Weight and Circular Motion
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What is weight?
Weight is the force acting downwards on an object due to gravity
What can be used to measure weight?
• A calibrated spring balance • A newton meter
What is the equation to calculate weight?
(Exam-style question) Describe the mass and weight of an astronaut on the moon, compared to their mass and weight on Earth.
• Mass remains the same • Weight decreases because gravitational force is lower on the moon
What happens to an object that travels in a circle at a constant speed?
• The object constantly changes direction, therefore it changes velocity • This means the object accelerates
What is the force that keeps an object moving in a circular path called?
Centripetal force
In what direction does the force that keeps an object moving in a circle act?
Towards the centre of the circle