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Work, Force, Power, & Mechanical Advantage 1
Test Description: Work, Force, Power, & Mechanical Advantage - 8th grade physical Science
Instructions: Answer all questions to get your test result.
1) Caroline uses 20N of force to move a box of books 15m. How much work did she do?
A
1.33J
B
0.75J
C
35J
D
300J
2) If you punch a punching bag hard, has work been done?
A
No, because the bag did not move when it was struck by the glove
B
Yes, because the bag was moved in a different direction
C
Yes, because the glove provided a force that moved the bag a distance
D
Yes, because the bag was moved forward and backward
3) Finding the ratio of a machine's output force/input force gives you the machine\'s
A
mechanical efficiency
B
mechanical advantage
C
power
D
wattage
4) By oiling the gears on her bike, Rebecca decreases the friction between moving parts and therefore increases the
A
power of her bicycle
B
mechanical efficiency of her bicycle
C
input work of her bicycle
D
output force of her bicycle
5) If an inclined plane had a length of 20m and a height of 5m, what would the mechanical advantage be?
A
.25
B
5
C
4
D
15
6) The number of times a machine multiplies your effort force is called -
A
mechanical advantage
B
work
C
mechanical efficiency
D
power
7) In science, a push or a pull is called a
A
work
B
force
C
motion
D
power
8) Daniel and Ryan both work at a car wash. It takes Daniel 20 minutes to wash a car and Ryan 10 min. Ryan has
A
half the power that Daniel has
B
half as much work as Daniel
C
twice the work compared to Daniel
D
twice as much power as Daniel
9) The movement of an object is the result of
A
a push on the object
B
a pull on an object
C
unbalanced forces
D
equally applied forcesI
10) It took Bradley 45s and 60N of force to move a sofa 5m into a moving truck. How much power did he exert?
A
12W
B
1.33W
C
300W
D
6.67 W
*select an answer for all questions
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