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A block of mass 5 kg is pulled on a horizontal surface with a force of 20 N. If

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Question: A block of mass 5 kg is pulled on a horizontal surface with a force of 20 N. If the frictional force is 5 N, what is the acceleration of the block? (2020)

Options:

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

Correct Answer: 3 m/s²

Exam Year: 2020

Solution: 

Net force = Applied force - Frictional force = 20 N - 5 N = 15 N. Using F = ma, a = F/m = 15 N / 5 kg = 3 m/s².

A block of mass 5 kg is pulled on a horizontal surface with a force of 20 N. If

Practice Questions

Q1
A block of mass 5 kg is pulled on a horizontal surface with a force of 20 N. If the frictional force is 5 N, what is the acceleration of the block? (2020)
  1. 2 m/s²
  2. 3 m/s²
  3. 4 m/s²
  4. 5 m/s²

Questions & Step-by-Step Solutions

A block of mass 5 kg is pulled on a horizontal surface with a force of 20 N. If the frictional force is 5 N, what is the acceleration of the block? (2020)
  • Step 1: Identify the mass of the block, which is 5 kg.
  • Step 2: Identify the applied force, which is 20 N.
  • Step 3: Identify the frictional force, which is 5 N.
  • Step 4: Calculate the net force acting on the block by subtracting the frictional force from the applied force: Net force = 20 N - 5 N.
  • Step 5: Perform the subtraction: 20 N - 5 N = 15 N. So, the net force is 15 N.
  • Step 6: Use the formula F = ma to find the acceleration, where F is the net force, m is the mass, and a is the acceleration.
  • Step 7: Rearrange the formula to solve for acceleration: a = F/m.
  • Step 8: Substitute the values into the formula: a = 15 N / 5 kg.
  • Step 9: Perform the division: 15 N / 5 kg = 3 m/s².
  • Step 10: Conclude that the acceleration of the block is 3 m/s².
  • Newton's Second Law of Motion – This law states that the acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass.
  • Frictional Force – Understanding how friction opposes motion and affects the net force acting on an object.
  • Net Force Calculation – The process of determining the net force by subtracting frictional force from the applied force.
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