
Simple Machines Lessons
Presentation
•
Science
•
7th Grade
•
Hard
Joseph Anderson
FREE Resource
9 Slides • 16 Questions
1
2
3
4
5
6
7
8
9
10
Multiple Choice
You push down on a lever with a force of 100 N to lift a 500 N box.
What is the input force?
100 N
500 N
11
Fill in the Blanks
You push down on a lever with a force of 100 N to lift a 500 N box.
What is the mechanical advantage of the lever?
Type answer...
12
Fill in the Blanks
As a percent, what is the efficiency of a machine that puts out 90 J of work when you put in 100 J of work?
Type answer...
13
Multiple Choice
A wheelbarrow is a good example of what class of lever?
first class
second class
third class
14
Multiple Choice
A human arm is a good example of what class of lever?
first class
second class
third class
15
Multiple Choice
Which of these items is a first class lever?
scissors
fishing rod
tweezers
none of these
16
Multiple Choice
A wedge has an output force of 25 N when given an input force of 5 N. What's the wedge's mechanical advantage?
0.2
5
20
30
17
Multiple Choice
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
18
Multiple Choice
The 3 parts of a lever are:
fulcrum, effort, and load
load, output, and input
input, effort, and fulcrum
pivot, output, and fulcrum
19
Multiple Choice
The IMA (ideal mechanical advantage) formula of a lever is:
output/input
input/output
length of input arm/length of output arm
resistance arm length/effort arm length
20
Multiple Choice
What is the ideal mechanical advantage of an inclined plane which has 4 cm height and length of 16 cm?
21
Multiple Choice
What is the Mechanical Advantage of an inclined plane with a height of 36 inches and a length of 72 inches?
2
4
.5
1/2
22
Multiple Choice
23
Multiple Choice
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
24
Multiple Choice
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 (MA=Output Force/Input Force)?
1
10
100
1000
25
Multiple Choice
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