Question | Answer |
Motion | An object is in motion if its distance from another object is changing. |
Reference point | An object used for comparison |
Speed and Velocity | Speed is distance over time. |
Average speed | total distance over total time |
Instantaneous speed | The speed at the exact moment |
Velocity | Speed in a specific direction |
x axis | Time |
slope | rise over run=distance over time=speed |
y axis | distance |
acceleration | Describes a change in velocity |
acceleration | can be an increase in speed, a decrease in speed, or a change in direction. |
acceleration | final speed over time |
Velocity | Describes a change in position |
Distance over time graph | has a curved line |
Velocity over time graph | has a straight line |
acceleration | rise over run=velocity over time= acceleration |
Point on a graph | piece of data |
slope | rate of change |
Friction | The force that two surfaces exert on each other when they rub against each other. |
Friction | acts in the direction opposite to motion |
Strength of friction | depends on how hard the surfaces push together and the types of surface involved |
static Friction | acts on an object that is not moving |
Sliding friction | acts when two solid objects slide over each other |
Rolling Friction | occurs when an object rolls over a surface |
Fluid Friction | occurs when a solid moves through a fluid |
Gravity | is a force that pulls object towards each other |
The law of universal gravitation | states that the force of gravity occurs between all objects in the universe |
Air Resistance | acts opposite to weight over gravity |
Air resistance | increase as surface area increases |
Air resistance | increase as velocity increasesh |