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Forces Any push or pull Forces • • • • • • • any push or pull wants to change the motion of an object has size has direction can change speed can change direction unit is the Newton Newton • metric unit of weight • = mass x force of gravity • = mass x 9.8 m/sec2 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
