1) Distinguish between uniform velocity and variable
velocity
2) Distinguish between average speed and average
velocity
3)Give an example of motion of a body moving with a
constant speed, but with a variable velocity. Draw a
diagram to represent such a motion.
4) Give an example of motion in which average speed
is not zero, but average velocity is zero.
5) Define acceleration. State its S.I. unit.
Answers
Answer:
1) when a body covers equal distance in equal interval of timein a specific direction it is said to have uniform velocity . variable velocity: when a body.
covers unequal distance in equal interval of time in a specified direction , it is said to have non-uniform velocity .
2) Average speed is total displacement per unit time while average velocity is total distance travelled per unit time.
3) The motion of a body in a circular path with uniform speed has a variable velocity because in the circular path, the direction of motion of the body continuously changes with time.
4) When the object travels in a circular path, or in a path which has the initial point and final point the same ( like car race track) the average speed is not zero but average velocity is zero.
5) Acceleration is the rate of change of velocity of an object with respect to time. ... The SI unit for acceleration is metre per second squared (m s−²).