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# Benchmark 3 Review

### Benchmark Review

Energy of motion Kinetic Energy
To increase kinetic energy Increase mass and velocity
Rubbing your hands together friction converts Mechanical energy into thermal energy
A rolling bowling ball has kinetic energy
Stored energy Potential energy
Potential energy that depends on height Gravitational potential energy
A change from one form of energy to another Energy transformation
When two forces act in the same direction They are added together
The tendency to resist change in motion inertia
The greater the mass of an object The greater its inertia
The force of gravity pulling on an object Weight
To increase acceleration Decrease mass
The force that one surface exerts on another when they rug against each other Friction
Air resistance is a type of Friction
Forces are added Only when they act on the same object in the same direction
The amount of matter in an object Mass
Objects falling through air have a type of friction called air resistance
Balanced forces never change an object's Motion
When the distance between two objects is changing It is in motion
Speed equals distance divided ty time
Speed in a given direction Velocity
The rate at which velocity changes is Acceleration
A place or object used for comparison Reference point
If speed does not change the speed is constant
Object moving in the same direction at a constant speed did not change Velocity
Heat transferred from particle to particle without the movement of matter itself conduction
The transfer of energy by electromagnetic waves radiation
Heat transfer occurs only from warmer to cooler ones
Warm air rises from an bonfire by convection
Total distance divided by total time Average speed
If two objects travel at the same speed, they can have different velocities if they travel in different directions
Force that pulls falling objects toward Earth gravity
Acceleration is the change in speed per unit time
A factor that affects acceleration: (a = f/m) force
A motor heats up when it runs because some energy is lost as heat due to friction
Gasoline in a car is converted to mechanical, heat and sound energy
The transfer of energy from the sun is Radiation
Warmth from a fireplace is due to radiation
Created by: CMoody