
B
the maximum amount of force you are able to exert.
C
in a direction opposite to Earth's gravitational force.
D
in the same direction as the object's motion.
3) Work is measured in
A
watts.
B
meters.
C
newtons.
D
joules.
4) Pulling down on a rope to hoist a sail on a sailboat is an example of a machine
A
multiplying the force you exert.
B
reducing friction.
C
changing the direction over which a force is exerted.
D
multiplying the distance over which a force is exerted.
5) The mechanical advantage of a machine is the number of times a machine increases
A
the force exerted on the machine.
B
the change in direction.
C
the distance an object is moved.
D
the amount of friction.
6) An ideal machine would have an efficiency of
A
1 %.
B
100%.
C
50%.
D
10%.
7) The fixed point that a lever pivots around is called the
A
fulcrum.
B
pulley.
C
gear.
D
axle.
8) Which of these is an example of a third-class lever?
A
nutcracker.
B
fishing pole
C
scissors.
D
pliers.
9) The power of a light bulb the converts electrical energy at a rate of 100 joules per second is
A
50 watts.
B
40 watts.
C
200 watts.
D
100 watts.
10) What do machines do?
A
decrease the amount of work that is done
B
eliminate friction
C
makes work easier
D
increase the amount of work that is done
*select an answer for all questions
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