Forces, Interactions and Energy Resources
How forces act between objects, and what influences the energy resources we use.
8 questions, free, marked as you go with a worked explanation on every one.
What this covers
- balanced and unbalanced forces
The questions
- Two forces act on a box in opposite directions, 10 N left and 10 N right. What happens?
- A 12 N force pushes right and a 5 N force pushes left on the same object. What is the net force, in newtons?
- Why is it easier to slide a heavy box on a smooth floor than a rough one?
- Which factors influence which energy resources a community uses? Select all that apply.
- What is a disadvantage of fossil fuels compared with renewable sources?
- A skydiver falls at a constant speed with the parachute open. What does this tell you?
- A steel cable holds a heavy sign hanging from a building, and a steel post beneath a balcony holds the balcony up from below. Which internal force is at work in each part?
- The spring inside a kitchen scale is 12 cm long with an empty pan. Each 100 g mass placed in the pan stretches it a further 2 cm. How long is the spring when three 100 g masses sit in the pan, in centimetres?