# Forces and Motion

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Forces and Motion Vocabulary Review

### Force

is a push or a pull

### Newton (N)

the unit for force

### Balanced Forces

equal but opposite; occurs when the net forces on an object equals "zero" and the objects motion does NOT change

### Unbalanced Forces

when the net forces on an object does NOT equal "zero" and the objects motion does change

### Gravity

force of attraction between 2 objects; determined by the mass of the objects and the distance between them

### Weight

a measure of the force of gravity on an object's mass

### Mass

is the amount of matter or stuff in an object

### Friction

a force that acts in the opposite direction of motion

### Air Resistance

a fluid frictional force on falling objects that opposes gravity

### Speed

the rate in which an object moves: calculated by distance / time

### Acceleration

the change in velocity over a period of time

### Frame of Reference

used to determine if an object is in motion; the background object that you assume is stationary in order to compare it to an moving object

### Newton's 1st Law of Motion

an object at rest will stay at rest and an object in motion will stay in motion until an outside force acts upon it

### Newton's 2nd Law of Motion

explains the relationship between acceleration, mass and force; Force=Mass x Acceleration

### Newton's 3rd Law of Motion

for every action there is an equal and opposite reaction

### Motion

caused by unbalanced forces acting on an object

### Velocity

speed in a certain direction

### Electric

force caused by non-moving charges

### Magnetic

force caused by moving charges

### Centripetal

it causes objects to travel in a circular path

### Applied

a force exerted on an object by a person or another object

### Normal

the support force exerted upon an object that is in contact with another stable object

### Tension

force that is transmitted through a string, rope, cable or wire when it is pulled tight by forces acting from opposite ends

Example: