## 4th Science - Energy, Motion, Machines

##### Created by:

ktholcomb  on December 12, 2011

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# 4th Science - Energy, Motion, Machines

 Name the two types of energyPotential and kinetic
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#### Definitions

Name the two types of energy Potential and kinetic
Kinetic energy The energy of motion
Conservation of energy Energy can change form, but it can never be destroyed.
Force The push or pull of one object on another
Work A force applied to an object causing it to move
Potential energy the energy associated with position or the arrangement of parts
Work always involves the transfer of ... potential energy to kinetic energy
Energy when an object isn't moving is... Potential energy.
Energy when an object is moving is... Kinetic energy.
Motion A change in position
Friction the force that resists the movement of objects against each other
The amount of work you do depends on how much... force you use to move an object.
The amount of work you do depends on how far... you move something.
First law of motion Objects at rest stay at rest and objects in motion stay in motion unless they are acted upon by an outside force.
Second law of motion An object's ability to speed up is affected by its mass and the amount of force exerted on it.
Third law of motion For every action, there is an equal and opposite reaction.
When a force is applied to something, it will push back with an equal force.
Acceleration to speed up
An object at rest will tend to... stay at rest
Reaction is something that can move an object or cause it to stop moving
Machine something that makes work easier by changing the force you apply to do work
Simple Machine machine with one kind of movement
Six kinds of simple machines: lever, wheel and axle, pulley, inclined plane, wedge, and screw
What machines change: the effort you have to put out.
Effort the force that causes an object to move
Load the weight of the object being moved
Three parts of a lever effort, fulcrum, and load
First class lever fulcrum is located between the effort and the load
Second class lever load located between effort and fulcrum
Third class lever effort between fulcrum and load
Wedge inclined plane that moves
Pulley Grooved wheel with a rope that fits in the groove. It helps lift heavy or large objects
Fixed pulley attached to something and cannot move
Block and tackle combines fixed pulley and movable pulley

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