Year 7 Science · Unit 3 · Lesson 4

Net Force and Balanced Forces

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Date
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Learning Goals

Warm Up

Compare two

Complete the table to compare balanced forces and unbalanced forces.

FeatureBalanced forcesUnbalanced forces
Net force value
Effect on a stationary object
Effect on a moving object
Real-world example
Free-body diagram look

Your Turn

Because… chain

Fill in the missing effects. A driver applies the brakes on a moving car. Trace what happens step by step.

Driver presses the brakes
→
Friction force acts backward on the car
→
Net force is no longer zero
→
The car decelerates (slows down)
→

Overall outcome:

Show What You Know

1. A plane is flying at constant speed and constant height. Describe what you know about the horizontal forces (thrust vs drag) AND the vertical forces (lift vs weight). Use the term "balanced" in your answer.

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2. Two students push a heavy box across a floor. One pushes forward with 80 N, the other pushes backward with 50 N. Calculate the net force and predict what happens to the box. Show your working.

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Wrap Up

In one sentence, what was the main idea of this lesson?

HSCScience · Year 7 Science · Unit 3 · Lesson 4 · Apply Worksheet