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Laws of Motion 1
physics for 8th grade
Question | Answer |
---|---|
Newton's First Law of Motion | an object will remain at rest or move in a straight line with constant speed unless it is acted upon by a force |
What is the First Law of Motion called? | The law of Inertia |
What is a force? | a push or pull on an object |
balanced force | forces are in equal but opposite directions, they will cancel each other out |
unbalanced force | forces that do not cancel out |
Newton's Second Law of Motion | an object acted on by an unbalanced force will accelerate in the direction of the force with an acceleration given by Newton's Second Law of Motion equation |
gravitational force | between two objects depends on the masses of the objects and the distances between them |
Friction | a force that resists sliding motion between two surfaces that are touching |
Static Friction | keeps an object at rest from moving on a surface when a force is applied to the object |
sliding friciton | occurs when two surfaces slide past each other |
rolling friction | makes a wheel roll forward or backward |
air resistance | mollecules in air collide with the forward-moving surface of an object, slowing its motion down |
Newton's Third Law of Motion | forces act in equal but opposite pairs |