Question

Q1. (a) Define displacement of a particle in linear motion. Does it depend upon the choice of origin? (b) Define distance covered by a particle in a given time. Is it is equal to displacement?
Q2. What do you mean by uniform and nonuniform motion? What can be the shape of path covered by a a moving object to have (a) uniform speed (b) uniform velocity?

Q3. A girl while riding a bicycle moves with the speed of 10 km per hour for 2 hours and with the speed of 15 km per hour for next 3 hours. Find the total distance covered by her and her average speed.

Q4. A train covers half of its journey with a speed of 30 metre per second and the other half with a speed of 40 metre per second. Calculate the speed of the train during the whole journey.

QS. Answer the following questions:
(a) state the type of motion shown by a freely falling stone.
(b) when a stone is thrown vertically upward, its velocity is continuously decreases. Why?
(c) give an example of a motion in which average velocity is zero, but the average speed is not zero.

Q6. Draw velocity time graphs of the following cases:
(a) when the object is in uniform motion
(b) when the object has uniformly retarded velocity
(c) when the object is in uniformly accelerated motion with initial velocity non zero.
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Answer 1

Answer:

Explanation:

a) The displacement of a particle in linear motion refers to the maximum distance travelled by an object or a body from its mean position to the final position.

b)Speed is the distance covered by a body in a given time . Yes, distance can be equal to displacement only when the path is in linear motion i.e. straight line motion.

2.When a body covers equal distances in a straight line, equal intervals of time are called uniform motion. Example: a car moving at 20km/h in a straight line. When a body covers unequal distance in equal intervals of time in a straight line is called non-uniform Example : spinning wheel.