Introduction
A lever is simply a plank or ridged beam that is free to rotate on a pivot. It is perfect for lifting or moving heavy things. It is a very useful simple machine, and you can find them everywhere. Good examples of levers include the seesaw, crowbar, fishing-line, oars, wheelbarrows and the garden shovel.
A simple machine uses a single applied force to do work against a single load force. Ignoring friction losses, the work done on the load is equal to the work done by the applied force. The machine can increase the amount of the output force, at the cost of a proportional decrease in the distance moved by the load.
Quiz
1. An example of a lever is a
2. Which of the following is an example of a screw?
3. Ramps, a wedge, and a screw are all examples of
4. A force multiplier is a simple machine that multiplies you is
5. For a lever to be a first-class lever the fulcrum needs to be.
6. Which simple machine is an inclined plane wrapped around a cylinder?
7. Levers are divided into ___________ classes based on the location of the fulcrum and of the input and output forces.
8. If the fulcrum is closer to the effort, it will take
9. Effort is
10. What are examples of simple machines?
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A. pulley
B. Bicycle
C. Scissors
D. Screw
2. Which of the following is an example of a screw?
-
A. Hammer
B. Spiral staircase
C. Axe
D. Knife
3. Ramps, a wedge, and a screw are all examples of
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A. Levers
B. Pulleys
C. Wheels and axles
D. Inclined plane
4. A force multiplier is a simple machine that multiplies you is
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A. Strength
B. Effort
C. Load
D. Speed
5. For a lever to be a first-class lever the fulcrum needs to be.
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A. Between the load and the effort
B. On one side and the load and effort on the other side
C. On the same side as the load arm.
D. None of these.
6. Which simple machine is an inclined plane wrapped around a cylinder?
-
A. Wedge
B. Screw
C. Wheel and axle
D. Lever
7. Levers are divided into ___________ classes based on the location of the fulcrum and of the input and output forces.
-
A. Four
B. three
C. five
D. two
8. If the fulcrum is closer to the effort, it will take
-
A. More force to lift the load
B. Less force to lift the load
C. Equal force to the lift the load
D. No force to life the load
9. Effort is
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A. An inclined plane wrapped around a rod
