Laws of Motion Exe-3A Contact and Non-contact Forces Short and Long Answer Type for Class-9 ICSE Concise Physics. There is the solutions of Short and Long Answer type Questions of your latest textbook which is applicable in 2023-24 academic session. Visit official Website CISCE for detail information about ICSE Board Class-9.
Laws of Motion Exe-3A Contact and Non-contact Forces Short Answer
(ICSE Class – 9 Physics Concise Selina Publishers)
| Board | ICSE |
| Class | 9 |
| Subject | Physics |
| Writer / Publication | Concise selina Publishers |
| Chapter-3 | Laws of Motion |
| Exe – 3A | Contact and Non-contact Forces |
| Topics | Solution of Exe-3(A) Short and Long Answer Type |
| Academic Session | 2023-2024 |
Exe-3A Contact and Non-contact Forces Short Answer Type
Ch-3 Laws of Motion Physics Class-9 ICSE Concise
Page 65
Question 1. Explain giving two examples each of :
(a) Contact forces
(b) Non – contact forces
Answer :
(a) The forces which act on bodies when they are in physical contact are called contact forces.
Example: frictional force and force exerted on two bodies during collision.
(b) The forces experienced by bodies even without being physically touched are called non-contact forces.
Example: Gravitational force and Electrostatic force.
Question 2. State the effects of a force applied on
(i) A non-rigid, and
(ii) A rigid body.
How does the effect of the force differ in the two cases?
Answer :
A force when applied on a non-rigid body changes the inter-spacing between its constituent particles and therefore causes a change in its dimensions and can also produce motion in it.
On the other hand, a force when applied on a rigid body, does not change the inter-spacing between its constituent particles and therefore it does not change the dimensions of the body but causes motion in it.
Question 3. What is the frictional force ? Draw a neat labelled diagram showing a frictional force acting on a body.
Answer :
Frictional force is the force generated by two surfaces that contact and slide against each other.
Question 4. What is a normal reaction force ? Draw a neat labelled diagram showing a normal reaction force acting on a body.
Answer : The normal force is a force that is felt every day. For example, when we place a book on a table, the typical reaction force resists the book from falling through the table, the strength of gravity is drawing the book downward, but the book isn’t falling.
Exe-3A Contact and Non-contact Forces Long Answer Type
Laws of Motion Exe-3A Short Answer Class-9 ICSE
Page 65
Question 1.
(a) A ball is hanging by 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 and labeled diagram showing the forces acting on the spring.
(c) A wooden block is placed on a table top. 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)
(c)
The forces acting on the block are its weight in the downward direction and the normal reaction force due to the table on the upward direction.
— : End of Laws of Motion Exe-3A Contact and Non-contact Forces Short and Long Answer Type Solutions :–
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