36 terms

Physics Review

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Terms in this set (...)

Mass
The amount of matter in an object; SI unit for measuring mass is the kilogram.
Inertia
A body at motion stays in motion unless acted on by an outside force and a body at rest stays at rest.
Momentum
Mass in motion; a measure of how hard it is to stop the object (p = m*v ---- kg x m/s).
Law of Conservation of Momentum (net momentum before = net momentum after)
In the absence of an external force, the momentum of a system remains unchanged.
Weight
A measure of the force of gravity pulling down on your body; unit for measuring weight is the Newton.
Elastic collision
Two objects bounce off each other.
Inelastic Collision
Two objects sticking to each other.
Friction
Force that opposes motion between two surfaces.
Gravity
Force that pulls all objects together
"closer the objects, the harder the pull"
"greater the mass, larger the pull"; acceleration due to gravity is 9.8 m/s/s on earth (if it weren't for air resistance).
Velocity
The speed of the object and the direction of its motion.
To increase impulse
Increase Force and contact time
To calculate momentum
mass x velocity
To calculate impulse
Force x time
To calculate velocity of objects after a collision
net momentum before = net momentum after
Why does the ball have less momentum if you do not follow through?
Decreased contact time
Newton's first law
law of inertia
Newton's second law
acceleration is directly proportional to force and inversely proportional to mass
Newton's third law
action and reaction forces are equal and opposite
Force
A push or a pull
Static friction
Greater force due to the "clinging" of molecules
Sliding friction
Lower force due to the object already being in motion
Free fall
motion of an object with only the force of gravity
Acceleration
Change to an objects motion over an amount of time
vector
includes magnitude and direction
scalar
includes magnitude only
Kinetic energy
energy of an object that is in motion that allows the object to do work
Potential energy
energy of an object due to its position
weight (m x g) x height
gravitational potential energy equation
1/2 m x v ^2
kinetic energy equation
Work
change in energy due to a force being applied to more an object a distance
Thermal energy
due to friction, transformed from KE
Power
work done per an amount of time
F x d
work
W / t
power
Unit of energy and work
Joules
Unit of power
Watts

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