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WorksheetsLevers Quiz - Review
Total questions: 41
Worksheet time: 1hrs 28mins
What type of lever
First Class Lever
Second Class Lever
Third Class Lever
What class lever does this picture show?
1st
2nd
3rd
Which lever would be the easiest to lift the load?
A
B
C
What is effort (input) force?
the force one exerts on a machine
the force which an effort force must overcome in order to do work on an object via a simple machine.
the force the machine exerts on a object
the output work times the input distance
Which of the lever would it take less force to lift?
Lever A
Lever B
Which of the levers would have the largest IMA?
A
B
C
Which lever has the largest IMA?
A
B
C
Which lever has an IMA of more than one?
C
A
B
You use a lever to try and lift a rock, but you are unable to lift it. What are two ways you can adjust the lever to increase your IMA?
Move the input force away from the fulcrum
Move the output force closer to the fulcrum
Move the input force closer to the fulcrum.
Move the output force away from the fulcrum
What is the IMA of this lever?
3
.3
4
.25
What is the IMA of this lever?
1
2
5
.5
What is the IMA of the lever?
3
2
4
1
At what distance should a 2N load placed from the pivot so that the see saw won't move?
0.2m
0.5m
0.45m
0.42m
Compute the ideal mechanical advantage of the following lever.
(input = effort, output - resistance)
0.667
1.5
6
4
A worker uses an iron bar to raise a manhole cover weighing 65N. The effort arm of the lever is 60cm long. The resistance arm is 25cm long. What is the mechanical advantage of the iron bar?
(a)
In order to move a large log at camp we use a long pole. The mechanical advantage of the pole is 8. If the log weighs 156N, what effort force is needed to lift the log?
(a)
Three of your friends are all sitting on one end of a seesaw. The combined weight is 275N. The length from the fulcrum to your friends is 2.5m. The rest of the seesaw (from fulcrum to the other end) is 4.5m. What effort force, to the nearest tenth, is needed to lift your friends?
(a)
What is the mechanical advantage of a lever if the effort arm is 6 feet and the resistance arm is 2 feet?
a) 1
b) 2
c) 3
d) 4
What is the effort force required to lift a 300-newton rock using a lever with a mechanical advantage of 3?
a) 200 newtons
b) 250 newtons
c) 300 newtons
d) 100 newtons
What is the IMA of this lever?
3
.3
4
.25
A box of weight W is lifted by a force F using a lever as shown below.
What is the mechanical advantage of the lever (MA=Input Distance/Output Distance)?
0.5
2
3
6
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. What was his MA?
0
2
4
A lever has an effort (input) arm length of 75 ft and an output (resistance) arm length of 25 ft. The actual mechanical advantage of this lever is:
3
.33
1875
not enough information to solve this
The IMA (ideal mechanical advantage) formula of a lever is:
output/input
input/output
distance of effort/ distance of resistance
resistance arm length/effort arm length
For a lever, AMA is calculated using measurements of the:
forces
distances
the lengths of the effort and resistance arms
the input and the output
The 3 parts of a lever are:
fulcrum, effort, and load
load, output, and input
input, effort, and fulcrum
pivot, output, and fulcrum
The amount that input is magnified by a simple machine is known as the :
mechanical advantage
output force
resistance
none of these
A simple machine has an input force of 12 N and an output force of 4 N. What is its mechanical advantage?
.33
3
8
16
