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Home » Physics » First Year » Chapter Three - Motion and Force » Page 2

Chapter Three – Motion and Force

Our universe is in continuous motion,as atoms in every piece of matter are always in motion.so motion is very important to study.
The change of position from one place to another is known as displacement.It is the shortest distance between two points.
The rate of change of displacement is known as velocity.At any particular instant of time,velocity is called instantaneous velocity.
The Rate of change of velocity is called acceleration.At any instant(small interval of time where time approaches to zero) acceleration is instantaneous acceleration.
In the velocity-time graph,slope gives acceleration at any instant.And the area under the velocity-time graph is equal to total distance covered.
Product of mass and velocity is called momentum.Impulse is the product of force and time,and it is equal to the change in momentum.
A collision in which kinetic energy is conserved,is called elastic collision where in inelastic collision kinetic energy doesn’t remain constant.
Two dimensional motion,under the action of gravity is known as projectile motion.

  • Q 3.11: A ball is thrown horizontal from a height of 10m with velocity of 21m/s. How far off will it hit the ground and with what velocity?

  • Q 3.12: A bomber dropped a bomb at a height of 490m when its velocity along the horizontal was 300 km/h. (a)How long was it in air? (b) At what distance from the point vertically below the bomber at the instant the bomb was dropped, did it strike the ground?

  • Q 3.13: Find the angle of projection of a projectile for which its maximum height and horizontal range are equal.

  • Q 3.14: Prove that for angle of projection, which exceed or fall short of 45 degree by equal amount the ranges are equal.

  • Q 3.15: A SLBM (submarine launched ballistic missile) is fired from a distance of 3000km. If the earth were flat and the angle of launch is 45 degree with horizontal, find the velocity with which the missile is fired and the time taken by SLBM to hit the target

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