Chapter 14 - Newton's Second & Third Law of Motion
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Created by:
sherifaulk on February 6, 2011
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Lesson 2 - 2nd & 3rd law of Motion
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17 terms
Terms | Definitions |
|---|---|
 balanced forces | forces that cancel each other out when acting together on a single object |
| unbalanced forces | forces that do not cancel each other out when acting together on a single object |
| action | the force one object applies to a second. (Newton's 3rd law) |
| reaction | the force with which an object responds to an action (Newton's 3rd law) |
| work | the use of force to move an object a certain distance |
| simple machine | a machine with few moving parts, making it easier to work |
| lever | a simple machine made of a rigid bar a fixed point called a pivot point (or fulcrum) |
| fulcrum | the pivot point of a lever |
| effort arm | the part of the lever that applies force to the resistance arm |
| resistance arm | the part of the lever that applies force to the load the machine acts against |
| Newton's second Law of Motion | when an unbalanced force acts on an object, the objects acceleration equals the force divided by the objects mass. (action= force/mass) |
| Newton's third Law of Motion | For every action the is a equal but opposite reaction . |
| Example of Newton's 1st Law | a football will sit still on a level field until a kicker kicks it. a ball will roll down a hill until the angle of the hill changes direction |
| Example of Newton's 2nd law | when you use your arm to throw a football, the football excellerates through the air if the force of the throw is stronger than the mass and the air pushing against the ball. |
| Example of Newton's 3rd law | Car moving forward: tires push on the road and the road pushes back - the reaction force propels the car forward. |
| Two examples of inertia | When you are in a car moving forward and slam on the brakes, your body will move forward. If you go around a corner in a car really fast - your body will lean the opposite direction of the turn. |
| Name 6 simple machines | inclined plane lever pulley screw wedge wheel & axle |
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