Fill in the blanks: a) A car starts at rest and travel a distance 20 m in 1 sec .The car average speed is ___________. b) Motion of earth around sun is an example of __________ motion. c) Tractor moving with 18 km/h is _______ then car moving with 1500 m/min. d) The motion of a free falling body is an example of __________ motion. e) The curved speed time graph represent ________ accelerated motion. f) Distance is a _______quantity while displacement is a _____________ quantity.
Answers
a) Average speed of the car is 20m/
b) Since, Earth rotates around the earth with a constant speed of 30km/sec , its motion can be termed as circular motion. It must be kept in mind that Earth's orbit is not circular but elliptical. This motion of earth is revolution
c) Slower' because 18km/h is actually 300m/min which is actually less than the car which is at a speed of 1500m/min
d) The motion of a freely falling body is an example of uniformly accelerated motion. The motion of the body where the acceleration is constant is known as uniformly accelerated motion.
e) If a position graph is curved, the slope will be changing, which also means the velocity is changing. Changing velocity implies acceleration. So, curvature in a graph means the object is accelerating, changing velocity/slope.
f) distance is a scalar quantity while displacement is a vector quantity.