This video revises Unit 1 of the IGCSE Physics syllabus for 2023, covering topics like measurements, speed, velocity, acceleration, forces, Newton's laws, momentum, pressure, and energy. It explains the changes in the syllabus, including the removal of certain topics, and provides detailed explanations of key concepts with examples. The video also discusses the importance of understanding units, errors, and the application of physics principles in real-world scenarios.

Which topics have been removed from the IGCSE Physics Unit 1 syllabus for 2023?

• Barometer and manometer

• Newton's Laws of Motion

• Kinetic energy

• Hooke's Law

What is the SI unit for mass?

• Kilogram

• Ounce

• Pound

• Gram

How do you calculate the density of an object?

• Mass times acceleration

• Length times width times height

• Mass divided by volume

• Volume divided by mass

What is the difference between speed and velocity?

• Speed includes direction, velocity does not

• Velocity includes direction, speed does not

• Speed is measured in meters per second squared

• Velocity is always greater than speed

According to Newton's first law, what happens to an object if no external force acts on it?

• It accelerates

• It decelerates

• It changes direction

• It remains at rest or moves at constant speed

What happens to the resultant force on a falling object as air resistance increases?

• It becomes zero.

• It remains constant.

• It decreases.

• It increases.

Which of the following is true about impulse?

• Impulse is the same as acceleration.

• Impulse is the product of mass and velocity.

• Impulse is the change in momentum over time.

• Impulse is the product of force and time.

According to Hooke's Law, what is the relationship between force and extension in a spring?

• Force is independent of extension.

• Force is equal to the square of extension.

• Force is directly proportional to extension.

• Force is inversely proportional to extension.

How is pressure in a liquid determined?

• By the volume of the liquid.

• By the depth and density of the liquid.

• By the color of the liquid.

• By the temperature of the liquid.

Which energy source is not derived from the sun?

• Wind energy

• Solar energy

• Hydroelectric energy

• Geothermal energy