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PS Ch. 5 Work And Machines
Test Description: Ch. 5 Review
Instructions: Answer all questions to get your test result.
1) Power is work done over _____
A
watt
B
distance
C
energy
D
time
2) Some of the energy put into a machine is changed into heat because of _____
A
friction
B
efficiency
C
mechanical advantage
D
lever
3) A machine that only changes the direction of a force has a mechanical advantage of _____
A
10
B
1
C
100
D
5
4) The measure of how much work put into a machine is changed into useful work put out by the machine is _____
A
effort force
B
efficiency
C
mechanical advantage
D
ideal mechanical advantage
5) In a first class lever
A
the mechanical advantage is 0
B
the fulcrum is in between the effort and resistance forces
C
the effort force is in between the resistance force and the fulcrum
D
the resistance force is in between the effort force and the fulcrum
6) How much power does a person weighing 500N need to climb a 3 m ladder in 5 s?
A
3 watts
B
30 watts
C
30 joules
D
3 joules
7) Using a ramp 6 m long, workers apply an effort force of 1,250 N to move a 2,00 N crate onto a platform 2 m high. What is the efficiency of the ramp?
A
7,500 joules
B
53%
C
4,000 joules
D
35%
8) Which of these cannot be done by a machine?
A
change direction of a force
B
multiply force
C
work
D
multiply energy
9) In an ideal machine which of the following is true?
A
Work input is equal to work output.
B
Work input is less than work output.
C
Work input is greater than work output.
D
Work input is dependent on work output.
10) An adult and a child are on a seesaw, when the fulcrum is in the middle the child can not move the adult. How should the fulcrum be moved so the two can seesaw?
A
move to the left
B
toward the child
C
no movement necessary
D
toward the adult
*select an answer for all questions
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