HSA Physical Science 3

Question 1

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

Accepted Answer

They will repel each other

Answer

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

Question 2

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

Accepted Answer

20 J

Answer

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

Question 3

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

Accepted Answer

A light bulb glowing

Answer

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

Question 4

At what temperature does water boil at standard atmospheric pressure?

Accepted Answer

100°C

Answer

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

Question 5

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

Accepted Answer

Spreading the work over a longer distance

Answer

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.

HSA - Hawaii State Assessment Practice Test