Forces, Densities, and Gravitational Attraction

Front

What is energy conservation?

Back

Energy conservation refers to the practice of using less energy by reducing waste and increasing efficiency. In a flashlight, energy is conserved by transforming chemical energy from the battery into electrical energy and then into radiant energy (light).

Front

What are the three forms of energy transformation in a flashlight?

Back

The three forms of energy transformation in a flashlight are: 1. Chemical energy (from the battery) 2. Electrical energy (when the flashlight is turned on) 3. Radiant energy (light emitted from the flashlight).

Front

What is density?

Back

Density is a measure of how much mass is contained in a given volume. It is usually expressed in grams per milliliter (g/ml) or kilograms per cubic meter (kg/m³).

Front

How do you calculate density?

Back

Density is calculated using the formula: Density = Mass / Volume. For example, if a liquid has a mass of 10 grams and a volume of 5 milliliters, its density would be 2 g/ml.

Front

What is the density of water?

Back

The density of water is 1.0 grams per milliliter (g/ml). This is a standard reference point for comparing the densities of other substances.

Front

What happens to the density of an object when it is heated?

Back

Generally, when an object is heated, its density decreases because the substance expands, increasing its volume while the mass remains the same.

Front

What is gravitational attraction?

Back

Gravitational attraction is the force that pulls two objects toward each other due to their mass. The strength of this force depends on the masses of the objects and the distance between them.

Front

What is the formula for calculating gravitational force?

Back

The formula for calculating gravitational force is: F = G * (m1 * m2) / r², where F is the gravitational force, G is the gravitational constant, m1 and m2 are the masses of the objects, and r is the distance between their centers.

Front

What is net force?

Back

Net force is the overall force acting on an object when all the individual forces are combined. It determines the object's motion. If forces are in the same direction, they are added; if they are in opposite directions, they are subtracted.

Front

What is the difference between balanced and unbalanced forces?

Back

Balanced forces are equal in size and opposite in direction, resulting in no change in motion. Unbalanced forces result in a net force that causes an object to accelerate or change direction.