1. A particle is moving in a circular path of radius r. The displacement after half a circle
would be:
(a) Zero. (b) π r
(c) 2 r. (d) 2π r
2. A car increases its speed from 20 km/h to 50 km/h in 10 seconds. What is its
acceleration?
3. A body is accelerating at a constant rate of 10m/s2
. If the body starts from rest, how
much distance will it cover in 2 seconds?
4. A particle is moving in a circle of diameter 5m. Calculate the distance covered and the
displacement when it competes 3 revolutions.
5. A farmer moves along the boundary of a square field of side 10 m in 40 s. What will be
the magnitude of displacement of the farmer at the end of 2 minutes 20 seconds?
6. Distinguish between speed and velocity.
7. Under what condition(s) is the magnitude of average velocity of an object equal to its
average speed?
8. What does the odometer of an automobile measure?
9. What does the path of an object look like when it is in uniform motion?
10. When will you say a body is in (i) uniform acceleration? (ii) non-uniform acceleration?
11. An athlete completes one round of a circular track of diameter 200 m in 40 s. What will
be the distance covered and the displacement at the end of 2 minutes 20 s?
12. Abdul, while driving to school, computes the average speed for his trip to be 20 km/h. On
his return trip along the same route, there is less traffic and the average speed is 40 km/h.
What is the average speed for Abdul’s trip?
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Answers
Answer:
8.
Odometer is a device that measures the distance travelled by an automobile based on the perimeter of the wheel as the wheel rotates.
9.
When the object is in uniform motion, it covers equal distance at equal intervals of time.
10.
(1)When a body is changing its velocity at a constant rate, then the body is said to be moving with uniform acceleration.
(2)When a body is changing its velocity at different rates, then the body is said to be moving with non-uniform acceleration.
11.
2min20sec means 140sec means the athlete can complete 140/40=3.5 round.
So distance=3.5×πd=3.5×3.14×200m=2198meter
Displacement will be just diameter, d=200m
after completing third round it will be at the opposite end of a track
12.
26.66
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Answer:
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