Explanation

• Translucent objects allow some light to pass through them.
• But also scatter or absorb some of the light, resulting in faint or diffuse shadows.

Explanation

• Transparent objects do not form shadows because they allow all light to pass through them.
• So there is no blocking of light to create a shadow.

Explanation

• Opaque objects do not allow any light to travel through them, as they absorb or reflect all of the light.
• Examples: Metals, wood, stone, paper, books, table, wall, newspaper, brick wall, wooden objects, trees and thick clothing.

Explanation

• Transparent objects allow light to travel through them without scattering or absorbing any of the light.
• Examples: Glass, water, air, plastic and wrap.

Explanation

• Jupiter is a non-luminous object.
• Unlike burning coal, glassware and fireworks, which either emit or reflect light in ways that are noticeable.
• Jupiter does not generate its own light but reflects the light of the Sun.

Explanation

• Non-luminous objects do not emit light of their own, but they can reflect, transmit, or absorb light from other sources.
• Examples: Moon, furniture in the room, books, clothes, trees, planets, paper and most solid objects.

Explanation

• A nail cutter is an example of a Second-class lever.
• Where the load (the nail) is located between the effort (the hand) and the fulcrum (the pivot point of the cutter).

Explanation

According to the positions of effort, fulcrum, and load, levers are divided into three kinds:

1. First kind of lever: The fulcrum is located between the effort and the load. Examples: See-saws, crowbars, hammer claws, scissors, pliers and boat oars.
2. Second kind of lever: The load is located between the effort and the fulcrum. Examples: Bottle opener, wheelbarrow, nut cracker, nail clippers, nail cutter, paper cutter and door.
3. Third kind of lever: The effort is located between the fulcrum and the load. Examples: Broom, tongs, human arm, stapler, fishing rod and tweezers.

Explanation

• Mass is a measure of the amount of matter in an object, and it remains constant regardless of where you are in the universe.
• Your mass on Earth is the same as your mass on the Moon, because you are still made up of the same amount of matter.
• However, your weight (the force exerted on you by gravity) would be different on the Moon, because the Moon has a much weaker gravitational field than Earth.

Explanation

• Gravity is the force that pulls objects towards the Earth.
• Keeping us and everything else on the ground.