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Selina Solutions Class 9 Physics Solutions for Exercise 3A in Chapter 3 - Chapter 3 Laws Of Motion

Question 4 Exercise 3A

(a) A ball is hanging by a string from the ceiling of the roof. Draw a neat labelled diagram showing the forces acting on the ball and the string.

(b) A spring is compressed against a rigid wall. Draw a neat labelled diagram showing the forces acting on the spring.

(c) A wooden block is placed on a tabletop. Name the forces acting on the block and draw a neat and labelled diagram to show the point of application and direction of these forces.

Answer:

(a) The diagram shows the forces acting on the ball and the string

Selina Solutions CONCISE Physics - Class 9 ICSE chapter Chapter 3 Laws Of Motion Question 4 Solution image

(b) The diagram shows the forces acting on the spring

Selina Solutions CONCISE Physics - Class 9 ICSE chapter Chapter 3 Laws Of Motion Question 4 Solution image

(c) The diagram shows the point of application and the direction of these forces

Selina Solutions CONCISE Physics - Class 9 ICSE chapter Chapter 3 Laws Of Motion Question 4 Solution image

The following are the forces that act on the block

· Reaction force from the table in the upward direction

· Weight of the block in the downward direction

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