Momentum is movement in a particular direction. The concept of momentum can be easily explained to children, using marbles. This experiment is pure fun: the kids get to play with marbles. Yet they also learn a lot about movement and how it originates.
Science Experiment on Momentum
Place four same-size marbles in a line on the floor. Now roll a fifth marble towards them.
You can see that the moving marble stopped moving and the last marble in the row started moving. It happened because the momentum from the first marble got transferred to the second marble, and then to the third and so on.
Now, roll two marbles towards the two stationary marbles.
The last two marbles begin to move away, as the momentum from the first moving marble transfers to the last marble in the row, and the momentum from the second moving marble transfers to the second to last marble in the row.