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

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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.

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

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

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

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

Net Force combination of all of the forces
determined by the directions of the forces shown by vectors

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

Net force Forces in the same direction: add the forces together
Forces in different directions: subtract the smaller force from the larger one

Balanced Forces net force = 0 no change in motion
an object at rest will stay at rest

Unbalanced Force Net force ≠ 0 change in speed change in direction
object at rest will move object moving might stop

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