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30 Cards in this Set
- Front
- Back
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Motion
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occurs when an object changes its position relative to its surroundings.
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distance
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an object travels is the space between two points.
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frame of reference
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motion is observed and meassured any set of point,lines,or planes from which coordinates can be measured
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speed
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of an object is the distance the object travels in a given time
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average speed
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s=d/t
s=100m/20s s=5m/s |
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instantaneous speed
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the speed of an object at a particular instant
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velocity
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is speed in a particular direction
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acceleration
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the rate at which the velocity of an object changes
a=cv/t=Fv-iv/t a=15m/s-0m/s/8s a=1.9m/s2 |
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inertia
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is the tendency of an object to resist any change in motion
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net force
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is the sum of the force acting on an object
net force=mass x acceleration f=m x a f=1n |
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acceleration due to gravity
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in the absence of air resistance, however, all freely falling objects have the same acceleration
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FREE FALL
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WHEN gravity is the only force acting on a falling object
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weightless
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freely falling object
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momentum
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is = to an object's mass multipled by its velocity
p=m x v p=___kg x m/s |
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projectile motion
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is the motion of an object thats move under the influence of gravity alone
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trajectory
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the curved path a projectile follows
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uniform circular motion
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refers to motion with constant speead around a circle
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centripetal force
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force that causes an object to move in a circle
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work
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IS DONE WHEN WHEN A FORCE MOVES AN OBJECT OVER A DISTANCE
W+ F X D |
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joule
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one j equals a force of 1n moving an object a distance of i m. a joule is = to n x m
w=f x d w=___j |
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energy
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the ability to do work
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potential energy
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stored energy
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gravitational potential energy
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potentia energy due to an object's positions relative to the ground
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kinetic energy
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is the energy of motion
kinetic energyy = 1/2 mass x speed2 ke=1/2mv2 |
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laws of conservation of energy
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that energy can be changed from one form to another, the total amount stay the same
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power
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is the rate at which work is done
power = work/time p=w/t p=___w |
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watts
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a watt is equal to a joule per second (j/s)
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machine
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any tool that help to do work
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simple machine
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is one that does work in one movement
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lever
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is a rod or bar that pivits around a point
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