# Physics vocab for Final

## 60 terms

A push or a pull

### Equilibrium

when the net force on an object is zero

### Newton's 1st Law

An object at rest remains at rest; and if in motion will remain in motion in a straight line; unless a force acts on it

### Gravity

This acts on a mass to create the force of weight

### newtons

The unit of measurement for force

### Net force

The sum of all forces acting on an object

### Constant velocity

If the net force on a moving object is zero its motion will be

### Inertia

An objects resistance to change its motion

### Support force

The force of the floor pushing back up against you

### Mass

An objects inertia depends on the amount of its

### Acceleration

The rate at which velocity is changing

### Vector quantity

Force, velocity, acceleration have both magnitude and direction so are

### Speed

distance travelled divided by time taken

### Free fall

when the pull of gravity on an object is unhindered

### Velocity

speed + direction

### Friction

The force that opposes the movement of an object

### Mass

The quantity of matter in an object

### Weight

The pull of gravity on an object's mass (mg=)

### Kilogram

The standard unit of measurement for mass

### Volume

The space an object occupies

A=F/m

### Force

This causes an object to accelerate

### Free fall

Falling at 10 m/s²

### Inertia

An objects resistance to change in its motion

### Terminal speed

falling when acceleration = 0

### Force

This is an example of a vector quantity

### Resultant

The sum of 2 or more vectors

Newton's 3rd Law

### Time

This is an example of a scalar quantity

### Momentum

An objects mass X its velocity

### Impulse

The force on an object X the time the force acts on it

### Elastic

Billiards is an example of these kinds of collisions

### Ship

An example of Mv (big M, Little v)

### Inelastic

A collision where the objects stick together

### Law of conservation of momentum

mV (before)= mV (after)

### Bullet

An example of mV (little m, big V)

### Conservation of energy

P.E + K. E. = constant

### Kinetic energy

A moving car is an example of this kind of energy

### Power

work done/ time taken=

### Efficiency

The measure of how little energy is wasted

### Lever

This kind of machine uses a fulcrum

### Potential energy

A lifted weight is an example of this kind of energy

### Work

Force X distance=

### Machines

Fd= Fd is the formula for all kinds of:

### Angular momentum

A rotating object's mass X radius X velocity=

### Centrifugal force

The apparent outward force acting on a rotating abject

### Center of gravity

An objects center of mass is located at the same place as its___

F X lever arm=

### Equilibrium

When the net force on an object = 0

### Centripetal force

The inward pulling force on a rotating object

### Conservation of angular momentum

A spinning ice skater pulling her arms in is an example of

### Rotational speed

RPM is the unit of measurement for

### Rotational inertia

The distance of the mass from the axis of rotation affects the objects

### Black hole

This is created when a star collapses

### Weight

An object pushes down on the floor with its____

Intensity 1/d²

### Tides

The pull of the moon's gravity causes this

### Gravitational field

The sun and the planets each have this around them

### Weightless

This condition exists when in free fall

Fg = G (M₁M₂)/d²