Question

Explain the meanings of
$\left(i\right)$ rectilinear motion, and
$\left(ii\right)$ curvilinear motion.
Give one example.

Answer 1

$\left(i\right)$If the motion of a body is along a straight line, it is known as rectilinear motion. Rectilinear motion is also called linear motion.
An apple falling from height falling on earth and a car moving in a straight path are examples of rectilinear motion.

$\left(ii\right)$If the motion of a body is along a curved path, it is known as curvilinear motion. The direction of motion is constantly changing in this motion.
The cyclist taking a turn and the path of a stone thrown in the sky are examples of curvilinear motion.