Exercise
Objective Questions
1. The motion of minute hand of a clock is an example of:
2. Mohan and Rama move along the same path with different speeds. If Mohan is slower than Rama then he will cover:
3. Which of the following shows periodic motion?
4. Which is an example of rectilinear motion?
5. Weight of an object on the Earth will be _____ that on the Moon.
Fill in the blanks
1. A bike turning around at a traffic signal describes a ______ motion.
2. The SI unit of amplitude is ______.
3. The to-and-fro motion of a pendulum in a clock is an example of ______ motion.
4. Weight of the object on the Earth is around ______ as that on the Moon.
5. Acceleration due to gravity on Earth is maximum at the ______.
True or False
1. The SI unit of frequency is second.
2. Distance covered by a body in unit time is called its time period.
3. Time period of the oscillation of a simple pendulum is not dependent on its mass.
4. Frequency can be calculated by finding reciprocal of time period of a pendulum.
5. Non-uniform motion refers to the equal distance covered in equal intervals of time.
Answer in One Word
1. One complete to-and-fro motion about a mean position.
2. The number of complete oscillations made per second.
3. Rate of change of velocity.
4. The length of the path covered by a body in motion.
5. The force with which a body is attracted towards the centre of Earth.
Assertion-Reasoning
1. Assertion: A person sitting in a moving bus is at rest relative to other passengers.
Reason: Rest and motion are relative terms.
2. Assertion: The weight of an object changes from one place to another.
Reason: The mass of an object remains constant irrespective of its location.
Application / Values
Harsh hired a rickshaw from airport to his house. The driver A took the shortest path and charged Rs. 50. Another driver B took a longer path and charged Rs. 100.
Are the displacement and distance same? What values are shown by driver A and driver B?
Driver A shows honesty, Driver B shows dishonesty. ✅
Subject Bridge
Geography: The weight of an object is different at different locations on the globe. It is maximum at the poles and minimum at the equator.
History: In earlier times, pendulum clocks were used as the most precise timekeeping devices.
Investigate
Read the data and construct a distance-time graph.
10 min → 5 km
20 min → 10 km
30 min → 15 km
40 min → 20 km
50 min → 25 km
Is the line straight? Is the average speed same for the entire journey?
