The pressure exerted by a given force can be decreased by increasing the area of contact. P=F/A The equation shows that pressure is inversely proportional to area. FOUNDATION OF BUILDINGS The foundation off building is made more broader than the rest of the building so that the pressure exerted by the weight on earth can be decreased. SHOULDER STRAPS OF SCHOOL BAGS The shoulder straps of school bags are made wider and soft so that the pressure exerted by the heavy bags on shoulders can be reduced. You can feel…

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## An interesting numerical problem from kinematics

George’s favorite food was bananas. One day he was walking with his friend, the man in the yellow hat, as he was eating a banana. They were in New York City and they were walking up the Empire State Building. Finally they made it to the top! George spied a nice young woman walking down 5th avenue balancing this hat on her head. She was very noticeable for she was six feet tall! George, being the troublemaker he was, wanted to see if he could drop his banana peel in…

Read More## Numerical Problems from Kinematics and Force

1.if a man in a boat rows perpendicular to the bank he is drifted 120 m during crossing river in 10 minutes . if he heads at angle of alpha from upstream he crosses river by shortest path in 12.5 min. find width of river,velocity of river with respect to water,velocity of boat with respect to river 2.a projectile is thrown horizontally from top of building of height 10 m with a certain speed u.at same time another projectile thrown from ground 10 m away from building with equal speed…

Read More## A numerical from Projectile motion, friction and more

Hale asked: One side of the roof of a building slopes up at 33.5°. A roofer kicks a round, flat rock that has been thrown onto the roof by a neighborhood child. The rock slides straight up the incline with an initial speed of 15.0 m/s. The coefficient of kinetic friction between the rock and the roof is 0.430. The rock slides 10.0 m up the roof to its peak. It crosses the ridge and goes into free fall, following a parabolic trajectory above the far side of the roof,…

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