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Give one example of a simple machine
screw, inclined plane, lever, pulley, wedge, wheel & axle
What is the purpose of a simple machine?
to make work easier to do
Watts is the unit for what?
power
What is the formula for power?
work / time
Joules is the unit for what?
work
What is the formula for work?
force x distance
Newtons is a unit for what?
force
Newton's Third Law of Motion
Every action has an equal yet opposite reaction.
Newton's Second Law of Motion
Force = mass x acceleration
Newton's First Law of Motion
An object in motion will stay in motion (An object at rest will stay at rest) unless acted on by an unbalanced force
two unequal forces are pushing on each other and there is a change in motion
unbalanced force
two equal forces are pushing on each other and there is no change in motion
balanced force
a push or pull on an object
force
m/s/s is the unit for what?
acceleration
m/s is the unit for
speed or velocity
When an object changes direction, is it accelerating?
Yes, because velocity (which includes direction) is changing
When an object slows down, is it accelerating?
Yes, because velocity is changing.
change in velocity over time (velocity / time)
acceleration
distance / time - What is this a formula for?
speed
is velocity a scalar or vector quantity
scalar (magnitude and direction)
is speed a scalar or vector quantity
scalar (only magnitude)
When are distance and displacement equal?
when motion is in a straight line
the total length an object has traveled between the starting point and ending point (doesn't have to be a straight line)
distance
the difference between the starting point and ending point of an object (a straight line)
displacement
a change in position over time
motion
3 things that a position must include
distance, direction, reference point
an object's distance and direction away from a reference point
position
the starting point you choose to describe the location, or position of an object
reference point