Contact And Non-contact Forces (GCSE Physics)

Which of these best describes the electric force between two small charged spheres if the distance between them is doubled?

A charged rod repels another rod at a distance. Which property of the rods causes the strength of that non-contact force to change if you move them further apart?

A suspended mass is attached to a spring and is pulled down then released so it oscillates. Which two forces are mainly involved during the vertical motion?

A metal ball hangs on an insulating thread near a charged rod; it is attracted but does not touch. If you now earth the ball, what happens and why?

A metal dome on a Van de Graaff style generator becomes negatively charged. A person touches the dome and their hair stands on end. Why does the hair stand up?

A charged rod is brought near, but does not touch, an uncharged metal sphere that is earthed. Electrons flow to ground so the near side becomes positively charged and attraction occurs. This process is called:

Which of the following pairs are both examples of contact forces?

Which of these is a correct pairing: force and whether contact or non-contact?

Two magnets are held near each other so their like poles face. What non-contact force acts between them and what is its direction?

Which of these is an example of a non-contact force?

A student measures the weight (force due to gravity) of an object using a spring balance on Earth and then on the Moon. Which will change and why?