# NCTB Class 6 Science Chapter 10 Motion Solution

## NCTB Class 6 Science Chapter 10 “Motion” Solution

Bangladesh Board Class 6 Science Solution Chapter 10 Motion Solution  Exercises Question and Answer by Experienced Teacher.

### NCTB Solution Class 6 Chapter 10 “Motion”:

 Board NCTB Bangladesh Board Class 6 Subject Science Chapter Ten Chapter Name Motion

### Chapter 10 “Motion” Solution

Fill in the blanks:-

(1) The motion of an object sliding over inclined plane is called—– motion.

Ans:- Translational.

(2) The motion of rolling marble is —— motion.

Ans:- Translate – rotatory.

(3) The rate change of —- of an object with time is called its acceleration.

Ans:- Velocity.

(4) —— have both magnitude and direction.

Ans:- Velocity.

Write the kinds of motions in each of the following cases:-

(1) The motion of the wheel of a running bus.

Ans:- The motion of the wheel of a running bus— Translate – rotatory motion.

(2) The motion of the cradle.

Ans:- The motion of the cradle— Oscillatory motion.

(3) The motion of the pedal of bi-cycle.

Ans:-  The motion of the pedal of bi-cycle— Rotational motion.

(4) The motion of earth about its own axis.

Ans:- The motion of earth about its own axis — Rotational motion.

(5) The motion of ear in zigzag road.

Ans:- The motion of ear in zigzag road— Translational motion.

Multiple choice question:-

(1) The rate of change of displacement with time is called—

Ans:- (b) Velocity.

(2) The motion of the clock’s is —–

Ans:- (d) Periodic motion.

(3) The distance traversed by Rimi—–

Ans:- (8+6) = 2meters.

(4) Rimi’s displacement was —

Ans:- (8-6) = 2 meters.

(1) Ans:- If an object travels a certain distance of its path from the same direction aft certain definite intervals of time repeatedly, the motion is called a periodic motion.

• Example: The motion of clock hands, electric fan.

(2) Ans:- The difference between national motion and Translate -rotatory motion is, in national motion, an object travers in a circular path but in case of trans. Rotational motion, an object travers in circular and linear path at same time.

(3) Ans:- Displacement is the linear minimum distance between initial and final position of an object in a particular direction.

(4) Ans:- The difference between speed and velocity is the distance travelled by an object in unit time is called its speed but the speed in a particular direction is called velocity.

(5) Ans:- The difference between acceleration and retardation is – acceleration is the rate increase of velocity with time, but retardation is the rate of decrease in velocity.

Creative Question:

(1) (a) Ans:- I an object passes certain of its path from the same direction after certain definite intervals of time repeatedly, then the motion is called a periodic motion.

(1) (b) Ans:- The motion of wall clock’s pendulum is oscillatory motion.

(1) (c) Ans:- The distance between school and Khusbu’s house is 1500 meter

The time taken by Khusbu to reach school from house is 15 minute (15 minute = 15×60 = 900sec)

Therefore, The speed of Khusbu is =

=  = 1.66ms-1

(1) (d) Ans:- The speed of Hridita is =  =  = 1.5ms-1

The speed of Sawdicha is =  =  =1.16ms-1

Therefore, Hridita speed id faster.

(2) (a) Ans:- When an object does not change its position with time, relative to an observer than object is at rest.

(2) (b) Ans:-The reference frame is such a specified object or point, relative to which the rest or motion of on object is determined.

(2) (c)

Ans:- The particle is moving from A to C in

(AB+BC) = 3+1 = 4 second

Therefore the velocity of the particle is =

= 8 ms-1

Updated: November 10, 2020 — 10:20 am