1. Graphs for constant velocity Velocities add up as Resultant force is the result of adding up all the
vectors forces. Eg 10N to the left and 8N to the right is
3 + 4 = 5 m/s the same as 2N to the left.
Speed= distance Gradient (slope) = speed A projectile takes the Weight = mass x gravitational field strength
Time same time to fall as an
object dropped vertically
If the resultant is zero then all the forces
Accel= change in vel – it follows a parabolic
balance, so the object will either stay at rest
time path.
or continue at constant velocity eg terminal
Can use equation
velocity for a sky diver.
Gradient = acceleration S = ut + 1/2 at2
Area = distance travelled
forces If there is a resultant force
then the object will accelerate
Speed, velocity and
Thinking distance = speed x given by:
reaction time acceleration force = mass x acceleration
Stopping distance = thinking
distance + braking distance. Motion Momentum = mass x velocity
Measured in kgm/s, is a vector
Work done = energy Force = change in momentum
transferred. momentum Time taken
Work, energy and
So, to get a bigger change in mom,
Work = force x power
we follow through = more time.
distance.
Also, to get a smaller force, we
make time large eg crumble zone
Kinetic energy =
Power = work done
1/2 mass x Time Momentum is always
Gravitational potential
(velocity squared) energy = mass x g x h Measured in watts, W conserved in collisions
Mom before = Mom after
and explosions, 0 = 0