Maharashtra Board Solutions for Chapter: Motion, Force and Work, Exercise 6: Exercise

_____ is the distance traversed by a body in a particular direction in unit time. 

(stationary, zero, changing, constant, displacement, velocity, speed, acceleration, stationary but not zero, increases)

Observe the figure and answer the questions.

Sachin and Sameer started on a motorbike from place A, took the turn at B, did a task at C, travelled by the route CD to D and then went on to E. Altogether, they took one hour for this journey. Find out the actual distance traversed by them and the displacement from A to E. From this, deduce their speed. What was their velocity from A to E in the direction AE? Can this velocity be called average velocity?

From the groups B and C, choose the proper words for each of the words in group A.

A bird sitting on a wire, flies, circles around and comes back to its perch. Explain the total distance it traversed during its flight and its eventual displacement.

Explain the following concepts in your own words with everyday examples: force, work, displacement, velocity, acceleration, distance.

A ball is rolling from A to D on a flat and smooth surface. Its speed is $2 \mathrm{cm}/\mathrm{s}$. On reaching B, it was pushed continuously up to C. On reaching D from C, its speed had become $4 \mathrm{cm}/\mathrm{s}$. It took $2$ seconds for it to go from B to C. What is the acceleration of the ball as it goes from B to C?

A force of $1000 \mathrm{N}$ was applied to stop a car that was moving with a constant velocity. The car stopped after moving through $10 \mathrm{m}$. How much is the work done?

A cart with mass $20 \mathrm{kg}$ went $50 \mathrm{m}$ in a straight line on a plain and smooth road when a force of $2 \mathrm{N}$ was applied to it. How much work was done by the force?