HW4.1 Work, Power, and Energy

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 measured in joules (J).

Front

How do you calculate work done when a force is applied?

Back

Work (W) = Force (F) × Distance (d) × cos(θ), where θ is the angle between the force and the direction of motion.

Front

What is the unit of work?

Back

The unit of work is the joule (J), which is equivalent to one newton meter (N·m).

Front

What is power in physics?

Back

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

Front

How do you calculate power?

Back

Power (P) = Work (W) / Time (t).

Front

What is kinetic energy?

Back

Kinetic energy is the energy of an object 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 gravitational potential energy, calculated as PE = mgh, where m is mass, g is acceleration due to gravity, and h is height.

Front

What is the relationship between work and energy?

Back

Work done on an object results in a change in energy. If work is done on an object, its energy increases; if work is done by an object, its energy decreases.

Front

What is the work-energy principle?

Back

The work-energy principle states that the work done on an object is equal to the change in its kinetic energy.

Front

What is the difference between positive and negative work?

Back

Positive work occurs when the force and displacement are in the same direction, while negative work occurs when the force and displacement are in opposite directions.