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36 Cards in this Set
- Front
- Back
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_____ is a force acting on something as it moves a certain distance.
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work
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Give the formula for work and indicate the units of measure for each.
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Force (newtons) x distance (meters) = work (joules)
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If you push a box against 10 newtons of friction for 5 meters, how many joules of work have you performed?
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10 newtons x 5 meters = 50 joules
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If you carry a box weighing 25 newtons for 8 meters, how many joules of work have you performed?
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25 newtons x 8 meters = 200 joules
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The unit used to measure work is called _________.
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joules
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The unit used to measure force is _____.
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newtons
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How did God first create levers?
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God created levers in the human joints, your head is a first-class lever.
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A ____ is any object that makes work easier.
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machine
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Simply machines do/do not reduce the amount of work done.
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DO NOT REDUCE THE AMOUNT OF WORK
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The force applied to a simple machine is called __ ___.
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effort force
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The force that works against the effort force is called ___ __.
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resistance force
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Resistance force is often the ___ of the object being moved.
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weight
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Name the six simple machines:
1 2 3 4 5 6 |
1.lever
2.pulley 3.wheel and axle 4.inclined plane 5. screw 6.wedge |
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A ____ is any bar that runs on a point.
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lever
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Give an example of a lever:
1 2 3 |
1. seesaw
2. wheelbarrow 3. broom |
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The spot where a lever bar turns is called the ____.
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fulcrum
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_____ was one of the first mathematicians to study levers.
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Archimedes
Arch - i - medes |
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Name the three types of levers:
1 2 3 |
1. First-class
2. Second-class 3. Third-class |
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The ___ ___ lever has the fulcrum located between the effort and the resistance.
(A paint can opener) |
first-class
(effort - fulcrum - resistance) |
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The __ ___ lever has the resistance between the effort and the fulcrum.
(a door) |
second-class
(effort - resistance - fulcrum) |
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The __ ___ lever has the effort between the resistance and fulcrum.
(broom) |
third-class
(resistance - effort - fulcrum) |
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A ____ is a grooved wheel with a chain or rope wrapped in a groove; used to raise or lower things.
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pulley
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Name the two types of pulleys:
1 2 3 |
1. fixed pulley (flagpole)
2. moveable pulley 3. block and tackle (construction cranes) |
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___ _____ is the decrease in effort that is needed to move an object.
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mechanical advantage
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A ____ and ____ consist of a wheel and a rod(axle) running through a wheel.
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wheel and axle
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A ___ is an example of a wheel and axle.
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turbine
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A ____ is a type of wheel and axle.
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gear
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An __ ___ is a flat, slanted surface, such as a ramp.
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inclined plane
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When using an inclined plane, what give the most mechanical advantage(requires the least amount of work)?
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when the incline plane is a gradual slope and the length of the plane is longer
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A ___ is two inclined planes placed back to back; a knife, blade or axe.
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wedge.
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A wedge ___ or ____objects.
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splits or lifts
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A ___ is an inclined plane wound around a cylinder or cone.
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screw
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The ridges of a screw are called ____.
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threads
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Screws depend on ____ to stay in place; that is why it is hard to take a screw out of wood.
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friction
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A ___ ____ combines two or more simple machines to make work even easier.
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compound machine
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Name a compound machine:
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scissors
screw and screw driver |
