Question

You find it takes 200 N of horizontal force tomove an unloaded pickup truck along a level road at a speed of2.4 m/s. You then load up the pickup and pump up itstires so that its total weight increases by 42% whilethe coefficient of rolling friction decreases by19%.a) Now what horizontal force will you need to move the pickupalong the same road at the same speed? The speed is low enough thatyou can ignore air resistance.

Answer 1

Answer:

The horizontal force that will be needed to move the pickup along the same road at the same speed is 230 N

Explanation:

given information:

horizontal force, F = 200 N

speed, v = 2.4 m/s

total weight increase 42%

coefficient of friction decrease by 19%

now, lets take a look of horizontal system

F - F(friction) = 0

F = F(friction)

F = μ N

F = μ m g

μ m g = 200 N

now find the force to move the pickup along the same road at the same speed(F(move))

total weight increase 42%, m g = 1+0.42 = 1.42

he coefficient of rolling friction decreases by 19%, μ = 1 - 0.19 = 0.81

F (move) = (0.81μ) (1.42 m g)

               = (0.81) (1.42) (μ m g)

                = (0.81) (1.42) (200)

                = 230 N