# Forces and Motion/Quarter 1 Material for Quiz and Final

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### Friction

a force that opposes motion

### Centripetal force

force that pushes an object into a circular path

### Force

Mass x Acceleration a push or pull

### Inertia

the tendency of a moving object to keep moving and the tendency of an object at rest to stay at rest

### Mass

amount of matter in an object
measured with balance, gram

### Weight

Gravitational pull on an object
mass x 9.8, Newtons

### G-Force

the force supplied by Earth's gravity

### Centrifugal force

an apparent force that pushes away from the center

### Gravity

(physics) the force of attraction between all masses in the universe

### Speed

a measure of how fast an object moves
=d/t

### Velocity

a measure of seed and direction
=d/t plus direction

### Acceleration

the rate at which velocity changes
=Final velocity-initial velocity/t

### Momentum

the force or speed with which something moves
Mass x velocity

### Average Speed

a rate of motion determined by dividing the total distance traveled by the total travel time

### Energy

the ability to do work

### Elastic Potential Energy

energy from an object that is stretched or compressed to increase/decrease the distance of its parts

### Gravitational Potential Energy

object's stored energy due to its position
=mgh

### Kinetic Energy

the energy an object has due to its motion
=1/2mv squared

### Conservation of Energy

energy can't be created or destroyed

### Newton's 1st Law

an object at rest or in motion will stay at rest or in motion unless acted on by an outside force

### Newton's 2nd Law

Acceleration of an object increases as the amount of force increases

### Newton's 3rd Law

Every action has an equal and opposite reaction force

unit of force

unit of energy

9.8m/s squared

### Efficiency

work input to work output

### Electron

negatively charged subatomic particle located outside the nucleus

### Proton

positively charged subatomic particle found in the nucleus

### Neutron

no charge, found in the nucleus

### Length

straight line distance between 2 points

### Volume

space an object takes up
liters

### Nucleus

the center of an atom. Always has a positive charge.

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