18 terms

# Glencoe Physical Science Chapter 3: Force and Newton's Laws

#### Terms in this set (...)

field
Any region in which a physical quantity, such as force, is present at every point.
force
A push or pull exerted on an object
net force
The sum of all the forces acting on an object.
friction
A force that opposes motion between two surfaces that are in contact
gravity
A force of attraction between objects that is due to their masses.
weight
A measure of the force of gravity on an object
acceleration
The rate at which velocity changes
mass
A measure of the amount of matter in an object
Newton's first law of motion
An object will maintain a constant velocity unless an unbalanced force acts upon it.
Inertia
The tendency of an object to resist a change in motion.
Newton's second law of motion
The acceleration experienced by an object is in the same direction as the net force applied and is equal to the force applied (N) divided by the mass (kg).
Newton's third law of motion
When an object exerts a force on a second object, the second object will exert an equal and opposite force on the first.
momentum
A quantity defined as the product of the mass and velocity of an object
air resistance
Friction like force which opposes an objects motion through air. Increases with surface area of the object.
terminal velocity
The greatest velocity a falling object can achieve prior to air resistance balancing the force of gravity.
free fall
State in which an object only experiences the force of gravity.
centripetal force
Force which causes centripetal acceleration. IE force which causes an object to move in a circle.
law of conservation of momentum
In the absence of an external force, the momentum of a system remains unchanged
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