Science 1 Marks Question

Speedometer.

Objects that move in straight line and whose speed varies are said to be in non-uniform motion.

Before the discovery of pendulum clocks, sundials, water clocks and sand clocks were used.

It is useful in calculating the speed of the object and also tells the type of its motion.

To and fro motion of a simple pendulum.

On a see-saw child goes up and comes down from mean position and repeats itself. So there is oscillatory motion.

Motion of an object in a circular path is called circular motion e.g. Motion of the hands of a clock.

Boojho travels with a higher speed, as he has covered the same distance in lesser time than Paheii.

The time period of the simple pendulum is defined as the time required by the pendulum to complete one oscillation.

An odometer.

Meter.

A simple pendulum consists of a small metallic ball or a piece of stone suspended from a rigid stand by a thread The metallic ball is called the bob of the pendulum.

When the object is at rest, then the distance-time graph of an object is a horizontal line parallel to the axis of time.

By suspending a metal ball with the help of a cotton thread and the other end of the thread can be tied to some different supports, so in this way, we can prepare a pendulum by our own.

Oscillatory motion.

The most common thing in almost all the clocks is that all of them shows periodic motion.

Straight line motion.

Metre/ second is the basic unit of speed.

It is a special type of clock or watch which have an electric circuit with one or more cells are called quartz clocks.

A pendulum is a device which has a metallic ball (called bob) suspended by a long thread from a rigid support.

It indicates that the object is not moving (stationary).

One complete to and fro motion of a pendulum from rest position is called one oscillation.

The motion of bob is non-uniform, as it does not cover equal distance in equal intervals of time.

An object is said to be moving with variable speed or non-uniform speed if it covers equal distances in unequal intervals of time or vice-versa.

Simple Pendulum.

Speed is defined as the ratio of the total distance travelled by a body to the total time taken.

The to and fro motion of an object from the position of rest is called a Oscillatory motion.

Objects that move in a straight line and maintain the same speed throughout the distance covered are said to be in uniform motion.

Motion is a change in the position of an object with time.

A free falling body moves with a constant speed, i.e., speed of earth’s gravity. Thus, the stone will have a uniform motion.

distance-time graph.

Oscilatory motion.

We can decide time of the day without clock by seeing shadow formed by the sun, e.g. at noon, shadow formed by the sun is shorter than at evening.

Time interval of a month is measured by one new moon to the next.

If an object covers more distance in equal intervals of time with respect to other, then we can say that object is moving faster with respect to the other object.

Solar day is the most ancient unit of time in which it was earlier measured.

A quartz clock requires an electric cell for its working.

Pendulum.