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Forces and Newton's First Law of Motion

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Matthew Lane

on 1 November 2012

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Transcript of Forces and Newton's First Law of Motion

Explaining What Objects Move Forces and Newton's First Law of Motion Forces A force is a push or a pull Combining Forces Net Forces are created when forces combine... Newtons First Law Objects will not change their motion unless acted upon by an unbalanced outside force Friction Friction is a rubbing force that acts against motion when two surfaces come in contact Forces cause objects to move or stop There is usually more than one force acting at one time Net force is the combination of all forces acting on an object Net Force Forces in the same direction add together Forces in different directions are subtracted Balanced forces are forces that cancel each other out and do not cause a change in an objects motion Unbalanced forces are forces that don't cancel
out and cause a change in an objects motion Net Force equals 0N Measured in Newtons (N) Net Force does not equal 0N An object that is at rest will remain at rest An object in motion will continue to move at a constant velocity All matter has a tendency to resist any change in motion

This property is called Inertia The more mass an object has the greater it's inertia Big trucks need bigger engines to get them going and they are
also harder to stop If motion needs a force to change why do objects slow down? Friction slows and stops objects Occurs whenever objects touch There are three different types of friction Static Friction: Friction that prevents an object from starting to move Sliding Friction: Friction that slows down an object that is sliding Rolling Friction: Friction that slows down an
object that is rolling. Not as strong as sliding
friction because less surface area is touching
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