Contact And Non-contact Forces (GCSE Physics)

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?

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

A paper clip is attracted to a magnet without touching it. This is an example of which of the following?

In the National Grid a transformer near the power station “steps up” the voltage for long-distance transmission. What is the main electrical reason step-up transformers are used?

Which of the following is NOT a non-contact force?

A charged balloon sticks to a neutral wall after being rubbed on hair. Which statement best explains why the balloon sticks?

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

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 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:

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?

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?