145
c. weight of a tennis ball
i. less than 1 kg ii. about 1 kg iii. more than 1 kg
d. length of a wall
i. less than 1 m ii. about 1 m iii. more than 1 m
SPEED
A snail is slow, but a rabbit runs fast. The terms ‘slow’ and ‘fast’ tell us about speed.
The speed of a person or object depends on the time taken by it to travel a certain distance.
Example 16: A car covers 260 km in 4 hours. What is the speed of the car?
Distance covered by the car = 260 km
Time taken to cover the distance = 4 hours
Speed of the car = = = 65 km/h
So, the speed of the car is 65 km/h.
What is my speed?
a. b.
My speed is km/h. My speed is km/h.
c. d.
My speed is km/h. My speed is km/h.
23
Distance
Time
Speed =
Distance
Time
I can cover 100 km in 5 hours.
I can cover 40 km in 4 hours.
I can cover
180 km in
4 hours.
I can cover
600 km in
12 hours.
length: measurement of the distance between two points
weight: heaviness of an object
capacity: here, amount of liquid that a container can hold
Grasping
better
Connecting
better
Social Studies
After lunch, the weather suddenly changed. Ryan asks, “Appa, what happened? Why did the weather suddenly change?”Appa replies, “According to the Meteorological Department, it will rain now.” “How does the Meteorological Department forecast weather?” Ryan asks. “They use forecasting tools, such as satellite, radar and surface maps,” Appa replies.