A force that opposes movement between two surfaces that are in contact.
What is friction?
100
in circular motion, this force is perpendicular to the velocity and toward the center of the circle.
What is centripetal force?
200
Distance divided by time
What is the equation for speed?
200
the steepness of a line
What is slope?
200
A force that is exerted only when 2 objects are touching.
What is a contact force?
200
an attractive force that exists between all objects that have mass.
What is gravity?
200
all objects are attracted to each other with a force that depends on the masses of the objects and the distance between them
What is the Law of Universal Gravitation?
300
An object that travels the same distance each second.
What is traveling at constant speed?
300
change in vertical direction
What is rise?
300
the combination of all the forces acting on an object
What is the net force?
300
State the First Law of Motion
An object at rest remains at rest, and an object in motion remains in motion at a constant speed and in a straight line until acted upon by an outside force.
300
Why do you speed up when you fall?
What is gravity?
400
total distance divided by total time
What is average speed?
400
the change in horizontal direction
What is run?
400
occurs when the net force is not zero. Motion occurs.
What are unbalanced forces?
400
State the Second Law of Motion
the acceleration of an object equals the net force divided by the object's mass. or Force = mass X acceleration.
400
_______________ exerted by the Sun is the centripetal force that keeps earth moving around the sun.
What is the gravitational force of the Sun?
500
the speed and direction of motion
What is velocity?
500
A change in acceleration can be
A) a change in speed.
B) a change in direction.
C) a change in either speed or direction.
D) I don't know cuz I wasn't listening.
What is C a change either in speed or direction.
500
Net force= 0
no motion
What are balanced forces?
500
State Newton's Third Law of Motion
When one object exerts a force on a second object, the second object exerts and equal and opposite force on the first object.
500
the gravitational force exerted on an object. Changes with position in the universe.