Simple Machines
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| energy | a property that enables something to do work.
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| Work | occurs when a force is applied to an object over a distance, and the object moves in response to the force.
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| If something has the ability to cause a change in motion, it is has _______. | energy
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| Energy can cause ____ to be done, so when we see work done, we see evidence of energy. | work
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| A spring scale is used to measure _____. | force
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| Force is measured in SI units called ____ | newtons
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| simple machine | a device that helps reduce the amount of force required to do work.
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| A simple machine allows the user to apply a smaller force over a ______ distance to move an object. | larger
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| Simple machines can also change the _____ of the force applied. | direction
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| lever | a rigid bar or board that is free to move around a fixed point
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| fulcrum | the fixed point about which a lever pivots
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| The _____ may be placed at different locations along the lever. | fulcrum
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| By increasing the ________ from the fulcrum to the point where the effort force is applied, a lever can reduce the amount of force required to lift the weight. |
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| By decreasing the distance the _____ is from the fulcrum, a lever can reduce the amount of force required to lift a weight. | weight
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| pulley | a grooved wheel with a rope running along the groove.
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| _____ can change the amount and/or the direction of the effort force applied. | Pulleys
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| _______ pulleys are used to reduce the effort force. | movable
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| A single fixed pulley changes only the ______ of the force. | direction
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| inclined plane | a sloping surface that reduces the amount of force required to lift an object.
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| An inclined plane can be designed to reduce the force needed to lift a weight by ______ the length of the ramp or _______ the height of the ramp. | increasing; decreasing
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| Scissors, a crowbar, tweezers, a broom, a wheelbarrow, and bottle opener are all examples of a simple machine called a _______. | lever
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| ____ pulleys can be found on a flag pole or window blinds. | Fixed
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| ____ pulleys can be found on cranes and as part of a block & tackle system. | Movable
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| fixed pulley | a pulley that is attached to a structure
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| movable pulley | a pulley that is not attached to a structure
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| wedge | an inclined plane that can move
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| Knives and nails are examples of ______. | wedges
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| screw | an inclined plan wrapped around a post or cylinder.
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| Wheel and axles | consist of two circular objects that rotate.
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| Door knobs, steering wheels, screwdrivers, and gears are all examples of simple machines called ____. | wheel & axles
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| Complex machines | consist of two or more simple machines.
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| Complex machines are also known as _____ ______. | compound machines
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Created by:
Ms. Phillips
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