Please enable JavaScript.
Coggle requires JavaScript to display documents.
Motion and forces (Distance, displacement , speed and velocity (Distance…
Motion and forces
Distance, displacement ,
speed and velocity
Distance is how far an object has moved
Displacement is how far an object
has moved in a direction
Speed is how fast you are going
Velocity is how fast your going in a direction
Speed and distance are scaler
Velocity and displacement are vectors
Acceleration is a change in speed or velocity
Velocity time graphs
Gradient gives acceleration of the object
Flat sections represent a constant speed
Steeper graph means a higher acceleration
Uphill sections are acceleration
Downhill sections are deceleration
A curve means changing acceleration
The area under the graph is the distance travelled
Momentum
Mass x velocity = momentum
Larger mass = larger momentum
Larger velocity = larger momentum
Momentum is conserved
Forces cause changes in momentum
Mass x change in velocity = change in momentum
Distance time graphs
Gradient gives the speed of the object
Flat sections are where the object has stopped
A curve represents acceleration
Newton’s first law
A resultant force is needed to make an object
start moving speed up or slow down
When forces are balanced an object
will move at a constant speed
A non-zero resultant force will mean
acceleration in the direction of the force
Newton’s second law
The resultant force is equal mass times acceleration
The heavier the mass the larger the resultant
Larger the force the more acceleration
Weight
Weight equals force times gravitational field strength
The stronger the gravitational field the larger the weight
Earth gravitational field strength is 10
Newton’s third law
Reaction forces are equal and opposite
If you push against something it pushes back
Objects with a smaller mass move more
Circular motion
Velocity is both speed and direction
An object moving in a circular motion has a constant speed but a changing velocity
There is a resultant force acting on it