Physical Science Flashcards

Two magnets are brought near each other with their north poles facing. What will happen?

Answer: They will repel each other

Like magnetic poles repel each other; two north poles facing will push away from one another.

A 10 kg object is moving at 2 m/s. What is its kinetic energy? (KE = ½mv²)

Answer: 20 J

KE = ½ × 10 kg × (2 m/s)² = ½ × 10 × 4 = 20 Joules.

Which of the following is an example of converting electrical energy into light energy?

Answer: A light bulb glowing

A light bulb converts electrical energy into light energy (and some heat), making it a direct example of this energy transformation.

At what temperature does water boil at standard atmospheric pressure?

Answer: 100°C

Water boils at 100°C (which is also 212°F) at standard atmospheric pressure (1 atm or 101.325 kPa).

An inclined plane reduces the effort needed to move an object by:

Answer: Spreading the work over a longer distance

An inclined plane allows a smaller force to be applied over a longer distance to achieve the same amount of work as lifting an object straight up.

Which of the following is NOT a property used to identify a pure substance?

Answer: Mass

Mass is an extensive property that depends on the amount of substance present, while melting point, boiling point, and density are intensive properties that can identify a pure substance.

Which type of wave requires NO medium to travel through?

Answer: Electromagnetic waves

Electromagnetic waves (like light, radio waves, and X-rays) do not require a medium and can travel through the vacuum of space.