- Two dynamic trolleys
- Electronic balance
- Meter ruler
- Several 1KG masses to add to the trolleys
- 2 x Rubber bands
- Level bench top
- Piece of A4 paper
- Masking tape
1) Attach the piece of A4 paper to the bench top with masking tape. Rule two parallel lines on the paper, 20 cm apart.
2) Link the two trolleys with the rubber bands.
3) Pull the trolleys apart and hold them with their front ends on the two lines.
4) Release the trolleys. The trolleys will accelerate towards each other and collide at the same time. How far the trolleys travel travel in a given time is proportional to their relative velocities.
Determine where the trolleys collide and mark the collision point on the paper.5) Measure the distance from one line to the collision point, and the same for the other one. Because the trollies collide at the same time, there is no need to measure the time because distances are proportional to the collisions.
6) Add various masses to one (or both) of the trollies and repeat the experiment. Test five different weight combinations
After the collision, both trollies remained at rest leaving the final momentum at zero, as they were not moving. The initial momentum, however, was measured at 0.02kg m/s due to the differences in weight.