PSCP Work, Power, Energy

Front

What is gravitational potential energy (GPE)?

Back

Gravitational potential energy (GPE) is the energy an object possesses due to its position in a gravitational field, typically calculated as GPE = mgh, where m is mass, g is the acceleration due to gravity, and h is height.

Front

Which object has the least gravitational potential energy?

Back

A ball sitting on the ground has the least gravitational potential energy compared to objects at higher elevations.

Front

What happens when the direction of displacement is the same as the direction of the applied force?

Back

Positive work is done on the object.

Front

What is the formula for calculating work done?

Back

Work done (W) is calculated as W = Fd cos(θ), where F is the force applied, d is the displacement, and θ is the angle between the force and displacement direction.

Front

If a student holds a book bag without moving it, how much work is done?

Back

No work is done on the book bag because there is no displacement.

Front

How is power defined in physics?

Back

Power is defined as the rate at which work is done, calculated as Power (P) = Work (W) / Time (t).

Front

How much power is required to do 40.2 J of work in 3.3 seconds?

Back

12 Watts of power is required.

Front

What is the force required to lift an object?

Back

The force required to lift an object is equal to its weight, calculated as Force (F) = mass (m) × acceleration due to gravity (g).

Front

What is the weight of a 6.8 kg object on Earth?

Back

The weight is calculated as Weight = mass × gravity = 6.8 kg × 9.8 m/s² = 66.64 N, approximately 67 N.

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 cannot be created or destroyed.