Advertisements
Advertisements
Question
Explain why, the tip of a sewing needle is sharp.
Advertisements
Solution
The tip of a sewing needle is sharp because the area under the pointed end of the sharp needle is very small. Pressure exerted by a sharp needle is more on the cloth and can pierce easily through the cloth.
APPEARS IN
RELATED QUESTIONS
A ball is thrown vertically upwards with a velocity of 49 m/s. Calculate
- the maximum height to which it rises.
- the total time it takes to return to the surface of the earth.
During a free fall, will heavier objects accelerate more than lighter ones ?
Give reason for the following :
The force of gravitation between two cricket balls is extremely small but that between a cricket ball and the earth is extremely large.
Why does a sharp knife cut objects more effectively than a blunt knife ?
Name the force which pulled the apple off Isaac Newton’s tree.
i) If g = GM/r2 then where will the value of g be high at Goa Beach or on top of Mount Everest?
For freely falling object we can write the Newton’s second equation of motion as …..
How is the acccelaration due to gravity on the surface of the earth realted to its mass and radius ?
An object falling freely from rest reaches ground in 2 s. If acceleration due to gravity is 9.8 m s-2, then the velocity of object on reaching the ground will be
Free fall of an object does not depend on the mass of the object.
