Question 1: Nam used a force of 100N to push a box of books onto the floor of a truck with a board 2m long. If using another board 4m long, what is the minimum force needed to lift?

– Because the 4m plank is twice as long as the 2m plank, so Nam only needs to use a force equal to half of the original lifting force to push the bookcase onto the floor of the car.

The minimum force required is: \(F = 100: 2 = 50 (N)\)

===============

## Leave a Reply