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Newton's Law (TYPES OF FORCES (torque -- changes rotation of an object…
Newton's Law
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LAWS OF MOTION
- objects with balanced forces acting on them will stay at rest or stay in constant motion
Newton discovered that objects will continue to do what they are doing until an unbalanced force acts on the object
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example: sliding a hockey puck on ice will eventually stop because there is friction on ice. It will also stop if it hits something, like a player's stick or goalspot
- f (force) = m (mass) x a (acceleration
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example: riding a bike. the mass is the bike, and the force is our leg muscles pushing the pedals of the bike is the force. When we push on the pedals, the bike accelerates. We are increasing the speed of the bike by applying force to the pedals.
example: jumping. When we jump, our legs apply a force to the ground, and the ground applies an equal and opposite reaction force that launches us into the air
WEIGHT AND MASS
Weight is not the same as mass. Mass is a measure of how much matter is in an object. Weight is a force acting on that matter. Mass resists any change in the motion of objects
In physics, the term weight has a specific meaning - which is the force that acts on a mass due to gravity. Weight is measured in newtons. Mass is measured in kilogram
The mass of a given object is the same everywhere, but its weight can change. We use balances to measure weights and masses
FRICTION
When two surfaces slide past each other, the interaction between them produces a force of friction
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DEFINITION
A force causes an object to undergo a specific change. Unbalanced forces cause changes in speed, shape, or direction. Gravitational force acts between masses. Friction opposes motion.