Explanation

• Lever, pulley, wedge, wheel, inclined plane, and screw are examples of simple machines.
• These are basic machines that change the direction or magnitude of a force, making it easier to lift, move, or apply force to an object.

There are six types of simple machines:

1. Inclined Plane
2. Lever
3. Wheel and Axle
4. Pulley
5. Wedge
6. Screw

Explanation

In the Fahrenheit scale:

• The freezing point of water is 32°F
• The boiling point of water is 212°F

Explanation

• Filtration is the process of separating an insoluble solid from a liquid by passing the mixture through a filter paper or a porous material.
• The solid particles are retained by the filter.
• While the liquid passes through, resulting in a clear separation of the two.

Explanation

• Decantation is the process of carefully pouring a liquid from one container to another, leaving the solid particles that have settled at the bottom of the original container behind.
• This process is used to separate a liquid from a solid, without disturbing the solid.

Explanation

• Solids like sand remain suspended in water because they are denser than water.
• But not dense enough to sink to the bottom immediately.
• This creates a heterogeneous mixture, where the sand particles remain suspended in the water.

Explanation

• A food chain is a series of organisms that eat and are eaten by each other, showing the flow of energy and nutrients from one organism to another.
• It represents the relationship of eating and being eaten among organisms in an ecosystem.

Explanation

In mammals, approximately 70% of their body weight is made up of water.

This water is distributed throughout the body and is found in various tissues and organs, including:

• Blood (83% water)
• Muscles (75% water)
• Brain (75% water)
• Bones (25% water)
• Skin (60% water)

Explanation

The life cycle of a frog:

• Frogspawn (Eggs): Laid by the female frog in water.
• Tadpoles (Larvae): Hatch from eggs, aquatic, and feed on algae.
• Froglet (Young Frog): Undergo metamorphosis, develop limbs, and lose tail.
• Frog (Adult): Fully developed, breathing air, and reproducing.

Explanation

• The pupal stage of a butterfly is known as a Chrysalis.
• This stage is characterized by a resting, non-feeding state.
• Where the caterpillar undergoes a dramatic transformation, called metamorphosis, to become an adult butterfly.

Explanation

• Derived quantities are quantities that can be expressed in terms of fundamental quantities through multiplication, division, or raising to a power.
• Examples of derived quantities include area, volume, velocity, acceleration, force, and energy.
• These quantities are derived from the fundamental quantities and are not independent.