31 terms

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formula for speed:velocity:acceleration:momentum:average speed
speed= distance/time. velocity= a speed in a given direction. Acceleration= final velocity- initial velocity/time. Momentum= mass x velocity. average speed= total distance/total time.
what is the unit for acceleration?
meters/s/2? with a direction.(ex.north)
what is circular motion?
acceleration that occurs in a circular motion
reference point:
an object used to compare motion
what is the rate that all objects fall at?
9.8 meter per second 2 until they reach terminal velocity'
what is the unit of force?
newtons, 1N= 0.2247 lbs. . 1 lb.= 4.45N
how do we make an object move?
apply force. force can make an object balanced or unbalanced.
what does it mean when forces are balanced?
the forces are equal and oppisite.
equilibrium:
balance,
net force:
a sum of all forces. forces in the same direction you add. opposites=subtract.
wha happens when there is a rough surface>?
greater friction. the greater the force, the more friction you have.
4 types of friction
sliding, rolling, static, fluid
what is the law of universal gravitational force?
part 1: gravitatiol forces increase as mass increase, part2: gravitational forces decrease as distance increases.
momentum:
all moving objects have_____. the more an obect has the harder it is to stop it,
motion:
an objects change in position over time compared with a reference point
speed:
the rate at which an object moves
velocity:
the speed of an object in a given direction
acceleration:
the rate at which velocity changes, an object accelerates if its sped changes.direction,or both. the more mass the more acceleration
force:
a push or pull. all forces have both size and direction
newton:
the SI unit of force
gravity:
a force of attraction between objects that is due to there masses
friction:
a force that opposes motion between 2 surfaces that are touching
weight:
a measure of gravitational force exerted on an object, the force of gravity pulling you down is the earth
mass:
the amount of matter that something is made of. a measure of inertia
what is the 1st rule of physics?
things like to keep on doing what there doing.
inertia:
laziness
what does inertia depend on?
it depends on the mass of an object
what does force varrie with
mass and change of speed
why do things fall down'?
the force of gravity
why does friction occur?
because the surface of any object is rough
name 2 ways in which friction can be increased
a rougher surface and more force