physic - gravity and motion

• Created by: Millie p
• Created on: 04-02-17 11:29
what units can speed be mesured in
miles per hour ,kilometres per hour ,metres per secound
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why are they mesured in different units
because they are for differnt distances
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how do u calculate speed
distance x time
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what is called when there is a cahnge of speed
deaccleration and accleration
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how do u work out accleration
change in speed (m/s) divided by time taken -s
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large accerleration =
large change in speed
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change in speed formulae
accleration x time
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abby drives at 10m/s she acclerates at 4m/s 2 for 3 secs what speed does she reach
22m/s
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force formulae
mass x accleration
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mass is
material
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balanced forces make a moving object travel at a
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how do u make an moving object acclerate or deacclerate
unbalanced fdorces .will make the moving object accerlatre or deacclerate in the direction of the resultant force
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name the forces on a still object
gravity upthrust( air resistance)
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how can mass effect accleration
the greater the mass the greater the force
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accleration x mass
force
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gravity on earth is
10n/kg
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how do u work out a moment
force x distance from pivot
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the pivot
doesnt move in space
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what is a moment
the turning effect of a force
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the moment is bigger if
the force is larger ,larger distance from pivot
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for turning forces on an object are balanced there must be the same clockwise moments as there are
anti clockwwise moments
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the drag is bigger
the fater you move
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what direction does gravity pull us on earth
down - towards the centre of the earth
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the mass of an object changes
the amount of gravity
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which of these has the most gravity earth sun moon
1) SUN 2) EARTH 3) MOON
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WHY IS THERE NO DOWN IS SPACE
because there is no gravity
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the further you are away from the earth the
weaker the gravity
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how do we orbit the sun
we are attraracted to the sun by gravity
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what is weight
mass x gravity
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what is the gravity at the centre of the earth
0 because forces are balanced
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further you are towards the centre the gravity becomes weajker
true
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which palnet is the force of gravity betweween the sun the weakest
pluto - because its the furthest away
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a planet wich has more gravity would make ypu weight
bigger
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how do satlites saty in there orbits
grvaity - they have to be the perfect distae from the arth this means the gravity wont pull them to earth but they wont fly out to space either
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Other cards in this set

Card 2

Front

why are they mesured in different units

Back

because they are for differnt distances

Card 3

Front

how do u calculate speed

Card 4

Front

what is called when there is a cahnge of speed

Card 5

Front

how do u work out accleration