Year 9 Science · Unit 4 · Lesson 16

Forces and Newton's Laws

Foundation Worksheet

Name
Date
Class

Learning Goals

Warm Up

Sort it!

Write each force from the pool into the correct category box below.

Friction between tyres and road Gravity pulling apple down Tension in a rope Magnetic attraction Normal force from floor Electrostatic force Applied push on a door Air resistance Gravitational pull of Moon on ocean Friction in a bearing

Contact forces

Non-contact forces

Your Turn

Fill the gap

Choose the correct word from the word bank to complete each sentence about forces and Newton's First and Second Laws.

force Newton friction net force inertia acceleration balanced velocity mass

A is a push or pull measured in the unit called a (N). When you push a shopping trolley, the between the wheels and the floor opposes your push. The is the sum of all forces acting on an object. Newton's First Law says that an object's tendency to resist changes in motion is called . When all forces are , the net force is zero and the object maintains constant . According to Newton's Second Law, the greater the , the greater the for the same mass.

Show What You Know

1. A passenger in a car is not wearing a seatbelt. The car brakes suddenly. Using Newton's First Law, explain what happens to the passenger and why.

Recall 2 marks

2. A force of 30 N acts on a 6 kg trolley. Calculate the acceleration of the trolley. Show your working using F = ma.

Recall 2 marks

Wrap Up

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

HSCScience · Year 9 Science · Unit 4 · Lesson 16 · Foundation Worksheet