PHYSICS 9TH
PHYSICS 9TH - Short / Detailed Question Answers
THERMAL PROPERTIES OF MATTER
CHAPTER # 09
Q.1: Define heat. What is its unit?
Ans:
Heat:
Heat is a form of energy that transfers from a hot body to a cold body as a result of the difference in temperature between them.
Unit of Heat:
As heat is a form of energy, its S.I unit is joule. Its other unit is a calorie.
PHYSICS 9TH
PHYSICS 9TH - Short / Detailed Question Answers
ENERGY SOURCES AND TRANSFER OF ENERGY
CHAPTER # 08
Q.1: Define force.
Ans:
Force is an agent which tends to change the state of an object.
Q.1: Define matter.
Ans: Anything which occupies space and having mass is called matter.
Q.2: How many states of matter are there?
Ans: There are three states of matter. These states are solid, liquid, and gas. All the material objects around us belong to any one of these states.
PHYSICS 9TH – Short / Detailed Question Answers
GRAVITATION
CHAPTER # 06
Q.1: State Newton’s Law of Gravitation. Derive the equation, .
Ans:
Newton’s Law of Gravitation:
Newton’s Law of universal gravitation states that: Every body in the universe attracts every other body with a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centres.
PHYSICS 9TH - Short / Detailed Question Answers Chapter #05: FORCES AND MATTER
Q.1: What can a force do? Give some examples.
Ans:
PHYSICS 9TH - Short / Detailed Question Answers
Q.1: Define force.
Ans: Force: Force is a push or pull which moves the objects. It can stop the objects. It also gives shape to the objects. It is a vector quantity. Therefore, it has a specific direction. It is measured in Newton (N).
Q.2: Define Parallel forces.
Ans: The parallel forces can be defined as, “when a number of forces act on a body and if their directions are parallel, they are called parallel forces.”
PHYSICS 9TH – Short / Detailed Question Answers
DYNAMICS
CHAPTER # 03
Q.1: Describe force and its unit.
Ans: Force:
Force is the agent that changes the state of rest or uniform motion of a body. Its S.I unit is Newton (N). One Newton (1N) is the amount of force that can produce acceleration in mass. An object at rest needs a force to get moving; a moving object needs a force to come to rest or change its direction. The magnitude of a force can be measured using a spring balance.
In short, force is required to change the position, state, or shape of an object. It can act as a pull or push agent. Force produces acceleration and can produce distortion. It is a vector quantity.
PHYSICS 9TH – Short / Detailed Question Answers
KINEMATICS
CHAPTER# 02
Q.1: Define mechanics.
Ans: Mechanics:
The branch of physics which is related to the study of the motion of objects is called Mechanics. It is divided into two parts:
(i) Kinematics
(ii) Dynamics
PHYSICS 9TH - Short / Detailed Question Answers
PHYSICAL QUANTITIES AND MEASUREMENT
Chapter # 01
Ans: Science: The word science refers to the study of a fact by collecting information through observation, presenting it in a mathematical way, justifying the idea with experiment, and finally making a conclusion about the fact.
