NEWTONS LAW
Types
what do they do
Facts along the way
Laws of force
A force causes an object to undergo a specific change.
Unbalanced forces cause changes in speed, shape or direction.
Gravitational forces act between masses. Friction opposes motion.
A force is any influence that causes an object to undergo a specific change. Related concepts include:
air resistance - decreases the velocity of an object
torque - changes the rotation of an object
thrust - increases the velocity of an object
The Thrust supersonic car (ThrustSSC) was the first car to break the sound barrier when it was driven at 763 miles per hour in 1997. It has huge thrust and is streamlined to minimise air resistance.
Isaac Newton was an English physicist and mathematician. He determined that gravity was a force that acts between two masses. The larger the masses, the larger the gravitational force between them.
Charles-Augustin de Coulomb was a French physicist. He first described the electrostatic force. This is a force that acts between two charges.
Law 1. objects with balanced forces acting on them will stay at rest or stay in constant motion.
Law 2. when an unbalanced force acts on an object:
the direction of the object's acceleration is the same as the direction of the unbalanced force
the magnitude of the object's acceleration varies in direct proportion with the size of the unbalanced force
the magnitude of the object's acceleration varies inversely with the mass of the object
Law 3. For every action, there is an equal and opposite reaction.
Examples:
Examples:
Examples:
If you use the same force to push a truck and push a car, the car will have more acceleration than the truck, because the car has less mass.
If you slide a hockey puck on ice, eventually it will stop, because of friction on the ice.
when you jump, your legs apply a force to the ground, and the ground applies and equal and opposite reaction force that propels you into the air.
Friction, Weight, and Mass
When two surfaces slide past each other, the interaction between them produces a force of friction. Friction is a force that opposes motion.
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.
the force that acts on a mass due to gravity. Weight is measured in newtons. Mass is measured in kilograms.
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