NEET Physics: Static and Kinetic friction Practice Questions
10 free multiple-choice questions on Static and Kinetic friction (Laws of Motion) for NEET Physics, each with the correct answer and a step-by-step explanation. Attempt a question, then reveal the solution to check your reasoning.
Practice thousands more NEET questions in the app →Q1. Friction always acts in the direction:
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Correct answer: D — Opposite to the direction of motion
Friction always opposes the relative motion or the tendency of motion between the interacting surfaces.
Q2. Which condition must be met for the friction force acting between two surfaces to be static friction?
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Correct answer: A — The surfaces must be in contact and there must be no relative motion
Static friction exists when two surfaces are in contact and there is no relative motion between them; it acts to prevent motion.
Q3. Which of the following statements correctly distinguishes static friction from kinetic friction?
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Correct answer: B — Static friction acts to prevent motion, while kinetic friction acts against motion.
Static friction acts as a resisting force when the object is at rest or attempting to move, whereas kinetic friction acts when the object is already in motion.
Q4. The friction force acting on an object is directly proportional to which of the following quantities?
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Correct answer: C — The coefficient of friction and the normal force
The magnitude of friction force is determined by the formula f = μN. Therefore, it is directly proportional to the coefficient of friction (μ) and the normal force (N).
Q5. Static friction is the force that opposes motion when an object is at rest. What is the maximum value of static friction?
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Correct answer: B — μₛ N
The maximum static friction force (f₍s,max)) is calculated as μₛ N, where μₛ is the coefficient of static friction and N is the normal force.
Q6. The force of kinetic friction between two surfaces is always:
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Correct answer: D — Less than the maximum static friction
Kinetic friction (μₖ) is generally less than the maximum static friction (μₛ) required to initiate motion. Therefore, Fₖ < F₍s, max).
Q7. The force of static friction is defined as the force that prevents an object from moving. What is the maximum value of static friction?
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Correct answer: A — It is zero
The maximum value of static friction (fₛᵐᵃˣ) is the threshold force required to initiate motion; once motion starts, the friction becomes kinetic friction.
Q8. When an object is placed on a surface and a horizontal force is applied, the friction force experienced by the object changes once the object starts moving. What is the force that opposes motion once the object is already in motion?
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Correct answer: A — Kinetic friction
Once an object is moving (in motion), the frictional force opposing the motion is called kinetic friction. Static friction is the friction that prevents motion from starting, and its maximum value is the maximum static friction.
Q9. If an object is moving on a surface, which type of friction acts between the object and the surface?
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Correct answer: C — Kinetic friction
When an object is already in motion, the friction acting between it and the surface is defined as kinetic friction.
Q10. Which type of friction is generally greater when an object is at rest on a surface compared to when it is moving across that same surface?
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Correct answer: C — Static friction
Static friction is the force that opposes the start of motion, and it is generally greater than the kinetic friction once motion is already occurring.
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