# Physics Final

## 34 terms · This covers: Relative position & motion, speed and velocity, acceleration, newton's laws of motion, types of forces, systems of forces, and pressure.

### Relative Position, Accurate or Precise?

The location of an object in relation to the position of another object, Accurate.

### Vector

A measurement incorporating size and direction.

### Coordinate System, Accurate or Precise?

The determination of location based on a numbered grid, Precise.

### Speed

A measure of how fast something moves through a particular distance over a definite time period.

### Average Speed

A measure of the distance traveled in a given period of time.

### Instantaneous Speed

Speed at a particular instant in time.

### How can you find speed if you're given distance and time?

Distance divided by time.

### How can you find distance if you're given speed and time?

Speed multiplied by time.

### How can you find time if you're given speed and distance?

Distance divided by speed.

### Velocity

A speed in a specific direction.

### Acceleration

The rate at which an object's velocity changes with time.

### How can you calculate acceleration?

Final Velocity minus Initial Velocity divided by Time.

9.8 m/s squared.

### Newton's 1st Law of Motion

An object at rest will stay at rest and an object in motion will stay in motion unless acted upon by an unbalanced force.

### Newton's 2nd Law of Motion

Force is equal to an object's mass multiplied by its acceleration.

### Newton's 3rd Law of Motion

For every action there is an equal and opposite reaction.

### How can you find force if you're given mass and acceleration?

Mass multiplied by acceleration.

### How can you find mass if you're given force and acceleration?

Force divided by acceleration.

### How can you find acceleration if you're given mass and force?

Force divided by mass.

### Gravity

Force that causes attraction between masses.

### According to Newton, what two factors influence gravitational attraction between two objects?

Proximity and Mass.

### How can you calculate the weight of an object?

Mass (kg) multiplied by acceleration due to gravity.

### Contact Force

Force between two objects; a push or a pull.

Speed up.

### Acceleration in an opposite direction to motion causes an object to:

Stop, slow down, or reverse direction.

### Acceleration in the an angle to motion causes a:

Change in direction.

### Friction

The resistance between objects moving against each other.

### Factors that influence friction:

Pressure, Surface Area, and Type of Surface.

### Air Resistance

The fluid friction due to air. An object with greater surface area will encounter increased air resistance. There is a direct relationship between velocity and air resistance.

### Net Force

The directional sum of all forces acting on an object.

### Balanced Forces

Equal forces acting against each other resulting in no motion.

### Unbalanced Forces

Unequal forces acting against each other resulting in motion.

### Pressure

A measure of how much force is acting on a certain area.

### How can you calculate the pressure that an object exerts on a surface?

Force (N) divided by Area (m squared)

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