Year 9 Science · Unit 4 · Lesson 15

Checkpoint 3 — Motion Graphs Review

Foundation Worksheet

Name
Date
Class

Learning Goals

Warm Up

Fill the gap — motion concepts summary

Choose the correct word from the word bank to complete each sentence. Each word is used once. Two words are distractors that are not needed.

scalar vector displacement velocity gradient acceleration deceleration friction momentum

Speed is a quantity because it has magnitude only, while is a vector quantity because it has both magnitude and direction. The straight-line distance from start to finish is called , whereas distance is the total path length travelled. On a distance-time graph, the of the line equals the object's speed. On a speed-time graph, the gradient equals the object's . When an object slows down, we say it undergoes , which appears as a falling line on a speed-time graph. A force with both magnitude and direction is a quantity.

Your Turn

Sort it! — motion facts into three categories

Write each item from the pool into the correct category box below. Each item belongs to exactly one category.

Gradient = speed Horizontal line = stationary Speed has no direction Gradient = acceleration Area under line = distance Velocity has direction Downward slope = returning Horizontal line = constant speed Displacement is a vector Falling line = deceleration Distance is a scalar Steeper slope = faster speed

Scalars & Vectors

Distance-Time Graphs

Speed-Time Graphs & Acceleration

Show What You Know

1. A car travels at 80 km/h north on the Pacific Highway for 2 hours. Write down its: (a) speed, (b) velocity, (c) distance travelled.

Recall 3 marks

2. Explain the difference between what a horizontal flat line means on a distance-time graph versus a speed-time graph.

Recall 2 marks

Wrap Up

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

HSCScience · Year 9 Science · Unit 4 · Lesson 15 · Foundation Worksheet