Force & Newton's First Law
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Newton's First Law states that an object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force. Inertia is an object's resistance to changes in motion and is determined by its mass. Friction is a force that opposes the motion between two surfaces in contact and depends on factors such as the roughness of the surfaces and whether the object is moving or stationary. The net force on an object, which is the combination of all individual forces, determines whether its motion will change.
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Force & Newton's First Law
Editor's Notes
- electromagnetic, gravitational & atomic forces
- Lack of motion or lack of CHANGE in motion does not mean forces are not being applied.
- Acceleration = change in speed (faster or slower) or direction.
- drop a paper flat vs. vertical: less air molecule resistance when vertical, so it falls faster (less friction) Is it easier to slide across a hard, polished floor or carpet?
- drop a paper flat vs. vertical: less air molecule resistance when vertical, so it falls faster (less friction) Is it easier to slide across a hard, polished floor or carpet? * Adhesion can sometimes increase friction, esp. in fluids