Physical Science In Class Final

Front

What is the law of conservation of energy?

Back

The law of conservation of energy states that energy cannot be created or destroyed, only transformed from one form to another.

Front

Define kinetic energy.

Back

Kinetic energy is the energy an object possesses due to its motion, calculated as KE = 1/2 mv², where m is mass and v is velocity.

Front

What is potential energy?

Back

Potential energy is the stored energy of an object due to its position or state, commonly associated with gravitational potential energy, calculated as PE = mgh, where m is mass, g is acceleration due to gravity, and h is height.

Front

What is work in physics?

Back

Work is defined as the transfer of energy that occurs when a force is applied over a distance, calculated as W = Fd, where W is work, F is force, and d is distance.

Front

How do you calculate the weight of an object?

Back

Weight is calculated using the formula W = mg, where W is weight, m is mass, and g is the acceleration due to gravity (approximately 9.81 m/s² on Earth).

Front

What is the formula for calculating mechanical energy?

Back

Mechanical energy is the sum of kinetic energy and potential energy in a system, expressed as ME = KE + PE.

Front

What is the difference between mass and weight?

Back

Mass is a measure of the amount of matter in an object, while weight is the force exerted by gravity on that mass.

Front

What is sodium carbonate?

Back

Sodium carbonate (Na₂CO₃) is a chemical compound used in glass making, as a cleaning agent, and in various chemical processes.

Front

What happens to the temperature of a substance during a phase change?

Back

During a phase change, the temperature of a substance remains constant while it absorbs or releases energy.

Front

What is the significance of a frictionless surface in physics problems?

Back

A frictionless surface allows for the simplification of calculations by eliminating the force of friction, making it easier to analyze motion and energy.