APP1 Work, Energy, Power

Front

What is Work in physics?

Back

Work is defined as the product of the force applied to an object and the distance over which that force is applied, in the direction of the force. It is calculated using the formula: Work = Force × Distance × cos(θ), where θ is the angle between the force and the direction of motion.

Front

Define Kinetic Energy.

Back

Kinetic Energy is the energy that an object possesses due to its motion. It is calculated using the formula: KE = 1/2 mv², where m is the mass of the object and v is its velocity.

Front

What is Power in physics?

Back

Power is the rate at which work is done or energy is transferred over time. It is calculated using the formula: Power = Work / Time.

Front

Explain the principle of Conservation of Energy.

Back

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

Front

What is the relationship between Work and Kinetic Energy?

Back

The Work-Energy Theorem states that the work done on an object is equal to the change in its kinetic energy. If work is done on an object, its kinetic energy increases.

Front

How does friction affect work done on an object?

Back

Friction opposes the motion of an object, which means that it does negative work. This reduces the total work done on the object and can decrease its kinetic energy.

Front

What is Gravitational Potential Energy?

Back

Gravitational Potential Energy is the energy an object possesses due to its position in a gravitational field. It is calculated using the formula: PE = mgh, where m is mass, g is the acceleration due to gravity, and h is height.

Front

How do you calculate the power required to lift an object?

Back

Power required to lift an object can be calculated using the formula: Power = (Weight × Height) / Time, where Weight = mass × gravity.

Front

What is the significance of the angle in the work formula?

Back

The angle θ in the work formula (Work = Force × Distance × cos(θ)) determines how much of the applied force contributes to the work done in the direction of motion. A smaller angle means more work is done.

Front

What happens to the kinetic energy of two objects pushed with the same force over the same distance?

Back

If two objects are pushed with the same force over the same distance, they will have the same kinetic energy when the force is removed, regardless of their masses.