Conservation of momentum
I can use the principle of conservation of momentum to calculate motions after a collision or explosion.
Conservation of momentum
I can use the principle of conservation of momentum to calculate motions after a collision or explosion.
These resources will be removed by end of Summer Term 2025.
Lesson details
Key learning points
- Momentum = mass × velocity, p = mv
- In a closed system, the total momentum before an event equals the total momentum after the event.
Keywords
Momentum - is the product of the mass and velocity of an object, p = m × v
Kilogram metres per second - is the unit of momentum (kg m/s)
Conservation of momentum - is the principle that states, for a closed system, momentum is always conserved in any interaction
Collisions - happen when two objects move together and hit each other
Explosions - happen when a single object splits, or combined objects separate, into pieces that move apart
Common misconception
Pupils may assume that being able to complete calculations by substituting numbers into an equation is the same as fully understanding the relationship.
Include questions for which pupils are required to explain their understanding.
To help you plan your year 11 physics lesson on: Conservation of momentum, download all teaching resources for free and adapt to suit your pupils' needs...
To help you plan your year 11 physics lesson on: Conservation of momentum, download all teaching resources for free and adapt to suit your pupils' needs.
The starter quiz will activate and check your pupils' prior knowledge, with versions available both with and without answers in PDF format.
We use learning cycles to break down learning into key concepts or ideas linked to the learning outcome. Each learning cycle features explanations with checks for understanding and practice tasks with feedback. All of this is found in our slide decks, ready for you to download and edit. The practice tasks are also available as printable worksheets and some lessons have additional materials with extra material you might need for teaching the lesson.
The assessment exit quiz will test your pupils' understanding of the key learning points.
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Explore more key stage 4 physics lessons from the Forces make things change unit, dive into the full secondary physics curriculum, or learn more about lesson planning.
Licence
Starter quiz
6 Questions
Exit quiz
6 Questions
momentum -
the product of the mass and velocity of an object, $$p = m × v$$
kilogram metres per second (kg m/s) -
the unit of momentum
conservation of momentum -
for a closed system, momentum is always conserved in any interaction
collisions -
happen when two objects move together and hit each other
explosions -
happen when a single object splits into pieces that move apart