![]() ![]() The speed at which a person can walk, run or cycle depends on many factors including: age, terrain, fitness and distance travelled.When people walk, run or travel in a car their speed is constantly changing. The speed of a moving object is rarely constant.Students should be able to express a displacement in terms of both the magnitude and direction.Displacement includes both the distance an object moves, measured in a straight line from the start point to the finish point and the direction of that straight line.Work done against the frictional forces acting on an object causes a rise in the temperature of the object.Students should be able to convert between newton-metres and joules.Students should be able to describe the energy transfer involved when work is done.One joule of work is done when a force of one newton causes a displacement of one metre.Work done = force × distance moved along the line of action of the force The work done by a force on an object can be calculated using the equation:.So a force does work on an object when the force causes a displacement of the object. When a force causes an object to move through a distance work is done on the object.Students should be able to use vector diagrams to illustrate resolution of forces, equilibrium situations and determine the resultant of two forces, to include both magnitude and direction (scale drawings only).The two component forces together have the same effect as the single force. A single force can be resolved into two components acting at right angles to each other.use free body diagrams to describe qualitatively examples where several forces lead to a resultant force on an object, including balanced forces when the resultant force is zero. describe examples of the forces acting on an isolated object or system Students should be able to calculate the resultant of two forces that act in a straight line. ![]() This single force is called the resultant force. ![]()
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