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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
wedge.
B
inclined plane.
C
pulley.
D
lever.
2) In order to do work on an object, the force you exert must be
A
in a direction opposite to Earth's gravitational force.
B
the maximum amount of force you are able to exert.
C
quick and deliberate.
D
in the same direction as the object's motion.
3) Work is measured in
A
joules.
B
newtons.
C
meters.
D
watts.
4) Pulling down on a rope to hoist a sail on a sailboat is an example of a machine
A
changing the direction over which a force is exerted.
B
multiplying the force you exert.
C
reducing friction.
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 amount of friction.
B
the force exerted on the machine.
C
the distance an object is moved.
D
the change in direction.
6) An ideal machine would have an efficiency of
A
1 %.
B
10%.
C
100%.
D
50%.
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
scissors.
C
pliers.
D
fishing pole
9) The power of a light bulb the converts electrical energy at a rate of 100 joules per second is
A
100 watts.
B
50 watts.
C
40 watts.
D
200 watts.
10) What do machines do?
A
decrease the amount of work that is done
B
increase the amount of work that is done
C
eliminate friction
D
makes work easier
*select an answer for all questions
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