Contact And Non-contact Forces (GCSE Physics)

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 small compass deflects when placed near a current-carrying straight conductor. Which non-contact effect causes the compass needle to move?

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

A small object of mass m is held at rest in air by a string. Which diagram of forces correctly lists the two vertical forces acting on the object and their directions?

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 point force that acts where two objects touch (for example friction or normal reaction) is called a contact force. Which of the following is a contact force?

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 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 these is an example of a non-contact force?

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