Curriculum Links
Describing motion
– speed and the quantitative relationship between average speed, distance and time (speed = distance ÷ time)
– the representation of a journey on a distance-time graph
Forces
– forces as pushes or pulls, arising from the interaction between 2 objects
– using force arrows in diagrams, adding forces in 1 dimension, balanced and unbalanced forces
– forces: associated with deforming objects; stretching and squashing – springs; with rubbing and friction between surfaces, with pushing things out of the way; resistance to motion of air and water
– forces measured in newtons, measurements of stretch or compression as force is changed
– force-extension linear relation; Hooke’s Law as a special case
Pressure in fluids
– pressure in liquids, increasing with depth; upthrust effects, floating and sinking
– pressure measured by ratio of force over area – acting normal to any surface
Balanced forces
– opposing forces and equilibrium: weight held by stretched spring or supported on a compressed surface
Forces and motion
– forces being needed to cause objects to stop or start moving, or to change their speed or direction of motion (qualitative only)
– change depending on direction of force and its size
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