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A 3 kg block is on a table and a horizontal force of 15 N is applied. If the fri

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Question: A 3 kg block is on a table and a horizontal force of 15 N is applied. If the frictional force is 5 N, what is the acceleration of the block?

Options:

  1. 2 m/s²
  2. 3 m/s²
  3. 5 m/s²
  4. 10 m/s²

Correct Answer: 2 m/s²

Solution: 

Net force = applied force - friction = 15 N - 5 N = 10 N. Acceleration a = F/m = 10 N / 3 kg = 3.33 m/s².

A 3 kg block is on a table and a horizontal force of 15 N is applied. If the fri

Practice Questions

Q1
A 3 kg block is on a table and a horizontal force of 15 N is applied. If the frictional force is 5 N, what is the acceleration of the block?
  1. 2 m/s²
  2. 3 m/s²
  3. 5 m/s²
  4. 10 m/s²

Questions & Step-by-Step Solutions

A 3 kg block is on a table and a horizontal force of 15 N is applied. If the frictional force is 5 N, what is the acceleration of the block?
Correct Answer: 3.33 m/s²
  • Step 1: Identify the mass of the block, which is 3 kg.
  • Step 2: Identify the applied force, which is 15 N.
  • Step 3: Identify the frictional force, which is 5 N.
  • Step 4: Calculate the net force by subtracting the frictional force from the applied force: Net force = 15 N - 5 N.
  • Step 5: Perform the subtraction: 15 N - 5 N = 10 N.
  • Step 6: Use the formula for acceleration, which is a = F/m, where F is the net force and m is the mass.
  • Step 7: Substitute the values into the formula: a = 10 N / 3 kg.
  • Step 8: Perform the division: 10 N / 3 kg = 3.33 m/s².
  • Newton's Second Law – The relationship between force, mass, and acceleration, expressed as F = ma.
  • Net Force Calculation – Understanding how to calculate the net force acting on an object by subtracting friction from the applied force.
  • Frictional Force – Recognizing the role of friction in opposing motion and how it affects the net force.
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