A stone is dropped from a height of 20 m above the ground. Will it have a uniform or non-uniform speed, as it moves towards the ground? Open Answer »
With the help of an activity, explain how will you measure the time period of a simple pendulum. Open Answer »
Boojho goes to the football ground to play football. The distance-time graph of his journey from his home to the ground is given in figure.Q1. What does the graph between point B and C indicate about the motion of Boojho? Q2. Is the motion between 0 to 4 minutes uniform or non-uniform? Q3. What is his speed between 8 and 12 minutes of his journey? Open Answer »
Distance between Bholu’s and Golu’s house is 9 km. Bholu has to attend Golu’s birthday party at 7 o’clock. He started from his home at 6 o’clock on his bicycle and covered a distance of 6 km in 40 minutes. At that point he met Chintu and he spoke to him for 5 minutes and reached Golu’s birthday party at 7 o’clock. With what speed did he cover the second part of the journey? Calculate his average speed for the entire journey. Open Answer »
Plot a distance-time graph of the tip of the second hand of a clock by selecting 4 points on x-axis and y-axis respectively. The circumference of the circle traced by the second hand is 64 cm. Open Answer »
Starting from A, Paheli moves along a rectangular path ABCD as shown in figure below. She takes 2 minutes to travel each side. Plot a distance-time graph and explain whether the motion is uniform or non-uniform. Open Answer »
The average age of children of Class VII is 12 years and 3 months. Express this age in seconds. Open Answer »
Complete the data of the table given below with the help of the distance-time graph given in figure. Distance (m) 0 4 ? 12 ? 20 Time (s) 0 2 4 ? 8 10 Open Answer »
Explain with the help of an example that the states of rest and motion are relative terms. Open Answer »