FORCES+CHANGE+SHAPES

IGCSE PHYSICS > FORCES AND MOTION > FORCES, MOVEMENT AND SHAPE

 * ~ 1 FORCES ||~ 2 ELECTRICITY ||~ 3 WAVES ||~ 4 ENERGY ||~ 5 SLG ||~ 6 MAGNETISM ||~ 7 RADIOACTIVITY ||

Definition Types Vectors || FORCES CAUSE MOVEMENT Friction F=ma Terminal velocity || FORCES CHANGE MOMENTUM Momentum Car safety Newton's 3rd law || FORCES CAUSE TURNING Moments Centre of Gravity Beam on trestles || FORCES CHANGE SHAPES Stretching ||
 * JUST FORCES

FORCES CHANGE SHAPES
1.27 describe how extension varies with applied force for helical springs, metal wires and rubber bands

Load the spring and the elastic band and record their lengths in Excel (see table). Calculate the applied force and the extension using a formula. Plot a graph of extension against force. Use the graph to measure the mass of the mystery object.
 * INVESTIGATION: How the extension varies with the applied force for a spring and an elastic band**



CONCLUSION: HOOKE'S LAW: For certain materials, the applied force is proportional to the extension. Does either the spring or the elastic band obey Hooke's Law?

1.28 recall that the initial linear region of a force-extension graph is associated with Hooke’s law

1.29 associate elastic behaviour with the ability of a material to recover its original shape after the forces causing deformation have been removed.