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Worksheets4.1 - Work(15pts.)
Total questions: 12
Worksheet time: 13mins
Approximately how much work do you do (in Joules) when you lift your 10.0 kg sister to a height of 1.5 m?
NOTE: MASS x GRAVITY = WEIGHT [FG]
[NUMBER ONLY/ NO UNITS]
A particular lever is 90.0% efficient. If 50.0 J of input work are done on the lever, then how much output work does the lever do, on its load?
[NO UNITS/ NUMBER ONLY]
The mechanical advantage of a pulley system is 4.00. Using this pulley system, how much force do you need to exert to lift a 500.0 N box?
[Reminder: Pulleys REDUCE force through Mechanical Advantage]
[NO UNITS/ NUMBER ONLY]
Which simple machines represent variations of an inclined plane? [Select all that apply]
wedge
wheel and axle
lever
pulley
screw
Which factor increases as the efficiency of a machine increases? [MORE EFFICIENT]
More input work
More output work
Friction
Air Resistance
It takes 600 J of work to lift a person up but 1200 J to push that person up a ramp to the same height.
What is the efficiency of the ramp?
0%
25%
50%
100%
An input force of 80 N is used to lift an object weighing 240 N with a system of pulleys. What is the mechanical advantage of the pulley system?
1
3
0.33
19,200
Organize these machines by how they are useful.
Bicycle
Wedge/ Axe
Car Jack
Trebuchet
What percent of Work is done at 60o?
10%
35%
50%
0%
What percent of Work is done at 90o?
10%
35%
50%
0%
What angle do work equal 80%?
10
35
50
70
What angle do work equal 20%?
10
35
50
80
