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Forces

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by

Kayley G

on 9 December 2013

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Transcript of Forces

Forces
By Kayley Gehrels
Newton's 3 Laws of Motion
1st law- An object at rest will remain at rest unless acted upon by a nonzero net force. An object moving at a constant velocity will continue moving at a constant velocity unless acted upon by a nonzero net force.
2nd law- An object 's acceleration depends on its mass and on the net force acting on it.
3rd law- If one object exerts a force on another object, then the second object exerts a force of equal strength in the opposite direction on the first object.
Different Types of FRICTION
Sliding Friction: Occurs when two solid surfaces slide over each other. Is what makes moving objects slow down and stop.
Static Friction: Acts between two objects that aren't moving. Is what makes things hard to push or pull.
Fluid Friction: Occurs when a solid object moves through a fluid. A fluid could be air or water.
Rolling Friction: Occurs when a object rolls across a surface.
Vocabualry
newton- SI unit for measuring a force

force- push an or a pull

net force- the combination of all the forces acting on an object

friction- force between two objects that are rubbing against each other

gravity- force that pulls everything together

mass-measure of amount of matter in an object

weight- measure of the force of gravity on an object

inertia- resistance to change in motion

momentum- characteristic of a moving object, is related to mass and velocity

free fall- when the only force acting on an object is gravity

centripetal force- force that causes an object to move in a circular path
Momentum
The momentum of a moving object can be determined by multiplying the objects mass by velocity.

mass x velocity
The total momentum of any group of objects stays the same unless acted on by an outside force.
Free Fall and Circular Motion
Free fall is a motion where acceleration is caused by gravity.
Satellites in orbit around Earth continuously free fall toward Earth,Earth is round so they fall around it
Law of Conservation of Momentum-
states that, in the absence of outside forces, the total momentum of objects that interact does not change.
Force, Friction ,Gravity
Force
Friction
Gravity
A force is described by its strength and the direction it acts.

Thanks for watching!
Music:
Morning Star Flower Song
by Naki
Sources:
Interactive Science Book
book 2 Forces and Energy
The types of surfaces involved, and how hard the surfaces are pushed together, are the 2 factors that affect the force of friction
The objects' masses and the distance between them are the 2 factors that gravitational attraction.
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