Question

What is the magnitude of the kinetic frictional force of 438N, 25N, 125N, 500N?

A) 438N
B) 25N
C) 125N
D) 500N

Answer 1

In this case, the magnitude of the kinetic frictional force is 25 N.

So, the correct answer is B)25 N.

Step-by-step explanation:

The free body diagram shows the forces acting on the box:

• 1. The applied force pulling the box to the right.
• 2. The weight of the box acting downward.
• 3. The normal force exerted by the surface upward.
• 4. The kinetic frictional force opposing the motion.

Since the box is being pulled to the right, the applied force and the kinetic frictional force are in opposite directions.

When an object is moving at a constant velocity, the net force acting on it is zero. In this case, the applied force is balanced by the kinetic frictional force.

Therefore, the magnitude of the applied force must be equal to the magnitude of the kinetic frictional force.

From the options provided, the magnitude of the kinetic frictional force is 25 N, which matches option b.

So, the correct answer is B)25 N.

Your question is incomplete, but most probably the full question was:

A box is being pulled to the right. The free body diagram is shown

What is the magnitude of the kinetic frictional force?

options:

a. 375 N

b. 25N

c. 125 N

d. 500 N

Answer 2

The kinetic frictional force with the highest magnitude is 500N, (D).

What does kinetic force depend on?

The magnitude of the kinetic frictional force depends on the normal force and the coefficient of kinetic friction (
`\(f_k = \mu_k \cdot N\)`). In this case, the kinetic frictional force is given for each force separately. Therefore, each force has its own frictional force magnitude.

If we assume that each force is acting on the same object and the normal force is the same for all, we can compare the given forces directly:

The kinetic frictional force with the highest magnitude is 500N (Option D), so the correct answer is D) 500N.