Kinematics and Energy 12.14

Front

What is power in physics?

Back

Power is the rate at which work is done or energy is transferred over time, measured in watts (W).

Front

How is work calculated?

Back

Work is calculated using the formula: Work = Force x Distance x cos(θ), where θ is the angle between the force and the direction of motion.

Front

What is the relationship between work and energy?

Back

Work done on an object results in a change in its energy. Energy can be transferred or transformed but is conserved in a closed system.

Front

What is kinetic energy?

Back

Kinetic energy is the energy of an object due to its motion, calculated using the formula: 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 configuration, commonly gravitational potential energy calculated as PE = mgh, where h is height.

Front

What happens to potential and kinetic energy when an object falls?

Back

As an object falls, its potential energy decreases while its kinetic energy increases, conserving total mechanical energy.

Front

What is the principle of conservation of energy?

Back

The principle states that energy cannot be created or destroyed, only transformed from one form to another, and the total energy in a closed system remains constant.

Front

What is the formula for calculating power?

Back

Power can be calculated using the formula: Power = Work / Time.

Front

If no movement occurs, what can be said about work?

Back

If an object does not move, no work is being done on the object, regardless of the force applied.

Front

What is the unit of energy?

Back

The unit of energy is the joule (J), which is equivalent to one newton-meter.