common questions tested in wa1

Question 1

Would you rather be steeped on by a person of 500N wearing sports shoes or high heel shoes?

Answer 1

I would rather be stepped by a person wearing sports shoes. The surface area of the shoe is larger compared to the high heels shoe. When the surface area increases, and the force remains the same, the amount of pressure increases.

Question 2

How are aeroplanes designed so as to reduce the amount of friction?

Answer 2

Aeroplanes have a streamline body shape which reduces the surface area in contact with the air. Therefore, friction is reduced.

Question 3

How can friction be reduced?

Answer 3

Friction can be reduced with ball bearings, lubricant and levitation