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Velocity & Acceleration
Speed is how fast you're going with no regard to the distance eg 30mph or 20m/s.
Velocity is how fast you're going in a certain direction eg 15mph north or 46m/s 060°.
Acceleration is how quickly your speeding up and how quickly the velocity is
changing eg 0.84m/s².
speed(m/s)= time(s)
change in velocity(m/s)
acceleration(m/s²) = time taken(s)…read more

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DT & VT Graphs
Distance Time Graphs
· gradient = speed
· flat sections are where it's stopped
· steeper the graph the faster it's going
· downhill sections mean it's going backwards
to the start
· a steepening curve means its accelerating
· a leveling off curve means its decelerating
Velocity Time Graphs
· gradient = acceleration
· flat sections represent steady speed
· steeper the graph the greater the
acceleration or deceleration
· uphill sections are acceleration
· downhill sections are deceleration
· the area under any section of the graph or all
of it is equal to the distance traveled in that
time interval
· curve means changing acceleration…read more

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Mass Weight & Gravity
Gravity is the force of attraction between all masses
· gravity attracts all masses
· on the surface of a planet, it makes all things accelerate towards the ground
· it gives everything weight
· it keeps planets, moons and satellites in their orbits, the orbit is a balance between
the forward motion of the object and the force of gravity pulling it inwards
Weight & Mass
· mass is the amount of stuff in an object
· weight is caused by the pull of gravity
· an object has the same mass anywhere in the universe but its weight will vary
depending on the force of gravity
· weight is a force measured in newtons using a spring balance of newton meter
· mass is not a force and is measured in kilograms using a mass balance
weight(n) = mass(kg) x
gravitational field strength(n/kg)…read more

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Laws of Motion
First Law
An object at rest will remain at rest unless acted on by an unbalanced force. An object in
motion continues in motion with the same speed and in the same direction unless acted upon
by an unbalanced force.
· in the absence of an unbalanced force, objects will keep on doing what they're doing
· objects resist changes in their state of motion
Second Law
Acceleration is produced when a force acts on a mass. The greater the mass of the object
being accelerated the greater the amount of force needed to accelerate the object.
· heavier objects require more force to move the same distance as lighter objects
· overall unbalanced force is often called the resultant force
· an unbalanced force will always produce acceleration or deceleration
· it can take 5 different forms: starting, stopping, speeding up, slowing down, changing direction
· resultant force(n) = mass(kg) x acceleration(m/s²)
Third Law
For every action there is an equal and opposite re action.
· every force there is a reaction force that is equal in size but opposite in direction
· when you push an object it pushes you back…read more

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