OCR GCSE Combined Science
A 5000 kg cannon fires a 10 kg cannonball.
Just after firing, the momentum of the cannonball is 50 kg m / s.
What is the velocity of the cannon just after firing?
Use the equation: momentum = mass × velocity
A –0.2 m / s
B –0.01 m / s
C 0.01 m / s
D 0.2 m / s
Four cars are travelling along a road.
Which car has the highest momentum?
Use the equation: momentum = mass × velocity
| Mass of car (kg) | Velocity of car (m / s) | |
| A | 1000 | 5 |
| B | 1000 | 10 |
| C | 2000 | 5 |
| D | 2000 | 10 |
A child is holding a marble at a height of 0.8 m.
The mass of the marble is 0.015 kg.
Calculate the gravitational potential energy of the marble.
Gravitational field strength = 10 N / kg.
Use the equation: gravitational potential energy = mass × gravitational field strength × height
The child rolls the marble along a track. The diagram shows the marble and track.
The kinetic energy of the marble at the bottom of the track is less than the potential energy of the marble calculated at the top of the track.
Suggest and explain why.
The mass of the marble is 0.015 kg.
The kinetic energy of the marble at the bottom of the track is 0.03 J.
Calculate the speed of the marble at the bottom of the track. Use the equation: kinetic energy = 
× mass × (speed)2
Speed of marble =........ m / s
The child now has a small marble and a large marble. The child rolls the small marble across the floor. The small marble collides with the stationary large marble.
The diagram shows the marbles before and after the collision.
Before the collision
After the collision
The mass of the small marble is 5 grams. The mass of the large marble is 20 grams.
Use the information in the diagram to calculate the speed of the large marble after the collision.
Use the Equation Sheet.
Speed of large marble =........ m / s
A teacher teaches their class about momentum.
Define the term momentum.
Define the principle of conservation of momentum.
The teacher repeats the experiment with a different pellet as shown in Fig. 16.2.
Fig. 16.2
• The pellet becomes stuck in the apple and they move off the wall together.
• The mass of the pellet is 0.011 kg.
• The mass of the apple is 0.089 kg.
Calculate the velocity of the pellet and apple after the collision. Use the Data Sheet.
Velocity of pellet and apple =........ m / s
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Combined Science starter pack