Explanation

Near Earth's surface, the acceleration due to gravity is 9.8 m/s2 (32 ft/s2).

This means that, ignoring the effects of air resistance,

the speed of an object falling freely will increase by about 9.8 meters per second (32 ft/s) every second.

Explanation

Explanation

In most automobiles, only about 10%–15% of the chemical energy in gasoline is converted into mechanical energy to move the car.

The rest is lost as heat, friction, and through the exhaust system.

Explanation

Aerosol cans are typically made of metal (aluminum or steel).

It often contain recycled content, usually over 25%.

These containers are recyclable.

Explanation

A fuse is a thin wire that melts and breaks the circuit if too much current flows, protecting appliances.

It acts as a safety device to prevent damage from overheating or short circuits.

Explanation

Explanation

Balanced forces are equal in magnitude but act in opposite directions, resulting in no net force (Newton's First Law).

The individual forces have opposite directions, even though their effects cancel out.

Explanation

Explanation

Solar cells, also known as photovoltaic cells, convert solar energy (sunlight) directly into electrical energy.

They work by using semiconductor materials to absorb photons from sunlight and release electrons, generating electricity.

Explanation

Steel, being a solid metal, is measured by weight.

The standard unit for measuring steel is kilograms or tons, depending on the quantity.