# Matter in Motion

### 20 terms by twihardgleek

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### Force

A push or pull extorted on an object in order to change the motion of the object; force has size and direction

### Net Force

Combination of all the forces acting on an object

### Inertia

Tendency of an object to resist any change in motion or a moving object resisting motion until another force acts on it

### Friction

A force that opposes motion between two surfaces that are in contact

### Mass

A measure of the amount of matter in an object

### Weight

A measure of the gravitational force exerted in an object; can change

### Terminal Velocity

Constant velocity of a falling object when the force of air resistance is equal to the magnitude and direction of gravity

### Gravity

Force of attraction between two objects due to their masses

### Air Resistance

Force that opposes motion of objects through air

### Newton

SI unit for force

### Free Fall

The motion of a body when only the force go gravity is acting on the body

### Projectile Motion

the curved path that an object follows when thrown, launched, or otherwise projected near the Earth's surface

### Newton's 1st Law

An object at rest remains at rest and an object in motion remains in motion at a constant speed in a straight line unless disturbed by an unbalanced force

### Newtons 2nd Law

The acceleration of an object depends on the mass and force applied

### Newton's 3rd Law

Whenever one object exerts a force on the second, the second object exerts an equal and opposite force on the first

### Balanced

When the net forces produce 0 N; do not cause a change in the motion of a moving object and don't cause nonmoving to move

### Unbalanced

When the net force is not 0 N; produce a change in motion such as speed or direction, necessary to cause a nonmoving to move

### Motion

An objects change in position relative to a reference point

### Momentum

a quantity defined as the product of the mass and velocity of an object

### Law of conservation of Momentum

Any time objects collide the total amount of momentum stays the same

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