4 Energy, electricity and forces
|
|---|
4.2 Forces |
click4.2a Identifying, measuring and representing forces
|
| recognise simple situations where forces are balanced or unbalanced | identify situations in which opposing forces partly or entirely cancel each other out |
| use the model of arrows to describe the direction and size of forces
| explain how the quantification of the arrow model improves the description of the direction and size of forces |
| recognise that weight is the force of gravity on an object | explain the difference between mass and weight
|
| distinguish between 'contact' forces, e.g. pushes, pulls and friction, and 'remote' forces, e.g. gravity, magnetic attraction and repulsion | describe the shape and direction of a magnetic field around a bar magnet using an arrow model |
click4.2b Forces and motion
|
| describe simply the changes in movement or shape of an object in terms of the forces acting on it | explain the behaviour of moving and stationary objects in terms of two or more forces acting on them |
| recognise that gravity is a force that has size and direction and acts on all objects
| describe qualitatively how weight would differ in other parts of the solar system
|
| recognise where forces are balanced or unbalanced and use the arrow model to show direction of motion
| use qualitative models to describe motion in terms of speed, distance and time |
click4.2c Forces and turning effects
|
| use ideas of the turning effect of forces to predict whether objects will turn and their direction of rotation
| describe changes in movement using an arrow model to indicate the size of the applied force and where it is applied in relation to the pivot |
click4.2d Forces and pressure
|
| explore the relationship between force, area and pressure
| use the relationship between pressure, force and area as a qualitative model to explain familiar observations, e.g. the use of caterpillar tracks or snow shoes
|
| recognise the differences between the everyday and scientific way of talking about pressure
| explain familiar observations, e.g. drinking through a straw, in terms of the effects of unequal pressure |
