Question: A block of mass 2 kg is pushed along a frictionless surface by a constant force of 10 N. What is the work done by the force when the block moves 5 m?
Options:
10 J
20 J
30 J
50 J
Correct Answer: 20 J
Solution:
Work done = Force × Distance = 10 N × 5 m = 50 J.
A block of mass 2 kg is pushed along a frictionless surface by a constant force
Practice Questions
Q1
A block of mass 2 kg is pushed along a frictionless surface by a constant force of 10 N. What is the work done by the force when the block moves 5 m?
10 J
20 J
30 J
50 J
Questions & Step-by-Step Solutions
A block of mass 2 kg is pushed along a frictionless surface by a constant force of 10 N. What is the work done by the force when the block moves 5 m?
Correct Answer: 50 J
Step 1: Identify the force applied to the block, which is 10 N.
Step 2: Identify the distance the block moves, which is 5 m.
Step 3: Use the formula for work done, which is Work = Force × Distance.
Step 4: Substitute the values into the formula: Work = 10 N × 5 m.
Step 5: Calculate the result: 10 N × 5 m = 50 J.
Step 6: Conclude that the work done by the force is 50 Joules.
Work Done – Work done is calculated as the product of the force applied and the distance moved in the direction of the force.
Frictionless Surface – The absence of friction simplifies the calculation of work done, as no energy is lost to friction.
Newton's Second Law – Understanding that a constant force results in constant acceleration, which is relevant for context but not directly needed for this calculation.
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