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Physics Chapter 5 : Topic 3
Conservative and Non-Conservative Forces
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A force is called conservative if the work done by it:
Reasoning: For conservative forces, work depends only on initial and final positions.
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Which of the following is a conservative force?
Reasoning: Gravity is a conservative force because its work is path independent.
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The work done by a conservative force around a closed path is:
Reasoning: In a closed path, initial and final positions are the same, so net work is zero.
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A conservative force can be associated with:
Reasoning: Conservative forces store energy in the form of potential energy.
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Which statement correctly describes a conservative force?
Reasoning: Conservative forces allow conversion between kinetic and potential energy.
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A particle moves from point $\mathbf{A}$ to point $\mathbf{B}$ through two different paths. For a conservative force:
Reasoning: Path independence is the main property of conservative forces.
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Which force does NOT depend on the path taken?
Reasoning: Gravitational work depends only on height difference.
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The work done against gravity in lifting an object depends on:
Reasoning: Gravity is conservative.
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The work done by friction depends on:
Reasoning: Friction depends on the distance traveled.
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A force whose work depends on the distance traveled is:
Reasoning: Path dependence is a property of non-conservative forces.
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Which pair contains only conservative forces?
Reasoning: Gravitational and electrostatic forces are conservative.
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The force between two electric charges is:
Reasoning: Electrostatic force has associated potential energy.
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Elastic force of an ideal spring is:
Reasoning: Spring force can store and return energy.
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Which force can store energy as potential energy?
Reasoning: Spring deformation stores elastic potential energy.
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The gravitational potential energy of an object is due to:
Reasoning: Gravity is responsible for gravitational potential energy.
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Which of the following is a non-conservative force?
Reasoning: Friction converts mechanical energy into heat.
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Non-conservative forces usually:
Reasoning: Friction changes mechanical energy into thermal energy.
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Air resistance is a non-conservative force because:
Reasoning: Air resistance depends on distance and speed.
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The work done by friction in a closed path is:
Reasoning: Friction always opposes motion and removes energy.
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Mechanical energy is not conserved when:
Reasoning: Non-conservative forces dissipate mechanical energy.
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The main difference between conservative and non-conservative forces is:
Reasoning: Conservative forces are path independent; non-conservative forces are path dependent.
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Which table correctly compares the forces? ForceWorkGravityPath independentFrictionPath dependent This means:
Reasoning: Gravity conserves mechanical energy, while friction dissipates it.
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If only conservative forces act on a system:
Reasoning: Conservative forces conserve total mechanical energy.
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When a ball falls freely under gravity:
Reasoning: Gravity converts potential energy into kinetic energy.
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When a block slides on a rough surface:
Reasoning: Friction is non-conservative.
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A person carries a bag up a staircase. The work done against gravity depends on:
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A person walks around a closed path carrying an object. Work done by gravity is:
Reasoning: Initial and final heights are the same.
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A car moves on a rough road. The energy lost is mainly due to:
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A stretched spring returns to its original shape. This shows that spring force is:
Reasoning: Energy stored in spring can be recovered.
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A satellite orbiting Earth mainly experiences:
Reasoning: Earth’s gravity is conservative.
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If the work done by a force in a closed loop is zero, the force is:
Reasoning: Zero closed-loop work is the condition for conservative forces.
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Which force causes loss of mechanical energy?
Reasoning: Friction changes mechanical energy into heat.
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A conservative force does not depend on:
Reasoning: Path independence defines conservative forces.
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The potential energy function can be defined for:
Reasoning: Potential energy is associated with conservative forces.
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Which statement is correct?
Reasoning: Zero closed-loop work is a defining property.
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A force changes kinetic energy into heat energy. This force is:
Reasoning: Dissipation of mechanical energy occurs due to non-conservative forces.
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