Question | Answer |
an objects change in position relative to a reference point | motion |
an object that appears to stay in place | reference point |
What are the reference directions? | North, South, East, West, Up, Down |
What is an example of a common reference point? | Earth's Surface |
the distance traveled divided by the time interval during which the motion occured | speed |
What is resultant velocity? | When you add two velocities that are going the same direction |
the speed of an object in a particular direction | velocity |
If something is traveling in a straight line, it has a --- velocity. | constant |
the rate at which velocity changes | acceleration |
increase in velocity= ----
decrease in velocity= ---- | positive acceleration
negative accleration |
the acceleration that occurs in a circular motion | centripal acceleration |
a push or a pull exerted on an object in order to change the motion of an object | force |
force has --- and --- | size and direction |
Can force change acceleration? | yes |
Can you see all forces? | no |
the combonation of all of the forces acting on an object | net force |
What does net force depend on? | direction |
when forces on an object produce a net force of 0N | balanced |
Will a balanced force change the motion of a moving object? | no |
When the net force on an object is not 0N | unbalanced |
Do unbalanced forces produce a change in motion? | yes |
a force that opposes motion between two surfaces that are in contact | friction |
Why does friction occur? | because the surface of object is rough |
What does the amount of friction depend on? | the force pushing them together |
If an object changes angle, does the amount of friction change? | no |
friction between two moving surfaces | kinetic friction |
what are the two types of kinetic friction? | sliding friction and rolling friction |
When force is applied to an object but the object doesnt move | static friction |
Give some examples of friction in real life | brakes on a bike, engine parts rubbing together |
substances that are applied to a surface to reduce friction | lubricants |
what is an example of a lubricant? | motor oil |