Newton’s second law

The title of the Project: Newton’s second law

Purpose of the work:

  • Prove Newton’s second law.

Practical part

Choose “Acceleration” to start the virtual experiment.

This is a little instruction to the virtual experiment.

Part 1. Net force

Virtual experiment.

Step 1. Apply some force to the body such that it moves. Notice that the net force is not zero. How does the acceleration change?

Step 2. Increase the applied force in small increments. Notice that the net force on the body increases. How does the acceleration change? 

Step 3. Increase the friction coefficient, such that the sliding friction force is greater than the applied force, but the net force is not zero. What happens? How does the acceleration change?

Step 4. Notice that the net force changed the direction, and the acceleration became negative.  Acceleration and net force are vector quantities, therefore the change in direction changes these quantities.

Step 5. Wait until the body stops. The net force is zero again. Decrease the friction coefficient. What happens? The net force increases and becomes positive again and so does the acceleration.

Step 6. Make a conclusion.

Part 2. Mass

Virtual experiment.

Step 1. Restart the experiment. Apply some force to the body such that it moves. Notice that the net force is positive and the acceleration as well.

Step 2. Add another box. Decrease the friction coefficient such that the net force doesn’t change. How does the acceleration change? 

Step 3. Make a conclusion.

Conclusion

Acceleration is directly proportional to the net force that acts on the body and inversely proportional to the mass of the body as Newton’s second law states.