Question

Question 6. The following figure shows the force and area applied to the board. What is your conclusion about this? 2​

Answer 1

Explanation:

Work done = (Shaded area under the graph between x=0 to $$ x = 35 m)

Work done = Area of triangle (0 to 10s)+Area of rectangle (10 to 30s)+Area of trapezium(30 to 35s)

W=(

2

1

×10×10)+(20×10)+(

2

1

×(10+5)×5)

=287.5J

Answer 2

Answer:

The given figure is a demonstration of pressure.

Explanation:

i) The given figure shows the effect of distribution of mass and difference in pressure.

ii) Pressure is defined as,

Pressure = Force/Contact area

iii) When the books are spread over the entire board, the contact area is much larger, and hence the pressure is lower.

iv) When the books are stacked over each other at one point, the contact area is much smaller, and hence pressure at center is larger.

v) Due to larger pressure, the board flexes at the center.

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