PHY101 Assignment # 1 Solution Fall 2012

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Question # 1

A football player kicks a football straight up in to the air with an initial velocity of 25m/s. What is the approximate maximum height that the ball reaches? Use acceleration due to gravity (g) as 9.8m/s².          Marks = 7

Question # 2

In the classic horse and cart problem, a horse is attached to a cart that can roll along on a set of wheels. Which of the following statement is true? Also explain the reason of your selected choice as well.

 a)      The horse pulls on the cart with a force, and the cart pulls, back on the horse with an equal force.

b)      The horse pulls on the cart with a force greater than the force that the cart pulls back on the horse.


c)      The horse pulls the cart forward because the force of friction forward is greater than the force of the wagon backward.

d)      The horse pulls the cart forward, because of a time delay between the action and reaction forces.

e)      The horse pulls the cart forward, but only if the horse has a mass greater than the mass of

the cart.                                                                                                    Marks = 6 (2+4)

Question # 3

Is it true to say that a projectile has zero acceleration at its peak? If yes explain if not give a reason. Marks = 4

Question # 4

(a)Anna is pushing but the box does not move. What is the force of static friction shown in below figure? Marks = 3

(b) What is the maximum static friction force shown in below figure? The coefficient of static friction for these materials is 0.31. Marks = 5

 <<<<<<<<<<<<<<<Wish you good luck>>>>>>>>>>>>