A moving car which moves straight on the road displays rectilinear motion.

Periodic motion - The bodies occupy a particular position at regular intervals, e.g. position of minute hand in a clock once in every 60 minutes, hour hand in a clock once in every 12 hours, position of planets in their orbits around the sun.

The rate of change of distance is called velocity.

The first pendulum clock was invented by Christiaan Huygens in 1656.

The motion of a ball on the ground: The ball is rolling on the ground – rotating as well as moving forward on the ground. Thus, the ball undergoes rectilinear motion as well as rotational motion.

Oscillatory motion: The 'to and fro' motion of a body, e.g. motion of a swing, movement of the 'bob' of a pendulum in a clock etc.

A speedometer or a speed meter is a gauge that measures and displays the instantaneous speed of a vehicle.

The time taken by the pendulum to complete 5 oscillations = 15 s The time taken by the pendulum to complete 1 oscillation = 15/5 = 3 s Therefore, time period = 3 s

Displacement is the shortest distance covered by a moving object from the point of reference in a specified direction.

The direction of motion is constant, but since the speed of body is changing, so it is said to be traveling with the non–uniform velocity.

Uniform or constant acceleration is a type of motion in which the velocity of an object changes by an equal amount in equal time period.

Given speed is 62 km/hr. Speed into m/s = [62 x 1000 m] ÷ [1 x 60 x 60 s] = 17 m/s

Velocity is a vector quantity that includes both speed and direction.

Motion along a curved line is known as CURVILINEAR MOTION.

If bodies are not moving and their momenta is zero