WorksheetsMechanical Advantage and Efficiency
Total questions: 15
Worksheet time: 15mins
A pulley is used to raise a heavy crate. The pulley is such that an input force of 223 N is needed to provide an output force of 1784 N. What is the mechanical advantage of this pulley?
8
0.125
397,832
1561
A knife has a slope of 3 centimeters and the width is 1.5 centimeters, what is the mechanical advantage of this wedge?
2
0.5
3
4.5
A machine has a work output of 8 joules and requires 10 joules of work input to operate. What is the machine's efficiency?
8 J
10 J
80%
800%
What is the efficiency of a machine that has work input of 40 joules and work output of 35 joules?
87.50%
1200
1.142
114%
Jeff is a landscaping contractor and lifts a rock weighing 600 pounds by wedging a board under the rock. Jeff weighs 150 pounds and puts all of his weight on the lever. How much mechanical advantage did the lever provide to Jeff in lifting the rock?
0
2
4
8
A lever and fulcrum are used to lift a fallen tree, which has a weight of 480 N. If the lever has a mechanical advantage of 5.5, what is the input force that will begin lifting the tree off the ground?
5.5 N
40.7 N
87.3 N
2640 N
What is the efficiency of the machine if the input is 263 J and the output is 142 J?
6.26%
54%
100%
260%
This device
wedge
lever
incline plane
wheel and axle
the percentage of the input work that is converted to output work
mechanical advantage
efficiency
joule
machine
A pulley system is used to lift a load of 200 N with an input force of 50 N. What is the mechanical advantage of the pulley system?
2
3
4
5
If a machine has a mechanical advantage of 10 and an efficiency of 80%, what is the actual output force if the input force is 100 N?
800 N
1000 N
1200 N
8000 N
A ramp is used to lift a box to a height of 2 meters. If the length of the ramp is 10 meters, what is the mechanical advantage of the ramp?
0.2
2
5
10
In an experiment, a lever is used to lift a 300 N weight with an input force of 100 N. What is the efficiency of the lever if the work input is 400 J and the work output is 300 J?
50%
75%
80%
100%
A machine requires 500 J of input work to produce 400 J of output work. What is the efficiency of the machine?
80%
85%
90%
95%
Which of the following best describes mechanical advantage?
The ratio of output force to input force
The ratio of input force to output force
The percentage of input work converted to output work
The total work done by a machine
