P4

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what is speed
distance covered in a certain time
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what is speed measured in
metres per second or kilometres per hour
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what is instantaneous speed
an average speed over a very short time
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what is the displacement of an object
distance from starting point
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what is velocity
speed in a particular direction
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on a distance time graph, what is the gradient
the steepness of the line, equal to the speed
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what is acceleration
the rate of speed increasing
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what is acceleration measured in
metres per second squared
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what is a distance time graph
a graph used to show a journey
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what is a speed time graph
a graph to show the changes in speed during a journey
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what is a velocity time graph
a graph to show the direction in which an object moves
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what is a force
a push or pull which acts between two objects
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what do forces always act in
pairs
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what is a repulsive force
pushes the objects apart
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what is an attractive force
pulls the objects together
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what does it mean if a force is a vector quantity
it has a magnitude and a direction
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how is a force represented on a diagram
by an arrow
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what is friction
a force that acts between two surfaces.
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what does the size of the friction force depend on
the roughness of the surfaces, how hard the surfaces are forces together
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what is limiting friction
when the friction reaces it's maximum value and the object starts to move
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what happens to the kinetic energy of the moving object
transfers to heat energy in both surfaces
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why is oil used in machinery
to reduce friction between machinery parts
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what is a resultant force
a combination of friction and the reaction of the surface. the total or overall force acting on an object
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why is friction needed in order to walk
foot pushed against the friction on the floor, the floor pushes foot up,
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what happens when the resultant force is zero
forces are balanced and there is zero acceleration
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where does the force of gravity act towards
the centre of the earth
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what is he force called that the atmosphere creates to slow down gravity
air resistance or drag
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when does drag increase
when the speed of the object increases
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what is an objects terminal velocity
a falling objects maximum speed
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wht does the size of the force depend on
mass of the object, speed of the object, duration of impact
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how do cars reduce forces in collisions
crumple zones, seat belts, airbags
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what is momentum
mass x velocity
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what is force equal to
the rate in change of momentum
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what iswork done
the energy used by the movement of a force
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what is energy/work measured in
joules
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what happens when work is done on an object
energy s transferred to that object
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what happens when work is done by an object
energy is transferred from the object to something else
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why is energy from food transferred into our bodies
so we can do exercise
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what happens when you life an object
you do work against gravity
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what is work transferred into when you lift an object
gravitational potential energy
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when does the GPE increase/decrease
when the object is raised/lowered
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what is work transferred into when you push an object to get it moving
kinetic energy into the moving object
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when does the kinetic energy of an object increase
when the object is heavier or moving faster
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what is the work done by an applied force equal too
the change in the kinetic energy
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what happens when there are no resistive forces
the total energy remains constant, known as the conservation of energy
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can energy be created or destroyed
no, it can only change form or transfer between objects
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when is energy usually used
when doing work against friction or air resistance, used up as heat
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what happens to the GPE when an object falls
it's potential energy is transferred into kinetic
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Other cards in this set

Card 2

Front

what is speed measured in

Back

metres per second or kilometres per hour

Card 3

Front

what is instantaneous speed

Back

Preview of the front of card 3

Card 4

Front

what is the displacement of an object

Back

Preview of the front of card 4

Card 5

Front

what is velocity

Back

Preview of the front of card 5
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