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# 18 Week Assessment

### Final Assessment

What determines how difficult it is to stop an object? momentum
The rate of change in velocity is called acceleration
What is used for a comparison when motion is described? frame of reference
The rate at which an object moves is its speed
Change in position in a certain amount of time is motion
Circular motion is an example of constantly changing velocity
Speed in a given direction is velocity
A negative acceleration is called deceleration
The velocity of an object changes if either its speed or its direction changes
Even when slowly moving a train cannot stop suddenly because of its large momentum
Speed that does not change is called constant speed
The Law of Conservation of Momentum states that energy cannot be lost or gained
Force is necessary to change direction / stop or start and object
Not an example of fluid friction? sugar
Friction produced by wheels or ball bearings is called rolling friction
What friction has the highest resistance? sliding friction
An object at rest will remain at rest is explained in Newton’s First Law
Newton’s Second Law of Motion relates to force, mass, and acceleration
Newton’s Third Law of Motion describes for every action there is an equal but opposite reaction
What is the value of gravitational acceleration? 9.8 m/s/s
Energy created when an object/medium is in motion. Examples include wind and flowing water mechanical
Energy created when individual atoms are rubbing against each other. Examples: fire and friction. heat
Energy created when chemical bonds between atoms are broken. There is chemical energy in food and batteries. chemical
Energy created from moving electric charges. Examples: lightning and x-rays. electromagnetic
Energy created when the nuclei of atoms split (fission) or fuse together (fusion). nuclear
Energy is the ability to do ______________________. work
Energy is measured in? joules
Energy of motion is called what? kinetic
This is the energy of position. Energy that is ready to be used. potential
Energy that exists for objects that are above the ground. Example: a rock on a cliff. gravitational potential
Created by: huizenga