Materials

• magnet launcher
• 4 magnets
• meter stick

The projectile launcher is a springboard that transfers energy to an object to make it shoot upwards.

1. Explore the launcher.

Practice launching one of the magnets so that it goes to the same height each time. Pull the spring board down to the same point (the table top) each time, and release it the same way so the magnet moves consistently.

Record two observations.

2. How does the height that the projectile reaches depend on its weight?

To investigate this, launch a stack of two magnets, three magnets, or four magnets, measuring the height each combination reaches. Repeat the measurement 5 times for each combination.

Record your data in Table 1, in meters.

Table 1: Height different projectiles reach when launched with the same launcher

3. Record the median height achieved by each projectile in table 2 below

4. The energy needed to raise an object straight up is calculated by E = W x H. (in Joules, if the height is in meters). In the last column, calculate the energy transferred to each projectile.

Table 2: Calculating the energy transferred to each projectile

5. Compare the energy transferred to each projectile

6. Why does the stack of 4 magnets not go as high as the other combinations?

7. What role did the law of conservation of energy play in this activity?

Science content: kinetic energy and potential energy