Honors Physics Additional Review 2024 | Energy, Work, & Power

Front

What is energy?

Back

Energy is the ability to do work or cause change. It exists in various forms, such as kinetic, potential, thermal, and chemical energy.

Front

What is 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.

Front

Define work in physics.

Back

Work is done when a force causes an object to move. It is calculated as the product of the force and the distance moved in the direction of the force (W = F × d).

Front

What is power in the context of physics?

Back

Power is the rate at which work is done or energy is transferred. It is calculated as Power = Work / Time.

Front

How do you calculate gravitational potential energy?

Back

Gravitational potential energy (PE) is calculated using the formula PE = mgh, where m is mass, g is the acceleration due to gravity, and h is height.

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 happens to the energy of a skater at the highest point of a jump?

Back

At the highest point of a jump, the skater's kinetic energy is converted into gravitational potential energy.

Front

If a 2 kg ball falls from a height of 1.5 meters, what is its potential energy at the top?

Back

Potential energy (PE) = mgh = 2 kg × 9.8 m/s² × 1.5 m = 29.4 J.

Front

How does increasing the time taken to do work affect power?

Back

Increasing the time taken to do the same amount of work decreases power, as power is inversely proportional to time.

Front

What is the formula for calculating work done against friction?

Back

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