Q1.
Give two points of differences between speed and velocity.
Q2.
Under what conditions is the magnitude of average velocity equal to its average speed?
Q3.
What does the path of an object look like when it is in uniform motion?
Q4.
A car covers 30 km in 40 min and next 30 km in 50 min. Calculate the average speed of the entire journey in km/hr.
Q5.
Muskan takes 10 minutes to go from her house to school and 20 minutes for the return journey. If the distance between her school and house is 4 km, what is her
(i) average speed
(ii) average velocity
Q6.
In a long distance race the athletes were expected to take four rounds of the track such that line of finish was same as the line of start. Suppose the length of the track was 200 m.
(i) what is the total distance covered by the athlete?
(ii) What is the displacement of the athletes when they touch the finish line?
(iii) Is the motion of the athlete uniform or non-uniform?
(iv) If an athlete took 100 seconds to complete the race, what would be athlete’s average velocity? Justify your answer.
Q7.
Which of the following can sometimes be ‘zero’ for a moving body?
(i) Average velocity
(ii) Distance travelled
(iii) Average speed
(iv) Displacement
(a) Only (i) (b) (i) and (ii)
(c) (i) and (iv) (d) Only (iv)
Q8.
Which of the following statement is correct regarding velocity and speed of a moving body?
(a) Velocity of a moving body is always higher than its speed
(b) Speed of a moving body is always higher than its velocity
(c) Speed of a moving body is its velocity in a given direction
(d) Velocity of a moving body is its speed in a given direction
Q9.
In a free fall the velocity of a stone is increasing equally in equal intervals of time under the effect of gravitational force of the earth. Then what can you say about the motion of this stone? Whether the stone is having:
(a) Uniform acceleration
(b) Non-uniform acceleration
(c) Retardation
(d) Constant speed
Q10.
A bus travels from destination A to B with a speed of 36 km/h and then returns back to A with a speed of 72 km/h. The average speed of the bus is
(a) 54 km/hr (b) 108 km/hr
(c) 36 km/hr (d) 48 km/hr
