As the weight of the block increases the force needed to start it moving (n) increases because there is more friction between the block and the surface is on.

explain why and in detail.

(this is very important is for my sat)

Suppose that a horizontal force F is applied to a block resting on a rough surface (see Figure 6.1). As long as the applied force F is less than a certain maximum force (Fmax), the block will not move. This means that the net force on the block in the horizontal direction is zero. Therefore, besides the applied force F, there must be a second force f acting on the block. The force f must have a strength equal to F, and it must be pointing in the opposite direction. This force f is called the friction force, and because the block does not move, we are dealing with static friction. Experiments have shown that the force of static friction is largely independent of the area of contact and proportional to the normal force N acting between the block and the surface. The static friction force is

f <= us N

hypothesising or postulating

distance = 150m

displ = root (50 ^2 + 100^2)

root(2500+10000)

root 125000