Ch.7 Law of Motion

Newton's first law

Newton's first law is things at rest stay, stay at rest, and thing in motion stay in motion, unless an outside force(unbalanced force) acts upon them

Balanced forces is forces acting on an object that combine and form a net force of zero are.

Unbalanced force is force acting on an object that combine and form a net force that is not zero.

Mass and Inertia

Mass: The size of something

Inertia: The tendency of an object to resist a change in its motion

Net force

Net force is the combination of all the forces acting on an object.

Reference Directions

Reference direction is when you describe an object's position, you compare its location to a reference direction. Positive and Negative are used to describe direction.

Newton's second law

Newton's second law is the acceleration of an object is equal to the net force acting on the object divided by the object's mass

F=M*A

Three Ways to Accelerate

1) Increasing speed

2) Decreasing speed

3)Changing in direction

Force acting on a moving object in the same direction vs. opposite direction

Force=Mass*acceleration

Newton's third law

Action-Reaction force pair (direction of forces and amount of forces

Force pair's one force is called the action force and the other is called the reaction force

In an action-reaction pair, the two forces never cancel each other, because each force act on a different object

Momentum is a measure of how hard it is not stop a moving object.

Momentum = Mass Velocity, P=MV(Equation of momentum)

Newton's third law is when one object applies a force on a second object, the second object applies an equal amount of force in the opposite direction

Law of conservation of momentum

Law of conservation of momentum is in any collision, momentum transfers from one object to another

Elastic Collisions: Cooling objects bounce off each other
Inelastic Collision: Objects collide and stick together (not moving)