Question

define the following
1) energy
2) uniform motion​

Answer 1

Answer:

Solution

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A body is said to be in motion when its position changes continuously with respect to a stationary object taken as a reference point.

Uniform Motion: A body has uniform motion if it travels equal distances in equal intervals of time, no matter how small these time intervals may be. For example- a car running at a constant speed of 10 m/s will cover equal distance of 10 m every second, so its motion will be uniform.

Non−uniform motion: A body has a non-uniform motion if it travels unequal distances in equal intervals of time. For example: dropping a ball from the roof of a tall building.

(a) The speed of a body is the distance travelled by it per unit time. The SI unit of speed is rn/s.

(b)

(i) The average speed of a body is the total distance travelled divided by the total time taken to cover this distance.

(ii) Uniform speed refers to the constant speed of a moving body. A body has a uniform speed if it travels the equal distance in equal intervals of time.

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Answer 2

Answer:

1) The capacity to do work is called energy.

2) If an object is travelling with uniform motion, it is moving in a straight line at a constant speed.