Energy and Work Concepts in Physics

In physics, what is work?

• The amount of effort put into a task.

• The application of force over a certain distance to a system.

• The rate at which energy is transferred.

• The ability to do work.

A box is pulled across the floor with a constant force of 50 Newtons over a distance of 5 meters, with the force applied parallel to the ground. How much work is done on the box?

• 10 Joules

• 55 Joules

• 250 Joules

• 500 Joules

How is work related to energy in physics?

• Work is the rate at which energy is created.

• Work is the total amount of energy in a system.

• Work is a change in energy.

• Work and energy are unrelated concepts.

What is the kinetic energy of a 20 kg box moving at a velocity of 4 meters per second?

• 40 Joules

• 80 Joules

• 160 Joules

• 320 Joules

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What is the formula for gravitational potential energy?

• PE_gravity = 1/2 mv^2

• PE_gravity = mgh

• PE_gravity = Fd

• PE_gravity = 1/2 kx^2

What is the formula for spring potential energy?

• PE_spring = mgh

• PE_spring = Fd

• PE_spring = 1/2 kx^2

• PE_spring = kx

Which of the following best describes a conservative system?

• A system that loses energy through work.

• A system where energy is literally disappearing from the universe.

• A system where the sum of kinetic and potential energy remains constant.

• A system that generates heat due to friction.

What is the primary definition of average power in terms of work and time?

• Work multiplied by time.

• Work divided by time.

• Force multiplied by distance.

• Force multiplied by velocity.