# Motion and Forces

### 34 terms by 16norman

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a push or a pull

### Net Force

the force after the counteracting force

### Unbalanced force

whenever there is a net force acting on an object

### Balanced Force

equal forces acting on one object in opposite directions

### motion

object is in motion if its distance from another object is changing

### inertia

the tendency of an object to resist a change in motion or stay still

### Mass

a measure of the amount of matter in an object

### Newton (the unit)

The unit that measures the strength of a force (1 km in mass at 1 mile per second)

### Friction

the force that two surfaces exert on each other when they rub against each other

### Sliding Friction

when two solid surfaces slide over each other

### rolling friction

when an object rolls over a surface

### fluid friction

when a solid object moves through a fluid

### gravity

a force that pulls object towards each other

### weight

the force an object exerts on something toward the earth

### momentum

is a characteristic of a moving object that is related to the Mass and the Velocity of the objects

final speed

### Law of conservation of momentum

in the absence of outside forces, the total momentum of the object that hit each other does not change

### centripetal force

any force that causes an object to go in a circle

### theory of plate tectonics

earth's land masses have changed position over time because they are part of plates that are moving slowly

### Frame of reference point

A place or object used for comparison to determine if an object is in motion

### Acceleration and deacceleration

increasing speed or decreasing speed or changing direction

### Satellite

any object that orbits another object in space

### Velocity

speed and direction

distance/time

### Velocity

the speed and direction of an object's motion

### Acceleration

SF-SI/time or force/mass

mass*velocity

what you compare

### Experimental Group

what you base the experiment on

### Independent variable

what you change in an experiment

### Dependent Variable

What you measure (measurements)

### Newton's 1st Law of Motion

Objects at rest will remain at rest unless acted upon by an outside force.Objects in motion will remain in motion at the same velocity unless acted upon by an outside force.

A=force/mass

### Newton's 3rd Law of Motion

To every action there is an opposite and equal reaction.

Example: