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A box is pushed across a floor with a force of 50 N. If the coefficient of kinet

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Question: A box is pushed across a floor with a force of 50 N. If the coefficient of kinetic friction is 0.4, what is the net force acting on the box if the normal force is 100 N?

Options:

  1. 10 N
  2. 20 N
  3. 30 N
  4. 40 N

Correct Answer: 30 N

Solution: 

Frictional force = μk * N = 0.4 * 100 N = 40 N. Net force = applied force - frictional force = 50 N - 40 N = 10 N.

A box is pushed across a floor with a force of 50 N. If the coefficient of kinet

Practice Questions

Q1
A box is pushed across a floor with a force of 50 N. If the coefficient of kinetic friction is 0.4, what is the net force acting on the box if the normal force is 100 N?
  1. 10 N
  2. 20 N
  3. 30 N
  4. 40 N

Questions & Step-by-Step Solutions

A box is pushed across a floor with a force of 50 N. If the coefficient of kinetic friction is 0.4, what is the net force acting on the box if the normal force is 100 N?
Correct Answer: 10 N
  • Step 1: Identify the applied force on the box, which is given as 50 N.
  • Step 2: Identify the coefficient of kinetic friction, which is given as 0.4.
  • Step 3: Identify the normal force acting on the box, which is given as 100 N.
  • Step 4: Calculate the frictional force using the formula: Frictional force = μk * N.
  • Step 5: Substitute the values into the formula: Frictional force = 0.4 * 100 N.
  • Step 6: Calculate the frictional force: Frictional force = 40 N.
  • Step 7: Calculate the net force acting on the box using the formula: Net force = applied force - frictional force.
  • Step 8: Substitute the values into the formula: Net force = 50 N - 40 N.
  • Step 9: Calculate the net force: Net force = 10 N.
  • Friction – Understanding how frictional force opposes motion and is calculated using the coefficient of kinetic friction and the normal force.
  • Net Force – Calculating the net force by subtracting the frictional force from the applied force.
  • Normal Force – Recognizing the role of the normal force in determining the frictional force acting on an object.
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