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Course: Class 9 Physics (India)>Unit 2

Lesson 4: Momentum and force

Calculating momentum changes - Solved example

Let's calculate changes in momentum & force in a couple of scenarios. Created by Mahesh Shenoy.

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• one silly question
if there is given that we need to calculate rate of change of momentum or change in momentum, we always use formula "mv - mu " right ? we never use formula of force that is "m * a"?
• because in this question acceleration is not given so, by deriving it more further we get mv - mu
(1 vote)
• sometimes the clay slides down the wall what happens in that case I mean how can we calculate that speed
• you can calculate the speed of the clay after impact using conservation of momentum. If you want to determine its speed as it slides down the wall, you'll also need to consider gravitational forces and possibly friction.
(1 vote)
• the wall is at rest, but how does it have force acting against it which made the clay stop?