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- 1. Multiple Choice
How can you decrease the effort force needed to push a weight to the top of the ramp?cover the surface with carpetincrease the length of the rampincrease the height of the rampdecrease the length of the ramp - 2. Multiple ChoiceHow 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 ChoiceBarbie sits on one end of a see-saw and Ken sits on the other. Barbie goes up in the air and Ken stays down on the ground. In order for Ken to make Barbie move down, he shouldstand on the boardpush down on the boardmove towards the centermove away from the center
- 4. Multiple ChoiceThe amount by which a machine multiplies input force is known as thework.power.output force.mechanical advantage.
- 5. Multiple ChoiceA 62 kg box is lifted 12 m off the ground. How much work was done? (hint: calculate Fw first)5.17 J72.91 J744.0 J7291.2 J
- 6. Multiple ChoiceMechanical advantage is a measure of how much a machine multiplies the inputefficiency.force.power.work.
- 7. Multiple ChoiceCalculate the amount of work done if you use a 100N force to push a 50 kg box 5 m across the kitchen floor.250 J500 J5000 J50,000 J
- 8. Multiple ChoiceWhat is the primary mechanical advantage of using the simple machine seen in the image?You can apply a large force and have it penetrate over a very long distance.You can apply a long distance and have it convert into a very short distance.You can apply a short distance and have it multiplied to penetrate a large distance.You can apply a small force to penetrate something that normally requires a large force.
- 9. 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
- 10. Multiple ChoiceA screwdriver is an example of a wheel and axle, which is a type of simple machine. The mechanical advantage of a wheel and axle is the ratio of the radius of the wheel to the radius of the axle. The force required to turn a screw can be reduced byreducing the length of the axle.increasing the radius of the axle.reducing the length of the handle.increasing the radius of the handle.
- 11. 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
- 12. Multiple ChoiceElevators lift loads by employing a motor and a complex system of pulleys. If the elevator converts all the energy used to work (no heat or friction is generated), how many Joules would be required to lift a 2,500 N load 15 m? This is about five floors in a typical building.1637 J3827 J37500 J167 J
- 13. Multiple ChoiceA 16 N force is applied to an object and 96 J of work is done. How far was the object moved?6 m16 m80 m1536 m
- 14. Multiple ChoiceWhat is the mechanical advantage of the block and tackle used to lift the bale of cotton?1234
- 15. 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
- 16. Multiple ChoiceTo lift a load off the ground, the force required is equal to the weight of the load. In case of a lever, however, a small effort force can be used to lift a much heavier load. How is this possible?Levers use the weight of the load combined with the effort to lift the load.Levers combine the weight of the load with the force of gravity to lift the load.Levers reduce the force required by increasing the distance over which the force is applied.Levers distribute the load over their length, thereby reducing the force required to lift the load.
- 17. Multiple Choice
This 2000 N weight is raised 1 meter by pulling 4 meters of rope. What force was required to pull the rope?500 N1000 N2000 N8000 N - 18. Multiple Choice
What is the primary mechanical advantage of using the simple machine seen in the image?You can apply a small input force and have it multiplied into a large output force.You can apply a large input force and have it multiplied into a small output force.You can apply a small input distance and have it multiplied into a large output distance.You can apply a large input distance and have it multiplied into a small output distance. - 19. Multiple Choice
Lifting a bale of cotton is no easy task. Farmer Jones wanted to store the cotton in the loft of his barn but he could not budge the bale. He consulted the high school's science teacher for help. She suggested a simple machine.
Farmer Jones' options included an inclined plane, a fixed pulley, a block and tackle, and a lever. If he had to lift the bale of cotton to a height of fifteen feet, which would be the MOST practical solution?leverscrewinclined planeblock and tackle (pulley system) - 20. Multiple ChoiceA sales clerk at a local hardware store sells you a hammer with a mechanical advantage of 10 when used to pry up nails. You are able to create a force of 60 N. Using the hammer, what would be the maximum force that could be generated to remove a nail?0.167 N6 N600 N6000 N
- 21. Multiple ChoiceThis pulleyhas a mechanical advantage of 1 and does not make work easier.has mechanical advantage of 2 and reduces the force needed to lift an object.has a mechanical advantage of 2 and changes the direction of the applied force.has a mechanical advantage of 1 and changes the direction of the force needed to lift an object.
- 22. Multiple ChoiceDevin decides to start a summer job mowing lawns. In his first job, he pushes his lawn mower a total of 1.5 km. The lawn mower weighs 10 kg. During this job, Devin pushes the mower with an average force of 75N. Determine the amount of work done by Devin when mowing the lawn.15 J15000 J112500 J112.5 J
- 23. Multiple Choice
To lift this 2000 N weight to a height of 1 meter by hand, a mover did 2000 joules of work. Assuming the pulleys are frictionless, how much work does he do when using this block-and-tackle device?500 J1000 J2000 J4000 J - 24. Multiple ChoiceA 10 Newton effort force is required to lift a 10 kg box just off the ground. What is the effort required to lift the box off the ground using a 3m long lever? [The fulcrum is placed 0.5m from the box.]0.5 N2.0 N5.0 N8.0 N
- 25. Multiple ChoiceJonathan must lift a 3000N rock using a lever. Jonathan uses 300N of force to push down on the lever to move the rock. What is the ratio of the load to effort in this case?1:33:11:1010:1
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