# Speed and Velocity Class-7th Goyal Brothers Physics Solutions Ch-2 Unit- 2

Speed and Velocity Class-7th Goyal Brothers Physics Solutions Chapter-2. We Provide Step by Step Answers of Objective, True False , Fill in the blanks, Match the following , Study Questions of Chapter-2 Force and Pressure Unit-2(Speed and Velocity) Visit official Website  for detail information about ICSE Board Class-7.

## Physics Solutions Ch-2 Unit-2

 Board ICSE Class 7th Subject Physics Book Name Goyal Brothers Theme-2 Force and Pressure Unit-2 Speed and Velocity Topic Solution of exercise questions Session 2023-24

### OBJECTIVE TYPE QUESTIONS

#### A. Fill in the blanks :

1. The distance covered by a body in unit time in a specified direction is called _velocity_.
2. The distance covered by a body in unit time is called _speed_.
3. When a body covers equal distances in equal interval of _time_ in a specified direction, it is said to be moving with uniform velocity.
4. The weight is found by a _spring_ balance.
5. The weight of a body can be _zero_ but not the mass.

#### 1. Distance covered by a body in unit time in a specified direction is called its speed.

Correct Statement: Distance covered by a body in unit time in a specified direction is called its velocity.

#### 2. When a body covers unequal distances in equal interval of time, it is said to be moving with variable velocity.

Correct Statement: When a body covers unequal distances in equal interval of time, it is said to be moving with variable velocity.

#### 3. When a body covers equal distances in equal intervals of time in a specified direction, it is said to be moving with uniform speed.

Correct Statement: When a body covers equal distances in equal intervals of time in a specified direction, it is said to be moving with uniform speed.

#### 4. A freely falling stone has uniform velocity.

Correct Statement: A freely falling stone has uniform velocity.

#### 5. Milligram is a multiple of kilogram.

Correct Statement: Milligram is a sub-multiple of kilogram.

#### C. Write ‘True’ or ‘False’ for the following statements :

1. When a body starts from rest its initial velocity is zero. [T]
2. The submultiple of kilogram is quintal. [F]
3. The acceleration due to gravity is 981 cms-2 . [T]
4. A horse covering 50 m in 5 s in a straight line has a velocity of 10 ms-1 . [F]
5. The weight of a body can never be zero. [F]

#### 1. SI unit of weight is :

(a) Kilogram force

(b) gram force

(c) newton

(d) dyne

Ans: (c) newton

(a) pressure

(b)Mass

(c) force

(d) weight

Ans: (b)Mass

(a) cms-1

(b) cms-2

(c) ms-2

(d) ms-1

Ans: (d) ms-1

#### 4. The SI unit of mass is :

(a) milligram

(b) kilogram

(c) gram

(d) quintal

Ans: (b) kilogram

#### 5. A body weighs 2 kgf at equator. Its weight at the poles will be :

(a) same as equator

(b) more than 2 kgf

(c) less than 2 kgf

(d) zero

Ans: (b) more than 2 kgf

#### 5. Speed

 Column A Column B 1. Distance covered by a body in unit time. 5. Speed 2. The amount of matter contained in a body. 4. Mass 3. A physical quantity whose magnitude can be zero. 2. Weight 4. Distance covered by a body in unit time, in a specified direction. 1. Velocity 5. A body covering unequal direction in equal interval of time, in a specified direction. 3. Variable velocity

### STUDY QUESTIONS

#### Question 1. Define (a) speed, (b) velocity. Bring out clearly the difference between the speed and velocity.

(a) The rate of change of motion is called speed.

(b) The rate of change of motion in a specified direction is called its velocity.

The difference between speed and velocity –

 Speed Velocity 1. The rate of change of motion is called speed. 1. The rate of change of motion in a specified direction is called its velocity 2. It is a scalar quantity. 2. It is a vector quantity. 3. It cannot be zero. 3. It can be zero. 4. Speed = Distance/Time 4. Velocity = Displacement/Time

#### Question 2. Give an example of body moving with (a) uniform velocity (b) variable velocity. Define the both terms.

(a) Uniform Velocity: A body is said to be moving with uniform velocity if its average velocity between any two points along its path is the same in magnitude as well as direction.

example: A car moving on a straight road and covers 10 m in every second.

(b) Variable Velocity: When the displacement of the body is different in equal interval of time then the velocity is called variable velocity.

example: A freely falling stone is moving with a variable velocity.

#### Question 3. Define mass. State SI unit of mass.

Answer: Mass is the amount of matter contained in the body. It is a constant quantity for a given substance. The mass is found by using a beam balance or a physical balance.

The SI unit of mass is kilogram (Kg).

#### (a) Define weight

Answer: Weight is the force with which the earth pulls a body towards its center. The weight of a body is not a constant quantity, but depends upon the acceleration due to gravity acting on the body.

#### (b) State and define SI unit of weight.

Answer: SI unit of weight is Newton (N) . The amount of force acting on a body, when earths pulls a mass 100 g is equals to one Newton.

#### Question 5. State four differences between mass and weight.

Answer: Difference between mass and weight.

 Mass Weight 1.Mass is the amount of matter contained in a body. 1.Weight is the force with which the earths attracts a body towards its centre. 2. Mass is a scalar quantity 2. Weight is a vector quantity 3. SI unit of mass is Kilogram (Kg). 3. SI unit of Weight is Newton (N). 4. Mass of a body can never be zero. 4.  Weight of a body can be zero.

— : end of Speed and Velocity Class-7th ch-2 unit-2 Goyal Brothers :–-

Return to- ICSE Class -7 Goyal Brothers Physics Solutions

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