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Published byAlyson Sharp Modified over 8 years ago

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**A force is defined as a push or a pull that acts on an object.**

Forces A force is defined as a push or a pull that acts on an object.

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**Characteristics of a Force**

wants to change the motion of an object has size has direction can change speed can change direction

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**SI unit of Force= Newton**

A Newton is a metric unit of weight 1 Newton = 1 kg m/s2

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Force of Gravity Force of gravity is the downward force exerted by the earth on an object. Force = mass x acceleration due to gravity F= ma Acceleration due to gravity = 9.8 m/s2

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**Contact vs Non-contact**

Contact: there is contact between what is exerting the force and what is receiving the force Non-contact: the result is visible but you cannot see the contact between the force and the agent, example gravity

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**Net Force combination of all of the forces**

determined by the directions of the forces shown by vectors

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**Vector arrow attached to the receiver of the force**

length = magnitude of the force direction shown by the arrow head →, ↓, ↑, ←

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**Net force Forces in the same direction: add the forces together**

Forces in different directions: subtract the smaller force from the larger one

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**Balanced Forces net force = 0 no change in motion**

an object at rest will stay at rest

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**Unbalanced Force Net force ≠ 0 change in speed change in direction**

object at rest will move object moving might stop

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