Contact And Non-contact Forces (GCSE Physics)

A textbook rests on a table. Which force pairs act on the textbook and are equal in magnitude when it is at rest?

A teacher uses a Van de Graaff generator so a pupil’s hair stands up. The teacher then brings a grounded metal object close and a spark jumps. Which two reasons explain why the spark occurs?

A small permanent magnet is brought near a piece of iron and the iron becomes temporarily magnetised. What type of magnet is the iron while it is magnetised?

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

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 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?

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 statement correctly describes what a step-down transformer does at the consumer end of the National Grid?

A car parked on a slope has a tendency to slide down. Which two forces must be present for the car to be in static equilibrium on the slope?

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?