What is meant by uniform motion ? Can you think of an example of a body in uniforim motion ?
A body has a uniform motion, if if thavels equal distances in equal intervals of time. no mattor how small these time intervals mav be example, a car running at constant speed of say, $10$ metres per second, will cover equal distances of $10$ metres, every second, so its motion will be uniform. The distance$-$time graph for uniform motion is a straight line.
Mention the nature of motion of a body if its displacement$-$time graph is a straight line parallel to time axis.
A driver of a train travelling at $40\, m s ^{-1}$ applies the breaks as a train enters a station. The train slows down at a rate of $2\, m s ^{-2} .$ The platform is $400\, m$ long. Will the train stop in time ?
If the displacement-time graph for a particle is parallel to displacement axis, what is the velocity of the particle ?
Under what condition will the magnitude of the displacement be equal to the distance travelled by an object ?
$(a)$ Define circular motion.
$(b)$ "Uniform circular motion is an accelerated motion". Justify this statement with reason.
$(c)$ An artificial satellite is moving in a circular orbit of radius $42250\, km.$ Calculate its speed if it takes $24$ hours to revolve once around the earth.