AP Physics - Work and Power

Front

What is the formula for calculating work done when a force is applied?

Back

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

Front

Define power in the context of physics.

Back

Power is the rate at which work is done or energy is transferred over time. It is calculated as Power (P) = Work (W) / Time (t).

Front

What is the unit of work in the International System of Units (SI)?

Back

The unit of work is the Joule (J).

Front

How do you calculate the gravitational potential energy of an object?

Back

Gravitational Potential Energy (PE) = mass (m) x gravitational acceleration (g) x height (h).

Front

What is the Work-Energy Theorem?

Back

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

Front

If a force is applied at an angle, how does it affect the work done?

Back

Only the component of the force in the direction of motion does work. The work done is calculated using the cosine of 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 energy. When work is done, energy is transferred to or from the object.

Front

How do you calculate the power required to lift an object at a constant speed?

Back

Power (P) = Weight (mg) x Velocity (v), where m is mass and g is the acceleration due to gravity.

Front

What is the significance of the net force in calculating work done?

Back

The net force determines the actual force that causes displacement, and thus it is used to calculate the work done on an object.

Front

What is the formula for calculating the depth of a pit if the work done to lift an object is known?

Back

Depth (d) = Work (W) / (mass (m) x g), where g is the acceleration due to gravity.