Forces and pivots
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Science KS3 Lesson 2: Forces and pivots
Screen 2.1: When a force acts at a distance from a pivot, it causes a turning moment.
2.1b: Correct answer
Screen 2.2: Tower cranes use a counterweight to provide a balancing force for the load. Look at the formula for measuring a turning moment and calculate the correct answer.
2.2b: Correct answer
Screen 2.3: Which load can be safely carried furthest from the tower (or centre) of the crane?
2.3b: Correct answer
Screen 3: Use the diagram to discuss some factors that influence how cranes are positioned to work safely.