Net force and changing motion — study worksheet

1. Read the core idea

Add forces with their directions in mind. Equal opposite forces can balance; an unbalanced net force changes velocity. An object moving at constant velocity can still have forces acting on it if they balance. Friction opposes relative motion or its tendency at a contact surface. Weight is gravitational force, whereas mass describes how much matter an object contains and its resistance to acceleration.

2. Trace the worked example

A cart pushed forward with 30 N against 10 N of friction has a 20 N forward net force.

Write the steps or relationships that explain the result:

3. Use the method

Draw directional arrows and compare their total effects before predicting motion.

Summarize the method in your own words, with a diagram or labeled units where useful:

4. Record a mistake to avoid

Balanced forces do not require the object to be at rest.

Describe how you will recognize and correct this mistake:

5. Review after practice

Use the mixed practice check linked in the hub. Record the skill you need to revisit and your next study step.