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WorksheetsPhysics Unit 8 Review: Work and Power
Total questions: 20
Worksheet time: 45mins
A teacher applies a force to a wall and becomes exhausted.
Work is done on an object when an applied force causes the object to move in the same direction as the force.
agree
disagree
How much work is done against gravity lifting a 2 kg-sack of groceries a distance of 2.5 meters?
24.4N
5N
19.6N
49N
A machine exerts a force of 300 N to push a box 30.0 m horizontally in 3.00 s. Calculate the power of the machine.
27000 W
100 W
10 W
3000 W
Which object has the most amount of work done on it?
W
X
Y
Z
ln the Empire State Building Run-Up, competitors race up the 1576 steps (86 flights) of the Empire State Building, climbing a total vertical distance of 320 m. How much work does a m 74 kg racer do?
2.321 × 105 Joules
2.326 × 105 Joules
2.318 × 105 Joules
2.317 × 105 Joules
If a 74 kg racer took 798 s to climb the 320 m, how power did she developed?
291 Watts
281 Watts
317 Watts
313 Watts
This weight lifter raised 105 kg to a height of approximately 2.31 m in 9 seconds. How much power did he developed?
264 Watts
1029 Watts
2,377 Watts
4,009 Watts
How much work is done when 114 W of power is used over 0.62 s?
70.68 J
183.87 J
57.62 J
No work is done.
The IMA (ideal mechanical advantage) formula is:
output/input
input/output
distance of effort/ distance of resistance
resistance arm length/effort arm length
What type of simple machine is found on the cap of a pickle jar?
screw
pulley
inclined plane
lever
A double inclined plane that can split objects apart
Wheel and Axle
Wedge
Screw
Inclined Plane
Which object has the most power?
W
X
Y
Z
Using a lever, Joe is able to lift a 10,000 N car off of the ground with a force of 1000 N. What is the mechanical advantage of the lever?
1
10
100
1000
