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# Motion-Time-theory Physics-day-2 Target ssc cgl 2018

Motion-Time-theory Physics-day-2 Target ssc cgl 2018

MOTION AND TIME

Types of Motion

Uniform motion

The motion in which an object covers equal distance in equal intervals of time is called uniform motion.

Non-uniform motion

The motion in which an object covers an unequal distance in equal intervals of time is called non-uniform            motion.

Rectilinear motion

When an object moves along a straight line, it is called a rectilinear motion.

Circular motion

When an object moves along a circular path, it is called a circular motion. Rotational motion

When an object turns about a fixed axis, it is called rotational motion.

Periodic motion

The motion which repeats itself after regular intervals of time, is called periodic motion.

Distance

Actual path covered by a body is called the distance travelled by it.

Displacement

Shortest distance between the final and the initial position of the body is called displacement.

Speed

It is the distance traveled by an object per unit time. S.I. unit of speed is m/s.

Speed = Distance/time

Velocity

Velocity is defined as the displacement of the object per unit time. S.I. unit of velocity is m/s.

Velocity = Displacement/time

Acceleration

Rate of change of velocity is known as acceleration. Its S.I. unit is m/s2.

Acceleration = Change in velocity/time

TIME

Time is a moment or duration in which things occur.

Measurement of time in Ancient times

• Sundial….A sundial measures time by the position of the shadow cast by the Sun.
• Sand clock (commonly known as hour-glass).
• Water clock

Unit of time

The S.I. unit of time is second.

SIMPLE PENDULUM

• A simple pendulum consists of a small metal ball suspended by a long thread from a rigid support, such that the bob is free to swing back and forth.
• If the length of the string is kept constant, a pendulum completes every oscillation in exactly the same time.
• To-and-fro motion of a pendulum is called oscillatory or periodic motion.

Measurement of Time

• Earlier, pendulum clocks were used to measure time.
• Nowadays, the regular oscillations of a tine quartz crystal are used for measuring time. What you have learnt

• The distance moved by an object in a unit time is called its speed.
• Speed of objects help us to decide which one is moving faster than the other.
• The speed of an object is the distance travelled divided by the time taken to cover that distance. Its basic unit is metre per second (m/s).
• Periodic events are used for the measurement of time. Periodic motion of a pendulum has been used to make clocks and watches.
• Motion of objects can be presented in pictorial form by their distance-time graphs.
• The distance-time graph for the motion of an object moving with a constant speed is a straight line.

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