use the following units: newton per kilogram (N/kg), newton metre (Nm), kilogram metre/second (kg m/s).
use the relationship between final speed, initial speed, acceleration and distance moved:
(final speed)2 = (initial speed)2 + (2 x acceleration x distance moved)
describe the effects of forces between bodies such as changes in speed, shape or direction
identify different types of force such as gravitational or electrostatic
understand how vector quantities differ from scalar quantities
understand that force is a vector quantity
calculate the resultant force of forces that act along a line
know that friction is a force that opposes motion
know and use the relationship between unbalanced force, mass and acceleration:
force = mass × acceleration
know and use the relationship between weight, mass and gravitational field strength:
weight = mass × gravitational field strength
know that the stopping distance of a vehicle is made up of the sum of the thinking distance and the braking distance
describe the factors affecting vehicle stopping distance including speed, mass, road condition and reaction time
describe the forces acting on falling objects and explain why falling objects reach a terminal velocity
know and use the relationship between the moment of a force and its distance from the pivot:
moment = force × perpendicular distance from the pivot
know that the weight of a body acts through its centre of gravity
use the principle of moments for a simple system of parallel forces acting in one plane
understand how the upward forces on a light beam, supported at its ends, vary with the position of a heavy object placed on the beam
practical: investigate how extension varies with applied force for helical springs, metal wires and rubber bands
know that the initial linear region of a force-extension graph is associated with Hooke’s law
describe elastic behaviour as the ability of a material to recover its original shape after the forces causing deformation have been removed.
