Work & Energy

Work & Energy Principles

Articles
Title
Which of the following are nonconservative forces?(A) Spring force(B) Gravitational forces(C) The friction force(D) The force of air drag(E) The electric force
A box is pushed all the way up an incline at a constant speed of 3 m/s. An identical box is pushed all the way up the same incline at a constant speed of 6 m/s. What quantities are the SAME for these two scenarios?
Which of the following scenarios result in NO work done on the underlined object?(A) The gravitational force from the Earth acts on the Moon throughout its circular orbit.(B) A compressed spring launches a rock into the air.(C) A child pushes a box acro
A 2000-kg airplane flies at 343 m/s. What is its kinetic energy?
A spring with a constant of 400 N/m is stretched by 0.5 m. What is the elastic potential energy stored in the spring?
What happens to the kinetic energy of a car if its speed is doubled?
A spring is stretched 5 cm. What happens to its elastic potential energy if it is stretched 20 cm?
How much work must be done to accelerate a 700 kg car from 22 m/s to 30 m/s?
A 10-N force is applied horizontally on a box to move it 10 m across a frictionless surface. How much work was done to move the box?
Rank the gravitational potential energy of the object in each of the four scenarios below:I. A 2-kg object held at rest 3 m above the groundII. A 2-kg object falling down at a rate of 5 m/s at the instant its 3 m off the groundIII. A 1-kg object falling d

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