Physics – NCEA 2.4 Mechanics – videos and notes to pass the exam
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- Click here to download the notes for the Energy and Momentum questions.
- Click here for sample test questions and solutions.
| Energy and Momentum Questions | Click on the hyperlinks to watch the video |
|---|---|
| Question 1a | Leon is rolling 2 balls for fun. Ball A was rolled first . Ball B was then rolled in the same direction. Ball B has a mass of 3 kg. Ball A has a mass of 9 kg. Ball A and B are rolling at speed 7 m/s and 4.5 m/s respectively. What is the total momentum of both balls? |
| Question 1b | Ball A then collided into Ball B in such a way that momentum is conserved from the collision. Both balls are still rolling in the same direction. The momentum of Ball A after collision is 36 kgm/s What is the change in momentum of Ball A? |
| Question 1c | The balls were in contact for 0.7s collision? What is the average force during |
| Question 2 | Leon jumps on the trampoline. The mat was stretched downward by 0.4 m The spring constant is 3740 N/m. Leon weighs 57 kg What is the vertical height to which Leon will rise above his lowest position? |
| Question 3 | Leon joins a rowing race with friends. The speed was increased to 3.6 m/s from rest. With the acceleration of 0.8 m/s², Leon has a mass of 53 kg. What is the minimum average power Leon must produce to cause this acceleration? |
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