NEWTON'S LAWS OF MOTION

FIRST LAW OF MOTION

• Objects at rest will stay at rest until a unbalanced force is acted upon it.
• Objects in motion will stay in motion until an unbalanced force is acted upon it.
• Ex: a rock laying on the ground & you kick it.

INERTIA

• Energy must overcome inertia to stop an object.
• The more mass an object has, the greater the inertia.
• Objects will resist change in motion.

BALANCED & UNBALANCED FORCES

• Balanced forces will cause an object at rest to stay at rest.
• Balanced forces will cause an object in motion to stay in motion.
• Unbalanced forces is when all the forces acting on an object are not equal.
• Acceleration is cause be unbalanced forces: slow down, speed up, stop, start, change direction, change shape.
• Ex: a seesaw with an elephant and a mouse on it.

SECOND LAW OF MOTION

• F=ma
• The greater the mass of an object the more force it'll take to stop it.
• Change of motion depends on force and mass.
• Momentum- strength of an objects motion.
• Ex: a car traveling at a certain speed and another force trying to stop it.

f=MA

• The equation f=ma explains the relationship between force, mass, & acceleration.
• It indicates that F(force) is equal to M(mass) x A(acceleration)

CENTRIPETAL FORCE

• Centripetal force is a force that acts on a body that is moving in a circular path and it's directed towards the center around which the body is moving.
• Centripetal force means "center seeking" force.
• An example of centripetal force would be a car driving in a circle and the force is directed towards the middle.
• The motion of centripetal force is directed towards the center also called, the axis of rotation.

THIRD LAW OF MOTION

• For every action there is an equal and opposite reaction that takes place.
• This is NOT a cause and effect because the action and reaction happen at the exact same time.
• Ex: when you push off a wall in a swimming pool, the reaction is when you are pushed off of the wall.
• It happens at the same time, not a second or two later.

FORCE PAIRS

• There is a force acting on the pair of forces.
• The size of the force equals the size of force on the second object.
• The force on the first object is opposite on the second object.
• Ex: a fish uses it's its fins to push back on water in order to swim.

CREDITS

• www.physicsclassroom.com
• www. Science.howstuffworks.com
• www. Studyphysics.ca
• www.eschooltoday.com