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Physics
8th
grade
Simple Machines, Work, & Mechanical Advantage
20 questions
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- 1. Multiple Choice1. A book weighing 1.0 newton is lifted 2 meters. How much work was done?2 J0.5 J
4 J
3 J
- 2. Multiple ChoiceA force of 15 newtons is used to push a box along the floor a distance of 3 meters. How much work was done?3 J45 J
5J
150 J
- 3. Multiple Choice
It took 50 joules to push a chair 5 meters across the floor. With how much force was the chair pushed?
250N10N100 N
0.10 N
- 4. Multiple ChoiceA force of 100 newtons was necessary to lift a rock. A total of 150 joules of work was done. How far was the rock lifted?1.5m15,000 m
0.67 N
250 J
- 5. Multiple ChoiceIt took 500 newtons of force to push a car 4 meters. How much work was done?2,000 J125 J
0.008 J
1000 J
- 6. Multiple ChoiceA young man exerted a force of 9,000 newtons on a stalled car but was unable to move it. How much work was done?9,000 J0 J= No work
9 J
900 J
- 7. Multiple Choice
Which 3 parts make up "Work"?
A force must be applied to the object
The object must move
The object must move in the same direction as the force
The object must move in the opposite direction as the force
- 8. Multiple Choice
Mass (m)
Force (F)
Joules (J)
Work (W)
- 9. Multiple Choice
Mathematically...we say: Work equals
Force x Mass
Force x Distance
Mass x Acceleration
- 10. Multiple Choice
True or False?
A simple machine does not help you do less work.
True
False
- 11. Multiple Choice
The output can also be known as which two?
Load
Resistance
Applied Force
Effort
- 12. Multiple Choice
A lever is used to lift a heavy box with an input arm of 4 meters and an output arm of 0.8 meters. What is the mechanical advantage of the lever?
5
0.2
3.2
6
- 13. Multiple Choice
A force of 50 N is applied to the end of a lever to lift a rock that is 350 N. What is the MA of the lever?
70
0.14
7
17,500
- 14. Multiple Choice
False
True
- 15. Multiple Choice
What are TWO ways that we can find the Mechanical Advantage of a Pulley system?
Count the number of supporting ropes, minus the one you are pulling on
Count the number of supporting ropes in total
Count the number of wheels involved
Count the number of wheels, minus one
- 16. Match
Match the following terms to the correct Simple Machines
Lever
Wedge
Inclined Plane
Pulley
Wheel & Axle
- 17. Multiple ChoiceJeff 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?0248
- 18. Multiple ChoiceMechanical advantage is a measure of how much a machine multiplies the inputefficiency.force.power.work.
- 19. Multiple Choice
The mechanical advantage of this inclined plane is...(MA=Resistance Force/Effort Force)
2.4
3.4
4.4
- 20. 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
- Answer choicesTagsAnswer choicesTags