Science Chapter 2 Momentum Test

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Terms in this set (...)

Force
Described by its strength and by the direction in which it acts
Nonzero Net Force
Causes a change in an object's motion
Force
A push or a pull
Force
Measured in Newtons
Net Force
The combination of all the forces on an object
Net Force
Determines if and how an object will accelerate
Type of Surface and how hard the surfaces are pushed together
Two Factors that affect friction
Sliding Friction
Occurs when two solid surfaces slide over each other. Makes moving objects slow down and stop.
Static Friction
Acts between objects that aren't moving
Fluid Friction
Occurs when a solid object moves through air or water
Rolling Friction
Occurs when an object rolls across a surface.
Mass and Distance
Two factors that affect gravitational attraction between 2 objects
Smooth Surfaces
_______ produce less friction than rough surfaces
Friction
_____increases when surfaces push harder against each other
Friction
_____acts opposite to the direction of the object's motion.
Gravity
a force that pulls objects toward each other
Law of Universal Gravitation
states that that force of gravity acts between all objects in the universe that have mass.
Mass
Any two objects in the universe that have ____ attract each other
A Gravitational Force
exists between any two objects in the universe
Mass and Distance
two factors that affect the gravitational attraction between objects
Weight
measure of the force of gravity on an object
Newton's First Law of Motion
Objects at rest will remain at rest and objects moving at a constant velocity will continue moving at a constant velocity unless they are acted upon by nonzero net forces.
Newton's Second Law of Motion
The acceleration of an object depends on its mass and on the net force acting on it.
Newton's Third Law of Motion
If one object exerts a force on another object, then the second object exerts a force of equal strength in the opposite direction on the first object.
Inertia
Resistance to change in motion
Equal and Opposite reaction
Every action has an ________________
Acceleration Decreases
If mass increases and force stays the same, __________
Outside forces act on the objects.
The total momentum of any group of objects remains the same, or is conserved, unless _______
Momentum
a characteristic of a moving object that is related to the mass and velocity of the object
Momentum
described by both a direction and a strength
Law of Conservation of Momentum
in the absence of outside forces like friction, the total momentum of objects that interact does not change.
Non Sticky collisions
Objects trade velocities.
Sticky Collisions
The objects share momentum, and the total momentum of the two stays the same.
Free Fall
a motion where the acceleration is caused by gravity
Free Fall
When the only force acting on an object is gravity, the object is in _____
Air Friction
_______ increases as an object falls
Centripetal Force
causes an object to move in a circular path
Newton's first law of motion
Law of Inertia
Newton's second law of motion
F = ma
Newton's third law of motion
Action and Reaction
Unbalanced Forces
when the total is nonzero
Balanced Forces
When the net force equals zero