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Forces
Friction
Random
Newton's laws
Speed & Velocity
100
what is force?
a push or pull that acts on an object
100
What is friction?
force that opposes the motion of objects that touch as they move past each other
100
What is gravity?
a force that acts between two masses
100
True or False an object in motion will stay in motion
true
100
What is speed?
the ratio of distance moved divided by the amount of time it took
200
How is force represented?
direction and strengh
200
What is static friction?
a force that acts on objects that are not moving
200
Earth's ____________ keeps the moon in an orbit around the earth.
gravitational force
200
How many laws are there?
three
200
the description of speed and direction of motion
What is velocity?
300
How is force measured on a spring scale?
How is force measured on a spring scale?the stretch of the spring depends on the mass of the object acting on it
300
What is sliding friction?
a force that opposes the direction of motion of an object as it slides over a surface
300
A strong nuclear force acts only on what?
neutrons and protons
300
What is Newton's second law of motion?
the acceleration of an object is always in the same direction as the net force
300
If you say "A bird is going 30 miles per hr east" you are saying it's ___________.
velocity
400
Forces in the same direction are added or subtracte?d
added together
400
a change in shape at the point of rolling contact
What is rolling friction?
400
What is Law if Inertia.
Newton's First Law of Motion is also called:
400
Which law is an object at rest stays at rest and a object in motion stays in motion at the same direction and speed(until something acts on it)
newton's first law
400
What is the SI unit for speed
meters per second (m/s)
500
Forces in the opposite direction are added or subtracted?
subtracted
500
What is fluid friction?
What is fluid friction?opposes the motion of an object through fluid
500
What is 0 N.
How big is the net force acting on an object with constant velocity?
500
What is Newton's third law of motion?
every action has an opposite and equal reaction
500
What is the displacement of an object divided by it's time
acceleration