Cambridge IGCSE Physics1.5 Forces Checklist

Give me a quiz on this topic
Download checklist

Download more IGCSE materials here

What's on this checklist

Core

  • I know that forces can change the size and shape of an object.
  • I can sketch, plot and interpret load–extension graphs for an elastic solid, and describe the experiments used to obtain them.
  • I can find the resultant of two or more forces that act along the same straight line.
  • I know that an object stays at rest, or keeps moving in a straight line at constant speed, unless a resultant force acts on it.
  • I can state that a resultant force may change the velocity of an object, by changing its speed or its direction of motion.
  • I can describe solid friction as the force between two surfaces that can impede motion and produce heating.
  • I know that friction (drag) acts on an object moving through a liquid.
  • I know that friction (drag) acts on an object moving through a gas, for example air resistance.
  • I can describe the moment of a force as a measure of its turning effect, and give everyday examples.
  • I can define the moment of a force as moment = force × perpendicular distance from the pivot, and I can recall and use this equation.
  • I can apply the principle of moments when there is one force on each side of the pivot, including balancing a beam.
  • I can state that an object is in equilibrium when there is no resultant force and no resultant moment acting on it.
  • I can state what is meant by the centre of gravity.
  • I can describe an experiment to find the position of the centre of gravity of an irregularly shaped plane lamina.
  • I can describe, qualitatively, how the position of the centre of gravity affects the stability of simple objects.

Extended

  • I can define the spring constant as force per unit extension, and I can recall and use the equation k = F/x.
  • I can define and use the term 'limit of proportionality' for a load–extension graph, and identify this point on the graph (the elastic limit is not needed).
  • I can recall and use the equation F = ma, and I know that the force and the acceleration act in the same direction.
  • I can describe, qualitatively, motion in a circular path caused by a force perpendicular to the motion:a)if the force increases while mass and radius stay constant, the speed increasesb)if the force increases while mass and speed stay constant, the radius decreasesc)a greater mass needs a greater force to keep the speed and radius constant
  • I can apply the principle of moments to other situations, including those with more than one force on each side of the pivot.
  • I can describe an experiment to show that there is no resultant moment on an object in equilibrium.