PHY101 Assignment No. 1 solution

Assignment 1: (Fall 2011) Physics

PHYSICS (PHY101)

TOTAL MARKS: 20

Due Date: 31/10/2011

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Question # 1

A hand holding the apple lifts it upwards, applying a force of 10N. If the mass of the apple is 250g has a weight of 2.5N. Find the acceleration of the apple. Marks = 5

Q: 2:

A frog applies a constant force of 80N while pushing him up a hill, while gravity and legs friction cause a constant 80N force in the opposite direction. In this situation 

a. the frog applied force of 80N means the frog must be accelerating

b. the net force on the frog is 0N, which means the frog is not accelerating

c. the combined force of gravity and legs friction means the frog must be decelerating

d. the frog can't be moving up the hill, because the forces on it are balanced.

Write the detail of your above choice as well. vusolutions Marks = 5

Q. 3:

If a motorcyclist is moving at 70 km/h and it rounds a corner, also at 70 km/h, does it maintain a constant speed, or a constant velocity? Explain your answer. Marks = 5

Question # 4

A Pakistani satellite moves in a straight line towards the north with a speed of 3 × 104m/s.It has subjected to different frictional forces (like air frication, gravity etc) acting on it. During a 5m displacement, vusolutions the total work done on the satellite is 

(I) zero

(II) positive

(III) negative

(IV) insufficient information provided in question.

Justify your above selected choice as well. Marks = 5

Solution: