The basic unit of speed is

What is the relation between distance and speed?

How will you convert the speed given in km/h to m/s?

If we denote speed by S, distance by D and time by T, the relationship between these quantities is

Boojho walks to his school which is at a distance of 3 km from his home in 30 min. On reaching, he finds that the school is closed and comes back by a bicycle with his friend and reaches home in 20 min. His average speed in km/h is

One millionth second is

A solar day is

Time between one sunrise and the next sunrise was called a_______________

Time period of a pendulum depends on its_____________.

The symbols of all units are written in_____________

A________________is one billionth of a second.

Motion of objects can be represented in the pictorial form by their__________graph.

Shadow of an object is__________at noon

Motion and__________are relative terms

The unit of speed is ..................

When does a motion become uniform or nonuniform?

What is a stop watch?

What devices are fitted in vehicles to record speed or distance?

On what factors the time period of pendulum depends?

A simple pendulum takes 45 see to complete 30 oscillations. What is the time period of the pendulum ?

Mention which is the most common thing in almost all the clocks.

If you did not have a clock, how would you decide what time of the day is?

State the condition under which the distance-time graph of an object is a horizontal line parallel to the axis of time.

State the way through which we can prepare a pendulum by our own.

What is a sundial?

Classify the following as motion along a straight line, circular or oscillatory motion.
(a) Motion of your hands while running.
(b) Motion of a horse pulling a cart on a straight road.
(c) Motion of a child in a merry-go-round.
(d) Motion of a child on a see-saw.
(e) Motion of the hammer of an electric bell.
(f) Motion of a train on a straight bridge.

Which of the following are not correct?
(a) The basic unit of time is second.
(b) Every object moves with a constant speed.
(c) Distances between two cities are measured in kilometres.
(d) The time period of a given pendulum is not constant.
(e) The speed of a train is expressed in m/h.

The distance between two stations is 240 km. A train takes 4 h to cover this distance. Calculate the speed of the train.

Describe various methods used to measure time in earlier days.

Explain by giving example that how can we choose a suitable scale.

Distance between Bholu's and Golu's house is 9 km. Bholu has to attend Golu's birthday party at 7 0' clock. He started his journey from his home at 6 0' clock on his bicycle and covered a distance of 6 km in 40 min. At that point, he met Chintu and he spoke to him for 5 min and reached Golu's birthday party at 7 0' clock. With what speed, did he cover the second part of the journey? Calculate his average speed for the entire journey.