Acar is being driven along a country road on a dark and rainy night at a speed of 20 m/s. the section of road is horizontal and straight. the driver sees that a tree has fallen and covered the road ahead. panicking, the driver locks the brakes at a distance of 20 m from the tree. if the coefficient of friction between the wheels and road is 0.8, determine the outcome.

Car collides.

Explanation:

The (negative) acceleration experimented by the car will be given by Newton's 2nd Law , where f is the friction force, which is the only force acting on the car on the horizontal direction. Its value is given by the formula since the normal force and the weight of the car are balanced on the vertical direction. All this gives us the equation

To calculate the distance traveled by the car, we will use the equation for accelerated motion on the form (since it comes to a rest ):

Which for our values is (taking the direction of movement as positive, which makes a negative, so we add a -1 to account for this):

Which means the car crashes against the tree.

the order for strong to weak forces such as

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force

the fundamental forces are those forces that act between to objects or element to make interactions. there are four types of fundamental forces such as strong and weak nuclear forces (due to protons and electrons), electromagnetic force (due to the motion of electrons) and gravitational force (due to orbital movement of the planet). if these forces are arranged on the basis of their maximum strength then the order is

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force

technology is the application of the knowledge gained by science.