Adv Phys Sci-Section 1 -CH 4-5-Forces/Motion Density Buoyancy

Front

What is density?

Back

Density is the mass of a substance divided by its volume, typically expressed in grams per milliliter (g/mL) or kilograms per cubic meter (kg/m³).

Front

How do you calculate density?

Back

Density (D) = Mass (m) / Volume (V). For example, if a substance has a mass of 11.2 grams and a volume of 10 mL, its density is 1.12 g/mL.

Front

What is buoyancy?

Back

Buoyancy is the ability of an object to float in a fluid, which is determined by the object's density compared to the density of the fluid.

Front

What is the principle of buoyancy?

Back

The principle of buoyancy, also known as Archimedes' principle, states that an object submerged in a fluid experiences an upward force equal to the weight of the fluid displaced by the object.

Front

What factors affect buoyancy?

Back

Buoyancy is affected by the density of the fluid, the volume of the object submerged, and the gravitational force acting on the object.

Front

What is the relationship between pressure and surface area?

Back

Pressure is defined as force per unit area. Decreasing the surface area while applying the same force increases the pressure.

Front

How does a sharp knife cut better than a dull knife?

Back

A sharp knife has a smaller surface area at the edge, which increases the pressure applied to the material being cut, allowing it to slice through more easily.

Front

What is the formula for pressure?

Back

Pressure (P) = Force (F) / Area (A).

Front

What is the unit of pressure in the SI system?

Back

The SI unit of pressure is the Pascal (Pa), which is equivalent to one newton per square meter (N/m²).

Front

What is the effect of temperature on density?

Back

Generally, as temperature increases, the density of a substance decreases because the substance expands, increasing its volume.