Momentum and its conservation
Watch the whole lecture free
Make a free account to watch every lecture to the end: 2 worked examples, 8 practice questions, 1 real past-paper question with the answer explained, the mistakes that lose marks, the full-marks tip, a one-card summary and a quick quiz.
That was the teaching part. The rest of this lecture is free with an account: 2 worked examples, 8 practice questions, 1 real past-paper question with the answer explained, the mistakes that lose marks, the full-marks tip, a one-card summary and a quick quiz.
No password needed now: we email you a link to set one. Already have an account? Sign in, then come back to this page.
The teaching part (1 min) is free to watch. A free account opens the whole lecture: 2 worked examples, 8 practice questions, 1 real past-paper question with the answer explained, the mistakes that lose marks, the full-marks tip, a one-card summary and a quick quiz.
What this lecture covers
- Why is a lorry harder to stop?
- Momentum
Read the transcript of the teaching part
Last time
Before we start: last time, in Thinking, braking and stopping distance, you learned these points. Here they are again on one card. Keep them in mind, because today builds on them.
Why is a lorry harder to stop?
A cyclist and a lorry both travel at ten metres per second. Both are moving at the same speed, but stopping the lorry is far harder. The lorry has more momentum: more mass in motion.
Momentum
Momentum is the product of an object's mass and its velocity. The symbol is p, so p equals m v. The unit is kilogram metres per second. Momentum is a vector: it points in the direction of the velocity.
How often it comes up
How often Cambridge has asked each part, counted by ExamYard from every past paper in its question bank: Collisions and conservation of momentum · Momentum and impulse.
Chapter 1.6: Momentum
- Momentum and its conservation 6 min
Also for O Level Physics 5054
Which topics come up most in O Level Physics 5054 past papers, counted from every paper since 2004.