IV. Very short answer type questions.
1. What is the SI unit of time?
2. How much time to be taken by a pendulum to complete one oscillation?
3. How does a body covering unequal distances in equal intervals of time?
4. Name the device that is used by the Romans to measure time.
5. What do you say it when a car is moving at a constant speed?
V. Short answer type questions.
1. How are distance, time and speed of a moving object related to each other?
2. Convert 36 km/h to m/s.
3. When is an object said to be in non-uniform motion?
4. What do you mean by the time period of a pendulum?
5. Define speed of a body.
VI. Long answer type questions.
1. Distinguish between uniform motion and non-uniform motion.
Answers
Answer:
1) seconds
2) time period
3) non uniform motion
4) The Romans also used water clocks which they calibrated from a sundial and so they could measure time even when the sun was not shining, at night or on foggy days. Known as a clepsydra, it uses a flow of water to measure time
5)an object is moving at a constant speed in a straight line then again the forces are said to be balanced
v. short answer
1)The speed of a moving body is the distance travelled by it in unit time. ... If the distance is in km and time is in hours, then the speed is km/hr. If the distance is in m and the time is in seconds, then the speed is m/sec.
2)10 metres per second
3)This type of motion is defined as the motion of an object in which the object travels with varied speed and it does not cover same distance in equal time intervals, irrespective of the time interval duration.
4)A point mass M suspended from the end of a light inextensible string whose upper end is fixed to a rigid support. The mass displaced from its mean position
ln other words time taken by a pendulum to complete one ossilation
5)speed of body is equal to Total distance travelled by the body by total time taken to travel that distance... its SI unit is kilometres per hour or miles per hour or metre per second.
Vl. long type questions
1)
