# Motion Under Gravity | Definition, Examples, Equation – Motion in a Straight Line

## Motion Under Gravity | Definition, Examples, Equation – Motion in a Straight Line

We are giving a detailed and clear sheet on all Physics Notes that are very useful to understand the Basic Physics Concepts.

Motion Under Gravity Definition:
The motion under gravity refers to the movement of an object whose vertical motion is affected by the presence of gravity.

Motion Under Gravity Equations:
If an object is falling freely (u = 0) under gravity, then equations of motion becomes
(i) v = u + gt
(ii) h = ut + $$\frac{1}{2}$$ gt²
(iii) v² = u² + 2gh

Note:
If an object is thrown upward then g is replaced by – g in above three equations.
It thus follows that:
(i) Time taken to reach maximum height, tA = $$\frac{u}{g}=\sqrt{\frac{2 h}{g}}$$
(ii) Maximum height reached by the body, hmax = $$\frac{u^{2}}{2 g}$$
(iii) A ball is dropped from a building of height h and it reaches after t seconds on earth. From the same building if two ball are thrown (one upwards and other downwards) with the same velocity u and they reach the earth surface after t1 and t2 seconds respectively, then
$$t=\sqrt{t_{1} t_{2}}$$
(iv) When a body is dropped freely from the top of the tower and another body is projected horizontally from the same point, both will reach the ground at the same time.

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Motion in a Straight Line Topics: