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AP Physics 1 Unit 1A: Kinematics: 1D Motion, Position & Velocity — practice questions — page 3

Explore 87 free Unit 1A: Kinematics: 1D Motion, Position & Velocity 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 1A: Kinematics: 1D Motion, Position & Velocity questions and exercises with answers

Showing questions 61–87 of 87.

The pressure at the **top of a column of water** open to atmosphere is approximately:Read the answer and worked solution →The **excess pressure** inside a spherical liquid drop of radius $r$ and surface tension $T$ is:Read the answer and worked solution →The excess pressure inside a **soap bubble** of radius $r$ and surface tension $T$ is:Read the answer and worked solution →A drop of water of radius 1 mm is broken into 1000 droplets of equal size. The ratio of total surface area after : before equals:Read the answer and worked solution →Maximum acceleration in SHM ($A = $ amplitude, $\omega = $ angular frequency) is:Read the answer and worked solution →In a damped oscillator $\ddot x + 2\gamma\dot x + \omega_0^2 x = 0$, the **amplitude decays** as:Read the answer and worked solution →A particle in SHM has displacement $x = a\cos(\omega t) + b\sin(\omega t)$. The amplitude of motion is:Read the answer and worked solution →A particle performs SHM along x-axis with amplitude $A$ and period $T$. The time taken from $x = 0$ to $x = A/2$ is:Read the answer and worked solution →A particle in SHM has a maximum speed of 30 cm/s and a maximum acceleration of 90 cm/s². The period of oscillation is:Read the answer and worked solution →An SHM is given by $x = 5\sin(4\pi t + \pi/4)$ cm. The displacement at $t = 0.25$ s is:Read the answer and worked solution →Sound is produced by:Read the answer and worked solution →The object that produces sound is called the:Read the answer and worked solution →In humans, sound is produced by the vibration of:Read the answer and worked solution →A tuning fork is usually shaped like the letter:Read the answer and worked solution →Sound needs a material medium to travel; it cannot propagate through:Read the answer and worked solution →Sound waves in air are:Read the answer and worked solution →A region of higher pressure (and density) in a sound wave is called a:Read the answer and worked solution →A region of lower pressure (and density) in a sound wave is called a:Read the answer and worked solution →The distance between two consecutive compressions (or two consecutive rarefactions) is the:Read the answer and worked solution →The number of complete oscillations per second is called the:Read the answer and worked solution →The SI unit of frequency is the:Read the answer and worked solution →The time taken for one complete oscillation is the:Read the answer and worked solution →If the frequency of a wave is f and its wavelength is λ, its speed v is given by:Read the answer and worked solution →The maximum displacement of particles from their mean position is called the:Read the answer and worked solution →The pitch of a sound is determined primarily by its:Read the answer and worked solution →The loudness of a sound is related to its:Read the answer and worked solution →The audible range of frequencies for a normal human ear is approximately:Read the answer and worked solution →

Worked practice questions

The pressure at the **top of a column of water** open to atmosphere is approximately:

  1. $10^5$ Pa (atmospheric pressure)
  2. Zero
  3. $10^7$ Pa
  4. Cannot be determined
Show answer and solution

Correct answer: A. $10^5$ Pa (atmospheric pressure)

Surface of an open water body is at atmospheric pressure $p_0 \approx 1.013 \times 10^5$ Pa. **Pressure increases with depth:** $p = p_0 + h\rho g$.

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The **excess pressure** inside a spherical liquid drop of radius $r$ and surface tension $T$ is:

  1. $T/r$
  2. $2T/r$
  3. $4T/r$
  4. $8T/r$
Show answer and solution

Correct answer: B. $2T/r$

For a single-surface liquid drop, excess pressure = $2T/r$. For a soap bubble (two surfaces — inside and outside), it's $4T/r$. Smaller drops have larger internal pressure — that's why tiny droplets evaporate faster.

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The excess pressure inside a **soap bubble** of radius $r$ and surface tension $T$ is:

  1. $T/r$
  2. $2T/r$
  3. $4T/r$
  4. $8T/r$
Show answer and solution

Correct answer: C. $4T/r$

Soap bubble has TWO air-soap interfaces (inside and outside surface of the film). **So excess pressure doubles:** $\Delta P = 4T/r$. (Liquid drop has one interface ⇒ $2T/r$.)

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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 2B: Friction, Gravitational and Normal ForcesUnit 3A: Work and Kinetic Energy TheoremUnit 3B: Potential Energy & Conservation of EnergyUnit 4A: Linear Momentum and Impulse