Question

A block moving to the right on a level surface with friction is pulled by an increasing horizontal force also directed to the right. As the applied force increases, which of the following is true of the normal force and the frictional force on the block? Normal forceFrictional Force a.IncreasesIncreases b.IncreasesRemains Constant c.Remains ConstantIncreases d.Remains ConstantDecreases e.Remains ConstantRemains Constant

Answer 1

Answer:

e) True  Yes both are constant

Explanation:

Let us propose the solution of the problem before reviewing the statements, we use Newton's second law

       F - fr = m a

      N- W = 0

      N = mg

The equation for the force of friction is

     fr = μ N

     F - μ mg = m a

     F = m (a- μ g)

Now let's review the claims

.a) False. Normal force and friction are constants.

.b) False. Both are constant.

.c) False. Both are constant.

d.) False

e) True  Yes both are constant

Answer 2

The applied force increases, the normal force remains constant while the frictional force increases.

The resultant of horizontal force on an object being pulled by a force across the horizontal surface is determined by applying Newton's second law of motion.

$\Sigma F_x = ma$

$F-F_k = ma\\\\F_k = F-ma$

where;

• $F_k$ is the frictional force
• a is the acceleration of the block
• F is the applied force

The normal force on the object being pulled horizontally is given as;

$F_n = mg$

Thus, we can conclude that as the applied force increases, the normal force remains constant while the frictional force increases.

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