Short Answer Questions
1 when do you say an object is in the state of motion?
2. What is linear motion? How is it different from rotational motion? Explain with one example.
3. Differentiate between rotation of an object and the revolution of an object.
4. What is oscillatory motion? Give at least two applications of oscillatory motion.
5 Define random motion with the help of an example,
6. How is the motion of a wheel of a moving bicycle and a mark on the blade pf a moving electric fan
different? Explain
Answers
1. When position of one object change with respect to another object with time then it is in motion or this phenomenon is called motion. For ex : a car is moving if its position is changing with respect to any other object say tree with the passage of time.
2. Linear motion involves an object moving from one point to another in a straight line. Rotational motion involves an object rotating about an axis. – Examples include a merry-go-round, the rotating earth, a spinning skater, a top, and a turning wheel.
3. When an object turns around an internal axis (like the Earth turns around its axis) it is called a rotation. When an object circles an external axis (like the Earth circles the sun) it is called a revolution.
4. Oscillation of simple pendulum. Vibrating strings of musical instruments is a mechanical example of oscillatory motion. Movement of spring.
5.It is an unpredictable type of motion in which an object moves in any direction and the direction changes continuously. Examples: The honey bee moves from one flower to another in search of nectar is also an example of random motion.
6. The wheel of a moving bicycle depicts circular as well as rectilinear motion whereas a blade of a moving electric fan shows only circular motion.