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NEET UG Unit 2B: Friction, Gravitational and Normal Forces — practice questions

Explore 78 free Unit 2B: Friction, Gravitational and Normal Forces questions in NEET UG Physics. Open each question or exercise to read its content, reference answers and available explanation.

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Unit 2B: Friction, Gravitational and Normal Forces questions and exercises with answers

Showing questions 1–30 of 78.

A passenger standing in a bus is thrown backward when the bus suddenly starts moving forward. This is best explained by:Read the answer and worked solution →One newton is defined as the force that gives a mass of 1 kg an acceleration of:Read the answer and worked solution →The linear momentum of a body is defined as the product of its:Read the answer and worked solution →The impulse of a force has the same dimensions as:Read the answer and worked solution →The action and reaction forces of Newton's third law:Read the answer and worked solution →For a given pair of surfaces, the coefficient of kinetic friction is usually:Read the answer and worked solution →A constant force of 20 N acts on a 5 kg body initially at rest. Its speed after 3 s is:Read the answer and worked solution →A 0.15 kg ball moving at 12 m s⁻¹ is hit straight back along its path with the same speed. The magnitude of the impulse on the ball is:Read the answer and worked solution →A 0.04 kg bullet moving at 90 m s⁻¹ is stopped after penetrating 0.6 m into a block. The average resistive force is:Read the answer and worked solution →A block just begins to slide down an incline when the angle of inclination is 30°. The coefficient of static friction between block and incline is:Read the answer and worked solution →A 0.02 kg bullet is fired with a speed of 300 m s⁻¹ from a 4 kg gun. The recoil speed of the gun is:Read the answer and worked solution →A 50 kg person stands on a weighing scale inside a lift accelerating upward at 2 m s⁻² (g = 10 m s⁻²). The scale reads:Read the answer and worked solution →A 0.5 kg stone tied to a string is whirled in a horizontal circle of radius 2 m at a speed of 4 m s⁻¹. The tension in the string is:Read the answer and worked solution →The maximum speed at which a car can round an unbanked circular turn of radius 150 m without skidding is (μs = 0.6, g = 10 m s⁻²):Read the answer and worked solution →For a 3 kg block connected over a frictionless pulley to a 20 kg trolley (μk = 0.04, g = 10 m s⁻²), the tension in the connecting string is:Read the answer and worked solution →A net force F = 6t newton (t in seconds) acts on a 2 kg body initially at rest. The speed of the body at t = 4 s is:Read the answer and worked solution →A block slides down a rough incline of 30° with coefficient of kinetic friction 0.2 (g = 10 m s⁻²). Its acceleration down the incline is:Read the answer and worked solution →A lift descends with a downward acceleration equal to g. The apparent weight of a passenger standing inside is:Read the answer and worked solution →A 0.2 kg ball strikes the floor vertically at 10 m s⁻¹ and rebounds at 8 m s⁻¹. The magnitude of the impulse imparted by the floor on the ball is:Read the answer and worked solution →The optimum (design) speed for a car on a frictionless road banked at 45° along a curve of radius 100 m is (g = 10 m s⁻²):Read the answer and worked solution →In the standing wave $y=2A\sin\omega t\cos kx$, antinodes occur where the amplitude isRead the answer and worked solution →In the standing wave $y=2A\sin\omega t\cos kx$, nodes occur whereRead the answer and worked solution →If $y_1=A\sin(\omega t-kx)$ and $y_2=A\sin(\omega t+kx)$ are superposed, the resultant displacement isRead the answer and worked solution →Two waves of the same amplitude and frequency travel in opposite directions along the same line and superpose. What is formed?Read the answer and worked solution →A wave is represented by $y=A\sin(\omega t+kx)$. What does this imply?Read the answer and worked solution →As per your syllabus, Table 1.1, the SI system has how many BASE quantities and units?Read the answer and worked solution →As per your syllabus, the SI unit of LUMINOUS INTENSITY is which?Read the answer and worked solution →As per your syllabus, the SI unit of AMOUNT OF SUBSTANCE is the mole, and one mole contains exactly how many entities?Read the answer and worked solution →As per your syllabus, the second is defined via the caesium-133 hyperfine transition frequency Δν_Cs, fixed at which value?Read the answer and worked solution →As per your syllabus, the metre is defined so that the speed of light in vacuum equals which value?Read the answer and worked solution →

Worked practice questions

A passenger standing in a bus is thrown backward when the bus suddenly starts moving forward. This is best explained by:

  1. inertia of rest
  2. Newton's third law
  3. conservation of momentum
  4. inertia of motion
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Correct answer: A. inertia of rest

When the bus accelerates forward, the feet move with the floor but the upper body stays at rest due to inertia of rest so the passenger is thrown backward.

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One newton is defined as the force that gives a mass of 1 kg an acceleration of:

  1. 9.8 m s⁻²
  2. 1 km s⁻²
  3. 1 cm s⁻²
  4. 1 m s⁻²
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Correct answer: D. 1 m s⁻²

By F = ma, 1 N = 1 kg × 1 m s⁻².

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The linear momentum of a body is defined as the product of its:

  1. mass and acceleration
  2. mass and velocity
  3. mass and displacement
  4. force and time
Show answer and solution

Correct answer: B. mass and velocity

Linear momentum p = mv — the product of mass and velocity; it is a vector quantity.

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