Explanation

• To obtain a sharp image in a camera, the lens is moved back and forth to adjust the focus.
• It allowing the light rays to converge at the image sensor or film, resulting in a clear and sharp image.

Explanation

• Pressure increases when Area of contact is decreased.
• This is because the same force is concentrated on a smaller area, resulting in a higher pressure (P = F/A), similar to how a sharp object can exert more pressure than a blunt object.

Explanation

• A closed circuit provides a complete path for the current to flow through.
• It allowing electricity to flow from the power source, through the wire, and back to the power source.

Explanation

An inclined plane is a slanting surface connecting a lower level to a higher level.

It is a simple machine that helps to lift or move loads to a higher position, and is commonly used in:

• Ramps
• Staircases
• Slides
• Ski lifts
• Hilly roads

Explanation

• A pulley is a simple machine that uses grooved wheels and a rope to raise, lower, or move a load.
• It changes the direction of the force, making it easier to lift or move heavy loads.
• Examples: Raising a load and A flag pulley.

Explanation

According to Newton's 2nd law, the object's acceleration and centripetal force are in the same direction.

Explanation

Explanation

• In semiconductors, as the temperature increases, the conductivity increases.
• This is because heat energy excites more electrons into the conduction band, allowing them to flow more freely and increasing the conductivity.
• This is in contrast to metals, where conductivity typically decreases with increasing temperature.

Explanation

Crosslinking is a phenomenon in which a signal transmitted in one circuit or channel creates an undesired effect in another circuit or channel.

Explanation

Exponential notation (scientific notation) is used to express very small (e.g., 0.0000001) or very large (e.g., 1000000000) quantities compactly by representing numbers as powers of 10.

Key Information:

Format: a × 10^n, where 1 ≤ a < 10 and n is an integer.

Used for very large or very small numbers.

Examples:

• Large number: 6.022 × 10^23 (Avogadro's number)
• Small number: 1.6 × 10^-19 (Charge of an electron)