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- 1. Multiple ChoiceUsing 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?1101001000
- 2. Multiple Choice
How does a single fixed puled, like the one seen here, help you do work?changes the direction of the forceincreases the amount of applied forcedecreases the amount of applied forceallows you to pull the rope a shorter distance - 3. 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
- 4. Multiple ChoiceA 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 N40.7 N87.3 N2640 N
- 5. Multiple ChoiceWhen given input and output forces, you find mechanical advantage by:Output divided by inputInput divided by outputOutput multiplied by input
- 6. Multiple ChoiceName the class of lever.Class 1Class 2Class 3Class president
- 7. Multiple ChoiceWhat is the mechanical advantage for this lever?121/28
- 8. Multiple ChoiceWhat is the input force?50 N4 m12 m150 N
- 9. Multiple ChoiceWhat is the mechanical advantage for the inclined plane?51/54517
- 10. Multiple ChoiceWhat is effort (input) force?the force required by a machine in order to accomplish work (the force you put on the 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 objectthe output work times the input distance
- 11. Multiple ChoiceWhat is resistance (output) force?the force required by a machine in order to accomplish work (the force you put on the 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 objectthe output work times the input distance
- 12. Multiple Choice
A first class lever in static equilibrium has a 50-lb resistance force and 15-lb effort force. The lever’s effort force is located 4 ft from the fulcrum. Calculate the length from the fulcrum to the resistance force.
1.2 feet
13.3 feet
4 feet
3.33 feet
- 13. Multiple Choice
An industrial water shutoff valve is designed to operate with 30 lb of effort force. The valve will encounter 200 lb of resistance force applied to a 1.5- in.-diameter axle. What is the required wheel diameter to overcome the resistance force?
10 in
5 in
1 in
0.225 in
- 14. Multiple Choice
A construction crew lifts approximately 560 lb of material several times during a day from a flatbed truck to a 32-ft rooftop. A block and tackle system with 50 lb of effort force is designed to lift the materials. What is the MA of the system?
11.2
0.089
17.5
1.56
- 15. Fill in the Blank
Given a machine with an inclined plane with a MA of 1.5, a wheel and axle with an MA of 0.98, and a pulley with a MA of 3, what is the TOTAL MA of the machine?
- 16. Fill in the Blank
Given a machine with an inclined plane with a MA of 0.5, a wheel and axle with an MA of 0.23, and a pulley with a MA of 4, what is the TOTAL MA of the machine?
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