When a body covers unequal distance in equal interval of time then the motion is said to be?

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Learning Elementary Science for Class 7>Time and Motion>EXERCISES>Q I

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1. Motion:

(i) Motion and rest are relative terms.

(ii) Reference point is the initial point from which a body starts moving.

(iii) When the position of a body changes continuously with respect to time and a reference point, the body is said to be in motion.

2. Speed:

(i) Speed is the rate of change of motion.

(ii) Speed=Total distance coveredTotal time taken

(iii) The basic unit of speed is m/s.

(iv) When a body covers equal distances in equal intervals of time, the body is said to be in uniform motion.

(v) When a body covers unequal distances in equal intervals of time, the body is said to be in non-uniform motion.

(vi) Speedometer present on the dashboard of a vehicle record speed in km/h.

(vii) Odometer is used to measure the distance.

3. Time:

(i) Time is defined as a gap between two events.

(ii) Second is the SI unit of time. It is equal to 186400th part of the solar day.

(iii) Time between the two successive noons is called solar day and is an ancient unit of time.

(iv) Ten years is equal to one decade, hundred years is equal to one century and thousand years is equal to one millennium.

(v) A body casts the longest shadow during sunrise or sunset and the smallest shadow during noon.

4. Devices to measure time:

(i) The stopwatch is a watch which can be started or stopped when desired. It is used to measure small intervals of time.

(ii) A digital clock is a clock in which time is displayed in digits by electronic circuits.

(iii) Sundial is a device used for measuring time, by measuring the length of shadow during the daytime.

(iv) Four sundials exist in India, i.e., in Jaipur, Varanasi, Ujjain and Delhi.

(v) Gnomon is a triangular plate fitted vertically on the horizontal surface of a sundial.

(vi) The sand clock is a device used by Romans to measure time. It works on the principle that a fixed mass of sand falls through a small hole in a fixed interval of time.

(vii) A sand clock is commonly called hourglass.

5. Pendulum:

(i) Pendulum is a heavy mass, called bob suspended from a rigid support using a string. When pulled to a side and released it oscillates about mean position.

(ii) Pendulum executes a periodic motion.

(iii) One oscillation means one to and fro motion of a pendulum about its mean position.

(iv) Time period is the time taken up by a pendulum to complete one oscillation.

6. Distance-Time graph:

(i) The motion of objects can be presented in pictorial form by their distance-time graphs.

(ii) The distance-time graph for the motion of an object moving with a constant speed is a straight line.

(iii) Bar graph and pie graph are also used to depict data.

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