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)
2 m/s²
3 m/s²
4 m/s²
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.