B. A unit used for measuring the force
C. How far an object moves in a certain amount of time
D. The force applied to a simple machine.
10. What are examples of simple machines?
-
A. Doorknob and wheelbarrow
B. Bike and car
C. Inclined plane and lever
D. Hammer and nail
1. A lever or pulley connected to a shaft
2. Third class levers give a speed advantage because of they
3. Which of the following is not an inclined plane?
4. A Ferris wheel is an example of which kind of simple machine?
5. Which of the following is NOT a simple machine?
6. Simple machines (crowbar, ramp, axe, screw, and crane) do which of the following?
7. A ramp is a simple inclined plane that allows one to apply an input force ___________ the output force.
8. Which of the following is an example of a wheel and axle?
9. Which of the following is an example of a third-class lever?
10. A good example of a second class lever is the
-
A. wheel and axle
B. block and tackle
C. wheelbarrow
D. screw
2. Third class levers give a speed advantage because of they
-
A. The move a load through a large distance than the effort moves the same time
B. Moves an effort a further distance than the load
C. Allow you to catch a fish quickly before you applied so much effort
D. Allow you to pick up a heavy load quickly
3. Which of the following is not an inclined plane?
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A. Shovel
B. Screw
C. Ramp
D. Wedge
4. A Ferris wheel is an example of which kind of simple machine?
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A. Fixed pulley
B. Movable pulley
C. Wheel and axle
D. Incline Plane
5. Which of the following is NOT a simple machine?
-
A. a screw
B. a lever
C. a pair of scissors
D. a wheel and axle
6. Simple machines (crowbar, ramp, axe, screw, and crane) do which of the following?
-
A. Reduce the mass of an object that needs to be moved
B. Reduce the distance an object needs to be moved
C. Reduce the amount of time needed to move an object over a distance
D. Reduce the force needed to move an object over a distance
7. A ramp is a simple inclined plane that allows one to apply an input force ___________ the output force.
-
A. perpendicular to
B. less than
C. equal to
D. greater than
8. Which of the following is an example of a wheel and axle?
-
A. a pulley
B. a screwdriver
C. a block and tackle
D. a nutcracker
9. Which of the following is an example of a third-class lever?
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A. a nutcracker
B. a screw
C. a hand-held boat paddle
D. a crowbar
10. A good example of a second class lever is the
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A. Can-opener
B. Wheelbarrow
C. Hammer
D. Tongs
1A wedge is a modified
2. A pair of tweezers is
3. What are the two families of simple machines?
4. A first-class lever has the
5. A bottle opener belongs to which class of the levers.
6. Which of these is an example of a wedge?
7. Which is an example of someone using a simple machine to do work?
8. Which type of simple machine would be found on the bottom of a wagon?
9. Which is a characteristic of simple machines?
10. A screw is made up of ____ wrapped around a post or rod.
-
A. inclined plane.
B. wheel and axle.
C. lever.
D. pulley.
2. A pair of tweezers is
-
A. a compound machine made of two second-class levers.
B. a compound machine made of two third-class levers.
C. a first -class lever.
D. a kind of wedge.
3. What are the two families of simple machines?
-
A. First class and second class
B. pulley and screw
C. inclined plane and lever
D. wedge and compound.
4. A first-class lever has the
-
A. input force in the middle.
B. fulcrum in the middle.
C. fulcrum at one end and the input force between the fulcrum and the output force.
D. fulcrum at one end and the output force between the fulcrum and the input force.
5. A bottle opener belongs to which class of the levers.
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A. Effort in the middle
B. Fulcrum in the middle
C. Resistance in the middle
D. None of the mentioned.
6. Which of these is an example of a wedge?
-
A. skateboard
B. broom
C. stairs
D. butter knife
7. Which is an example of someone using a simple machine to do work?
-
A. a boy runs across a football field
B. a banker counts money
C. a mother pushes a stroller up a ramp into a building
D. a girl eats a sandwich.
8. Which type of simple machine would be found on the bottom of a wagon?
-
A. a pulley
B. a screw
C. a wedge
D. a wheel and axle
9. Which is a characteristic of simple machines?
-
A. They run on electricity.
B.They take a long time to make.
C. They have few or no moving parts.
D. They are not very large
10. A screw is made up of ____ wrapped around a post or rod.
-
A. tracks
B. springs
C. threads
D. strings
1. What two parts might make a pulley?
2. This machine converts motion in one direction into splitting motion acting at right angles.
3. A sloping surface that alters the force required to move the load in a perpendicular direction.
4. An arm that pivots on a point called a fulcrum.
5. When a rope or cable is wrapped over a grooved wheel it is called a:
6. Lifting a wheelbarrow best illustrates the use of which simple machine?
7. The use of a doorstop best illustrates the use of which simple machine?
8. How many basic types of simple machines are there?
9. What type of simple machine is an inclined plane wrapped around a pole?
10. An axe and a chisel are examples of what type of simple machine?
-
A. wheel and axle
B. wheel and wire
C. wheel and screw
D. wheel and fulcrum
2. This machine converts motion in one direction into splitting motion acting at right angles.
-
A. Screw
B. Wedge
C. Pulley
D. Wheel and Axle
3. A sloping surface that alters the force required to move the load in a perpendicular direction.
-
A. Wedge
B. Inclined Plane
C. Wheel and Axle
D. Pulley
4. An arm that pivots on a point called a fulcrum.
-
A. Lever
B. Screw
C. Pulley
D. Bevel Gear
5. When a rope or cable is wrapped over a grooved wheel it is called a:
-
A. Lever
B. Wheel and Axle
C. Pulley
D. Machine
6. Lifting a wheelbarrow best illustrates the use of which simple machine?
-
A. Lever
B. Wedge
C. Pulley
D. Screw
7. The use of a doorstop best illustrates the use of which simple machine?
-
A. Lever
B. Screw
C. Wheel and Axle
D. Wedge
8. How many basic types of simple machines are there?
-
A. 2
B. 3
C. 5
D. 6
9. What type of simple machine is an inclined plane wrapped around a pole?
-
A. Lever
B. Wheel and Axle
C. Pulley and Wedge
D. Screw
10. An axe and a chisel are examples of what type of simple machine?
-
A. Lever and Inclined plane
B. Wheel and Axle
C. Wedge
D. Screw
1. Which Greek philosopher is credited with first discovering and describing simple machines?
2. A simple machine that is actually a kind on an inclined plane is a
3. The mechanical advantage of a compound machine is determined by
4. The mechanical advantage for a pulley system is determined by
5. A screwdriver can be used to open a can of paint. In this the situation, the screwdriver is being used as a
6. Which type of lever always reduces the force applied?
7. A wire cutter is an example of:
8. Machines requires proper care and maintenance:
9. Wheelbarrow is an example of:
10. A pulley is a simple machine used to:
-
A. Plato
B. Socrates
C. Archimedes
D. Aristotle
2. A simple machine that is actually a kind on an inclined plane is a
-
A. pulley
B. wedge
C. gear
D. balance
3. The mechanical advantage of a compound machine is determined by
-
A. Adding the mechanical advantage for each simple machine
B. Finding the simple machine with the largest mechanical advantage.
C. Finding the average mechanical advantage for the simple machines.
D. multiplying the mechanical advantage for each simple machine
4. The mechanical advantage for a pulley system is determined by
-
A. Counting the number of strands holding the resistance force.
B. Counting the number of strands holding and not holding the resistance force.
C. Adding the radii of the pulleys.
D. Multiplying the radii of the pulleys.
5. A screwdriver can be used to open a can of paint. In this the situation, the screwdriver is being used as a
-
A. Wheel and axle.
B. Screw.
C. Lever.
D. inclined plane
6. Which type of lever always reduces the force applied?
-
A. The lever of the first order
B. The lever of the second order
C. The lever of the third order
D. All of these
7. A wire cutter is an example of:
-
A. The lever of the first order
B. The lever of second order
C. The lever of third order
D. None of these
8. Machines requires proper care and maintenance:
-
A. to make them look good
B. for preserving them for future
C. for their efficient and longer use
D. None of these
9. Wheelbarrow is an example of:
-
A. The lever of the first order
B. The lever of the second order
C. The lever of the third order
D. Inclined plane
10. A pulley is a simple machine used to:
-
A. multiply force
B. apply a force at a convenient point
C. apply a force in a convenient direction
D. None of these