All Exams Test series for 1 year @ ₹349 only
Question

If a force acts on a body but no displacement occurs, the work done is:

This question was previously asked in
RRB ALP 2025 CBT 2 Mechanic Motor Vehicle Question Paper (28-Jul-2026) (Shift 1)
The correct answer is

Zero

To determine the work done when a force acts on a body without causing any displacement, we need to understand the concept of work in physics. The work done by a force is mathematically defined as:

\(W = F \cdot d \cdot \cos(\theta)\)

where:

  • \(W\) = work done
  • \(F\) = magnitude of the force applied
  • \(d\) = displacement of the object
  • \(\theta\) = angle between the force and the direction of displacement

In the given scenario, it is mentioned that the force acts on the body but no displacement occurs, which means \(d = 0\). Substituting this into the formula, we get:

\(W = F \cdot 0 \cdot \cos(\theta) = 0\)

This implies that when there is no displacement, no matter the magnitude of the force or the angle, the work done is zero.

Conclusion: The correct option is "Zero" because work done is directly proportional to the displacement, and with zero displacement, the work is zero.

Was this answer helpful?

Similar Questions

  1. When a moving car suddenly applies brakes, its kinetic energy is transformed mainly into which form of energy?

  2. Two students move identical boxes through a distance of 10 m. Student A applies a force of 50 N, while Student B applies a force of 100 N. What is the difference in the work done by the two students?

  3. Which of the following best defines 'work' in physics?

  4. A car of mass 1200 kg accelerates from rest to a speed of 20 m/s on a straight road. If the kinetic energy gained by the car is completely due to the work done by the engine, which of the following best represents the total kinetic energy acquired by the car at this speed?

  5. Which of the following scenarios best demonstrates the conversion of chemical energy to mechanical energy?

  6. A roller coaster at the top of its track has maximum potential energy. As it descends and speeds up, what principle explains why the sum of its kinetic and potential energies remains constant if we ignore friction and air resistance?
  7. A force of 10 newtons moves an object 2 metres. How much work is done?

  8. If two vehicles have the same motor but one carries more passengers, which will need higher tractive effort on the same road?

  9. A technician lifts a box using a hoist. What type of energy is primarily involved in lifting?

  10. Which statement best describes how the mass and speed of an object affect its kinetic energy?


Important Questions from Work Power and Energy

  1. Which is the main source of almost all energy on Earth?

  2. Area under constant velocity – time curve equals ________ of the object over a given time interval.

  3. If a body of mass is m, linear momentum is p and kinetic energy is K, then which of the following expressions is true?

  4. Work done by conservative force is equal to

  5. A rain drop of mass $2 \text{ g}$ falls from a height of $1.5 \text{ km}$. It starts with an initial downward velocity of $20 \text{ m/s}$ and hits the ground with a speed of $70 \text{ m/s}$. Take the acceleration due to gravity $g$ as $10 \text{ m/s}^2$. The work done by the (i) gravitational force and the (ii) resistive force of air is

Need Expert Advice?
Upcoming Exams
RRB NTPC
September 27, 2026
Test Series
RRB ALP img
Railways
RRB ALP 2026 Mock Test series
1035 Tests 1 Tests Free
856 Attempts
4.3(235)
English, Hindi
More Questions from RRB ALP

Start Your Preparation with Prepp Mobile App

Download the app from Google Play & App Store
Download the app from Google Play & App Store
Prepp Mobile App