Forces and Motion Notes. Force- a push or pull on an object or by an object. Examples: pushing a pencil to write lifting a book lifting a book throwing.

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Presentation transcript:

Forces and Motion Notes

Force- a push or pull on an object or by an object. Examples: pushing a pencil to write lifting a book lifting a book throwing a ball throwing a ball swinging a bat swinging a bat

Vector- an arrow that shows the direction and strength of a force. Longer= stronger ….A long arrow shows a strong force.

Net Force- total force exerted on an object.

2 equal forces in opposite directions Cancel each other out Object does not move. Net force=zero. Balanced Forces in opposite directions-

Forces in opposite directions. Object moves in direction as the strongest force. Net force is the difference of the forces. Unbalanced Forces in opposite directions-

Unbalanced Forces in same direction- Forces act together in the same direction Net force is the sum of the forces.

Friction- when 2 objects rub together and the force of 1 object is exerted on the other. Friction acts in opposite direction as the objects movement.

Inertia- tendency of an object to resist change in motion Example: A pencil will sit on your desk indefinitely if it never experiences a change in forces. A meteoroid will continue its motion in space unless it runs into something or gets pulled in by Earth’s gravity. A meteoroid will continue its motion in space unless it runs into something or gets pulled in by Earth’s gravity.

Newton’s First Law of Motion- An object at rest or in motion will not change unless acted upon by an unbalanced force.