Physics Unit 7: Explaining Motion: Study Guide
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16 Terms
Newton’s First Law
An object will travel in a straight line at a constant velocity unless an unbalanced or net force acts on it.
Force
A push or pull (F) Unit: Newton
Inertia
An objects resistance to change its motion
Common Forces
Friction, Normal Force, Tension, Weight
Friction
The force of a surface that opposes sliding. f
Normal Force
The force of a surface on an object that stops the object from falling through. Fn
Tension
The pull exerted by a string/rope when attached to an object. T
Weight
The pull of the Earth on an object. Fg
Agent
Thing creating the force on an object
Newton’s second law
Fnet=ma
Fnet
Sum of forces acting on an object
Mass
The measure of the amount of matter in an object
Weight
W=Fg=mg (g=9.8 m/s)
Weight vs Mass
Weight is a force while mass is a constant. Weight is Newtons and Mass is kg
Newton’s third law
For every action is an equal opposite reaction
Action and Reaction Force
Objects ones force on the second and vice versa
Note 
Flashcards (71)