VR Tour For Std. 7 Ch. 13. Motion and Time
What's Included in Virtual tour of this chapter
In our day to day life, we see many moving objects. Some objects move slow and some fast. So, let’s understand the slow and fast motion of moving objects. We will also learn about the time measuring devices which use the concept of periodic motion to measure time. We will also understand how to calculate the speed of an object. In our day to day lives, we see many moving objects. These movements are known as motion. In this chapter, we will understand about uniform and non-uniform motion.
Virtual tour 1: Slow motion or Fast motion
If an object covers more distance in the fixed time, the object is said to be moving faster and its motion is called fast motion. If an object covers less distance in the fixed time, the object is said to be moving slower and its motion is called slow motion. We will understand this with the help of an activity.
Virtual tour 2: Measurement Of Time
We use different types of the clock to measure time. Clocks use the concept of periodic motion to measure time. The different types of time measuring devices like Sundial, sand clock, water clock, Pendulum Clock and Quartz Clocks work on the same principle. The basic unit of time is the second. The other units are minutes, hours, days, weeks, months and years.
Virtual tour 3: Speed and its measurement
In this virtual tour activity we will learn how to find the speed of any object. The speed is equal to Distance covered by the object divided by the time taken to cover that distance. We will understand how to calculate the speed with the help of an example.
Virtual tour 4: Units of speed
The distance moved by an object in a unit time is called its speed. Speed can be measured in kilometers per hour or meters per second. Meters per second is used for shorter distance while kilometer per hour is used for long-distance.
Virtual tour 5: Uniform motion
When an object moves along a straight line with constant speed is called uniform motion. While an object moves along a straight line but with variable speed is called non-uniform motion.
Virtual tour 7: Non-Uniform motion
The distance moved by an object in a unit time is called its speed. Graphs provide a convenient method to represent basic information about various events. To describe the motion of an object, we can use line graphs. The distance-time graph indicates the type of motion. If the distance-time graph is a straight line, it indicates the uniform motion and if it is not straight, it indicates the non-uniform motion.