Work & Energy

Work & Energy Principles

Articles
Title
A 2000-kg airplane flies at 343 m/s. What is its kinetic energy?
A 1000-kg car traveling at 30 m/s skids 10 m before it stops. What magnitude of force is the frictional force on the car?
A boy pulls a 10-kg box across an ice rink for a distance of 50 m. He exerts a constant force of 10 N on a rope attached to the box at an angle of 60°. How much work has he done on the box?
A mover uses a pulley system to lift a grand piano with a mass of 500 kg from the ground to a height of 10 m. What is the change in the pianos gravitational potential energy?
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 70-kg man runs at a constant velocity of 2 m/s. What is his kinetic energy?
An archer pulls a bowstring back a distance of 20 cm with an average force of 75 N. The arrow has a mass of 20.0 g. When he releases the string, what is the velocity of the arrow when it leaves the bow?
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?
What happens to the kinetic energy of a car if its speed is doubled?
An object is initially at rest. A force of 2 N exerted on an object for5 m increases the objects velocity by 1 m/s. What was the mass of the object?

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