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speed:the distance by an object in one unit of time
you need to be able to use the three main unit of speed
Distance: speed x time
time: distance divided by speed
speed:distance dived by time
force: causes a stationary object to move
push & pull: tends to move an object or make it go faster or change direction
lubrication:used to reduce friction between two surface in contact
disadvantages of friction
your foot rubbing against the shoe
you need more fuel {friction uses a lot of fuel}
sole of your shoe wears out
compression:crushing a can
electric:tends to move charged particles
magnetic:picking up magnet materials
weight
weight is a force
measured in Newtons
weight has direction
the weight of an object can charge
weight=mass x10
