Start learning →

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

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.

Practise Unit 2B: Friction, Gravitational and Normal Forces with Quill →

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

Showing questions 1–30 of 92.

Two resistors 3 Ω and 6 Ω in parallel. Equivalent resistance:Read the answer and worked solution →Specific heat capacity of monatomic ideal gas at constant V:Read the answer and worked solution →Electric field due to infinite plane sheet with surface charge density σ:Read the answer and worked solution →Sound wave intensity I dB scale. 60 dB to 80 dB ratio of intensity:Read the answer and worked solution →Which of the following is a natural source of light?Read the answer and worked solution →An object is placed $10\,\text{cm}$ in front of a converging mirror of radius of curvature $15\,\text{cm}$. What is the magnification of the image?Read the answer and worked solution →For the concave-mirror case where $u=-25\,\text{cm}$, $f=-15\,\text{cm}$, and $h_1=+4\,\text{cm}$, what is the image height $h_2$?Read the answer and worked solution →Two sound waves of nearly equal frequencies interfere. Beats are heard with a beat frequency equal toRead the answer and worked solution →When a mechanical wave passes from one medium to another, which quantity remains unchanged at the boundary?Read the answer and worked solution →The phase speed of a sinusoidal wave is given byRead the answer and worked solution →For a sinusoidal mechanical wave $y=A\sin(\omega t\pm kx)$, the maximum particle speed isRead the answer and worked solution →For a wave described by $y=A\sin(\omega t+kx)$, the direction of propagation isRead the answer and worked solution →A wave is given by $y=A\sin(\omega t-kx)$. This wave travelsRead the answer and worked solution →In a standing wave represented by $y=2A\sin kx\cos\omega t$, the amplitude of a particle at position $x$ isRead the answer and worked solution →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 →

Worked practice questions

Two resistors 3 Ω and 6 Ω in parallel. Equivalent resistance:

  1. 9 Ω
  2. 1.5 Ω
  3. 2 Ω (R_eq = R₁R₂/(R₁+R₂) = 18/9 = 2)
  4. 4.5 Ω
Show answer and solution

Correct answer: C. 2 Ω (R_eq = R₁R₂/(R₁+R₂) = 18/9 = 2)

Parallel: 1/R_eq = 1/3 + 1/6 = 3/6 = 1/2. R_eq = 2 Ω.

Open this question →

Specific heat capacity of monatomic ideal gas at constant V:

  1. (5/2)R
  2. R
  3. 2R
  4. (3/2)R
Show answer and solution

Correct answer: D. (3/2)R

Monatomic: f = 3 DOF, C_v = (f/2)R = (3/2)R. C_p = (5/2)R. γ = 5/3.

Open this question →

Electric field due to infinite plane sheet with surface charge density σ:

  1. σ/(2ε₀) (uniform on both sides)
  2. σ/ε₀
  3. σ/r²
  4. σ × ε₀
Show answer and solution

Correct answer: A. σ/(2ε₀) (uniform on both sides)

**By Gauss law on cylindrical pillbox:** E = σ/(2ε₀) on each side. Field independent of distance. **For conductor surface:** E = σ/ε₀ outside, 0 inside.

Open this question →

How to practise

  1. Choose a Unit 2B: Friction, Gravitational and Normal Forces question and try to work out your answer.
  2. Open the question to check the correct answer and read its worked solution.
  3. Continue in the app for bite-sized lessons, explanations and review with Quill. You can start without creating an account.

Put it into practice

Continue with Unit 2B: Friction, Gravitational and Normal Forces practice for AP Physics 1. Read explanations as you go. No signup form needed to start.

Practise Unit 2B: Friction, Gravitational and Normal Forces →

More Physics topics

Unit 8: Fluids: Density, Buoyancy and ContinuityUnit 1B: Kinematics: 2D Motion & ProjectilesUnit 1C: Kinematics: Relative & Circular MotionUnit 2A: Newton's Laws and Translational EquilibriumUnit 3A: Work and Kinetic Energy TheoremUnit 3B: Potential Energy & Conservation of EnergyUnit 4A: Linear Momentum and ImpulseUnit 4B: Conservation of Linear Momentum & Collisions