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# Chapter 5 test

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
Created by: kfran0112