Physics

• Who is the presenter of the full GCSE physics revision video?

  Sanal D
• What is the main focus of the video?

  Full GCSE physics revision
• How many years of teaching experience does the presenter have?

  Over 10 years
• What should viewers do if they don't understand something in the video?

  Comment below for clarification
• What are the main concepts covered in the video?

  • Energy concept
  • Electricity concept
  • Particle model of matter
  • Radioactivity
  • Forces
  • Waves
  • Magnetism
  • Space physics
• How should viewers use the video for effective revision?

  Watch, pause, and take notes
• What is the unit of measurement for energy?

  Joules (J)
• What does it mean for energy in a closed system?

  Total energy remains constant
• What are the eight types of energy stores?

  1. Magnetic
  2. Internal
  3. Chemical
  4. Kinetic
  5. Electrostatic
  6. Elastic potential
  7. Gravitational potential
  8. Nuclear
• What happens to the energy of a ball as it falls?

  Gravitational energy converts to kinetic energy
• What is the formula for kinetic energy?

  $E =$$\frac{1}{2} m v^2$
• What happens to kinetic energy if mass is doubled while velocity remains constant?

  Kinetic energy doubles
• What happens to kinetic energy if velocity is doubled while mass remains constant?

  Kinetic energy quadruples
• What is the formula for elastic potential energy?

  $E =$$\frac{1}{2} K e^2$
• What does the spring constant measure?

  How stiff the spring is
• What is the formula for gravitational potential energy?

  $E =$$m g \Delta h$
• What is specific heat capacity?

  Energy needed to raise 1 kg by 1°C
• What is the specific heat capacity of water?

  4,200 J/kg°C
• What does a higher specific heat capacity indicate?

  More energy is required to change temperature
• What is the formula for calculating energy transferred using specific heat capacity?

  $E =$$m c \Delta \theta$
• How do you calculate energy transferred for water heated from 5°C to 45°C?

  $E =$$0.1 \times 4200 \times 40 =$$16800 J$
• What is the method to determine specific heat capacity of an aluminum block?

  1. Set up apparatus with heater and thermometer.
  2. Record voltage and current every 60 seconds.
  3. Use formula $E =$$I \times T \times V$ to calculate energy.
  4. Plot graph of temperature vs. energy.
  5. Rearrange formula to find specific heat capacity.
• What is the unit of power?

  Watts (W)
• What is the formula for power?

  $P =$$\frac{E}{T}$
• If a hair dryer transfers 1,000 J in 20 seconds, what is its power?

  50 W
• How is energy efficiency calculated?

  Useful energy out / total energy in × 100
• What is the efficiency of a light bulb with 100 J in and 80 J out?

  80%
• What is thermal conductivity?

  • Measure of heat transfer through a material
  • Higher thermal conductivity means more heat flow
• Which material has the highest thermal conductivity?

  Glass
• What is the purpose of the practical investigating thermal insulators?

  To see which material loses heat fastest
• What should be controlled in the thermal insulator experiment?

  Same surface area and water amount
• Why is it important to keep the surroundings' temperature constant in the experiment?

  To ensure a fair test
• What safety precautions should be taken during the experiment?

  Use gloves when handling hot water
• What happens to the temperature when thermometers are placed in hot water?

  The temperature will go up
• What should you do after starting the stopwatch in the experiment?

  Record the temperature on each thermometer
• What is the effect of insulation on temperature change in water?

  Different insulation types cause different temperature changes
• What safety equipment should be used when handling hot water?

  Gloves
• Why is it important to use cans of the same surface area in the experiment?

  To ensure a fair test
• What should be kept constant to ensure a fair test regarding the surroundings?

  The temperature of the surroundings
• Why must the thickness of each insulator be the same?

  To ensure a fair comparison