Edexcel IGCSE Physics 1.28P Force & momentum change
Practise applying force, time and momentum change to impacts, turbines, engines and collisions, including directions and unit conversions.
- Syllabus
- First assessment 2019
- Course
- Physics 4PH1
Exam points
- calculate mean force from F = change in momentum / time using contact time in seconds
- find time or change in velocity by rearranging the force and momentum equation
- state the force direction from the direction of the momentum change
1.28P Force and momentum change question 1
The diagram shows a child's toy for accelerating steel balls.
This is how the toy works.
- the toy uses three identical steel balls, each with a mass of 4.1 g
- ball A moves towards the magnet
- ball B is in contact with the magnet
- balls B and C are initially at rest and are in contact with each other
- when ball A collides with the magnet, ball C moves away from the magnet
When ball A collides with the magnet, a force of 1.3 N is exerted on ball C for a time of 0.0025 s.
This causes ball C to move away from the magnet.
Calculate the change in velocity of ball C due to this force.
change in velocity = ............ m/s
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