Forces

how objects move

why objects move

A push or a pull on an object

• attractive force that exists between all objects
• weakest 
• ex. force of earth holds moon in orbit

• charged particles at rest/in motion they exert electrical/magnetic forces
• give materials their ability to bend, strength, etc.
• holds everything together

• holds the particles in the nucleus together
• strongest

a form of electromagnetic force involved in the radioactive decay of some nuclei

An object will maintain its constant velocity until a force acts upon it.

An object at rest stays at rest and an object in motion stays in motion unless acted upon by an outside force.

only dependent on mass; the tendency of an object to maintain it's motion

You drive your car without seat belts. At 40 mph you hit another car that ran a stop sign. The car slows down but you do not.

The acceleration of an object is directly proportional to the force on the object and indirectly proportional to the mass of the object

• F=ma
• As F increases, a will increase if mass stays the same.

As m increases, a will decrease if force stays the same.

• when one object exerts a force on a second object, the second object exerts a force on the first object that's equal in magnitude but opposite in direction.
• For every action, there is an equal (in magnitude) and opposite (in direction) reaction.

pushing on a wall. The action force in someone pushing on the wall. The reaction force is the wall pushing back on the person.