Introduction to Motion

Q.

Question 17

While travelling in a train, it appears that the trees near the track are moving whereas co-passengers appear to be stationary. Explain the reason.

Q. The motion in which a body moves in a straight line is called ______ motion.

1. circular
2. rotational
3. oscillatory
4. rectilinear

Q.

Define motion and give an example?

Q.

Define the following:

1) Rectilinear motion

2) Circular motion

3) Curvilinear motion

Q. Which of the following statements is INCORRECT?

1. Motion cannot be defined without a reference point.
2. The Earth is moving with respect to a man in space.
3. With respect to a man on Earth, the Sun is moving.
4. The Moon is at rest with respect to a man on Earth.

Q.

Give reasons for the following:

A man walking is said to be in motion.

Q.

Motion and rest are relative. How do you justify this?

Q.

Give 10 examples each of body under rest and body under motion.

Q. Raj is waiting for his bus at the bus stop. Which of the following observe Raj to be in motion?

1. A passenger in a moving bus
2. A passenger in a standing bus
3. A passenger walking towards the bus stop
4. Another passenger waiting for the bus

Q.

What do you understand by the term motion?

Q.

When is an object said to be in motion? Give two examples.

Q.

Assertion (A): Equilibrium means either the body is at rest (static equilibrium) or in uniform motion (dynamic equilibrium).

Reason (R): When the resultant force is zero or there is no unbalanced force, the body is said to be in equilibrium.

1. $A$ and$R$are true and $R$ is the correct explanation of $A$

2. $A$ and $R$ are true, but $R$is not the correct explanation of $A$

3. $A$ is true but $R$is false

4. Both$A$and $R$ are false

Q. Which of the following statements are correct?

1. A particle is known to be at rest if it does not change its position with time.


2. The concept of motion is invalid without a reference point.


3. Speed = Distance $\times$ Time taken

1. 1, 2
2. 2, 3
3. 1, 2, and 3
4. 1, 3

Q. (a) Classify the following as motion along a straight line, circular or oscillatory motion:

• Motion of your hands while running
• Motion of a horse pulling a cart on a straight road
• Motion of a child in a merry-go-round

(b) The distance between two stations is 240 km. A train takes 4 hours to cover this distance. Calculate the speed of the train. [5 marks]

Q.

A body is said to be in motion__.

1. When it changes its position

2. When it does not changes its position

3. Both A and B

4. When it changes its position with respect to an observer

Q. Identify any two types of motion happening in a car moving with a constant speed around a rectangular path.

Q. Which of the following is the common characteristic of all moving bodies?

1. They do not change their position with time.
2. They change their position with time.
3. They always travel with uniform speed.
4. They always move in a circular path.

Q. Which of the following statements are correct?

1. A particle is known to be at rest if it does not change its position with time.


2. The concept of motion is invalid without a reference point.


3. Speed = Distance $\times$ Time taken

1. 2, 3
2. 1, 2
3. 1, 2, and 3
4. 1, 3

Q.

An object is observed from two points A and B. The object changes its position continuously with respect to A. However, the position of the object is constant with respect to B. Which of the following is/are true?

1. The object is in motion with respect to B.

2. The object is in motion with respect to A.

3. The object is at rest with respect to B.

4. The object is at rest with respect to A.

Q.

What is the formula of time in terms of distance and velocity?

Q. In which of the following case(s) can we say that the object is in motion?

1. Only if the object moves toward with respect to the observer.
2. If the object changes its position with respect to the observer.
3. Only if the object moves away with respect to the observer.
4. If the object doesn't change its position with respect to the observer.

Q.

Two people are sitting inside a moving car. Since the car is moving, one person is in motion with respect to the other.

1. False

2. True

Q.

Suppose you and your friend are sitting in a moving car. Then your friend is in motion with respect to ___.

1. you

2. a person standing on the road

3. car

4. anyone

Q.

How do you define rest?

Q. Assume you are travelling in a bus. There is a traffic light in the line of sight of the driver. What is the direction in which the traffic light moves from your point of view?

1. Towards the bus
2. To the left
3. Away from the bus
4. To the right

Q.

What can you say about the motion of a clock's minute hand kept in a moving bus as seen from the ground?

1. Rectilinear motion

2. Complex motion

3. none of the above

4. Circular motion

Q.

Comment on the statement ‘rest and motion are relative terms. Give an example.

Q.

What is the meaning of limiting equilibrium?

Q.

An object is observed from two points A and B. The object changes its position continuously with respect to A. However, the position of the object is constant with respect to B. Which of the following is/are true?

1. The object is in motion with respect to B.

2. The object is in motion with respect to A.

3. The object is at rest with respect to B.

4. The object is at rest with respect to A.

Q.

Classify the following into different types of motion:

1)The motion of man on a straight road.

2)The motion of wheels of a car.

3)The motion of a vertically falling stone. [3 MARKS]