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Motion & Forces

What is used for comparison to determine if something is in motion? reference point
What is speed in a given direction? velocity
What is the distance an object travels in one unit of time? speed
What occurs when something's reference point is changing? motion
What occurs when the velocity of an object changes? acceleration
A push or a pull is a _______ force
What is the force that accelerates objects towards earth? gravity
A measure of force of gravity on an object is _______ weight
What is the tendency of an object to resist a change in motion? inertia
What is the product of an object's mass and velocity? ( Mass x Velocity ) momentum
What is the general term for the force that one object exerts on another when they rub against each other? friction
_______ forces can change an object's motion. unbalanced
_______ friction is the kind of friction that slows a falling object. fluid friction
The amount of inertia an object has depends on its ________. mass
A falling object reaches ________ when forces of gravity and air resistance are balanced. terminal velocity
If you increase the mass of an object, its acceleration ________. decreases
A child riding a merry-go-round is accelerating because his direction is _______. changing
Friction depends on the types of surfaces involved and how _______ the surfaces push together. hard
_______ friction is the friction that acts on objects that are not moving. static
_______ friction is when two solid surfaces slide over each other. sliding
_______ friction is when an object rolls across another surface. rolling
_______ is when the only force acting on an object is gravity. free fall
States that an object at rest will remain at rest, and an object moving at a constant velocity will continue moving at a constant velocity, unless it is acted upon by an unbalanced force. Newton's first law of motion
States that acceleration depends on the object's mass and on the net force acting on the object. Newton's second law of motion
States if one object exerts a force on another object, the second object exerts a force of equal strength in the opposite direction on the first object. Newton's third law of motion.
The Law of ______ of ______ is the total momentum of any group of objects remains the same , or is conserved, unless outside forces act on the object. conservation of momentum
What is the force that causes an object to move in a circular path? centripetal force
Created by: redskinsman3