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AP Physics 1 Unit 2B: Friction, Gravitational and Normal Forces — practice questions — page 2

Explore 92 free Unit 2B: Friction, Gravitational and Normal Forces questions in AP Physics 1 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 31–60 of 92.

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 →As per your syllabus, the kilogram is now defined via which fundamental constant?Read the answer and worked solution →As per your syllabus, the kelvin is defined by fixing which constant?Read the answer and worked solution →As per your syllabus, the unit of PLANE ANGLE in SI is which?Read the answer and worked solution →As per your syllabus, the unit of SOLID ANGLE in SI is which?Read the answer and worked solution →As per your syllabus, the SI unit of ELECTRIC CURRENT is the ampere, defined via the elementary charge fixed at which value?Read the answer and worked solution →As per your syllabus, 1 LITRE equals which SI volume?Read the answer and worked solution →As per your syllabus, 1 STANDARD ATMOSPHERIC PRESSURE (atm) equals approximately which value?Read the answer and worked solution →As per your syllabus, rule, ALL non-zero digits in a measurement are which?Read the answer and worked solution →As per your syllabus, the number of significant figures in 2.308 cm is which?Read the answer and worked solution →As per your syllabus, rule, in a number less than 1, the zeros LEFT of the first non-zero digit are which?Read the answer and worked solution →As per your syllabus, the number of significant figures in 0.007 m² is which?Read the answer and worked solution →As per your syllabus, in a number WITH a decimal point, TRAILING zeros are which?Read the answer and worked solution →As per your syllabus, the number of significant figures in 6.320 J is which?Read the answer and worked solution →As per your syllabus, the number 4 700 m written WITHOUT a decimal has how many significant figures?Read the answer and worked solution →As per your syllabus, in the form a × 10ᵇ all zeros appearing in the base number a are which?Read the answer and worked solution →As per your syllabus, the diameter of Earth ≈ 1.28 × 10⁷ m has order of magnitude equal to which value?Read the answer and worked solution →

Worked practice questions

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:

  1. 3.3 m s⁻²
  2. 1.7 m s⁻²
  3. 5.0 m s⁻²
  4. 2.7 m s⁻²
Show answer and solution

Correct answer: A. 3.3 m s⁻²

Down the incline a = g(sinθ − μk cosθ) = 10(0.5 − 0.2×0.866) = 10(0.5 − 0.173) = 3.3 m s⁻². The value 5.0 wrongly ignores friction.

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A lift descends with a downward acceleration equal to g. The apparent weight of a passenger standing inside is:

  1. zero
  2. twice mg
  3. equal to mg
  4. half of mg
Show answer and solution

Correct answer: A. zero

Apparent weight N = m(g − a). With downward acceleration a = g, N = 0 — the passenger is in free fall and feels weightless.

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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:

  1. 3.6 N s
  2. 2.0 N s
  3. 1.6 N s
  4. 0.4 N s
Show answer and solution

Correct answer: A. 3.6 N s

Taking upward as positive, impulse = m(v_up − v_down) = 0.2[8 − (−10)] = 0.2×18 = 3.6 N s.

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More Physics topics

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