The earth pulls all bodies towards it. The weight of a body is not a constant quantity, but depends upon the mass and acceleration due to gravity acting on the body. The SI unit of weight is newton . Weight of a body is defined as the force exerted on a body by gravity. Like all forces, weight also has a direction, and it points vertically downward. Weight is measured using a spring balance. Weight of the body is given, W = m g where m is the mass of the object and g is the acceleration due to gravity.

Physics for Cambridge IGCSE workbook>Chapter 3 - Forces and Motion>Exercise 3.3>Q 4

EASY

Upper Secondary-IGCSE

IMPORTANT

Earn 100

Draw a diagram showing a body with four forces acting on it. Their resultant must be $4 N$ acting vertically downwards.

Important Questions on Forces and Motion

EASY

Upper Secondary-IGCSE

IMPORTANT

Physics for Cambridge IGCSE workbook>Chapter 3 - Forces and Motion>Exercise 3.4>Q 1

Define weight.

EASY

Upper Secondary-IGCSE

IMPORTANT

Physics for Cambridge IGCSE workbook>Chapter 3 - Forces and Motion>Exercise 3.4>Q 1

State the equation that connects mass and weight.

EASY

Upper Secondary-IGCSE

IMPORTANT

Physics for Cambridge IGCSE workbook>Chapter 3 - Forces and Motion>Exercise 3.4>Q 1

State the name of the instrument we use in the laboratory to measure weight.

EASY

Upper Secondary-IGCSE

IMPORTANT

Physics for Cambridge IGCSE workbook>Chapter 3 - Forces and Motion>Exercise 3.4>Q 2

State the accepted value of the gravitational field strength on Earth.

EASY

Upper Secondary-IGCSE

IMPORTANT

Physics for Cambridge IGCSE workbook>Chapter 3 - Forces and Motion>Exercise 3.4>Q 3

It is often said that astronauts are weightless in the International Space Station, which orbits just outside the atmosphere. State whether you think is true. Explain your answer.

EASY

Upper Secondary-IGCSE

IMPORTANT

Physics for Cambridge IGCSE workbook>Chapter 3 - Forces and Motion>Exercise 3.4>Q 4

When a man is indoor skydiving, he will be floating, stationary. Imagine the same man to be floating in deep space. Compare the forces required for him to move horizontally in a building on Earth and in deep space. Ignore any differences due to the suit. Explain your answer.

EASY

Upper Secondary-IGCSE

IMPORTANT

Physics for Cambridge IGCSE workbook>Chapter 3 - Forces and Motion>Exercise 3.4>Q 5

Imagine a creature that lives on Jupiter came to Earth and competed in the Olympic high jump. Consider how likely they are to perform against human competitors and explain your answer. (