Work and Power

Tina and her puppy are tugging on a rope, each pulling on opposite ends. When is Tina doing work?

When work is measured in joules and time is measures in seconds, power is measured in __________

If 600 J of work is done in 3 s, what is the power? (Power: P = W/t)

Shani poses as the Statue of Liberty for an art class. She holds a torch above her head with her right hand and a book against her side with her left hand. She holds the pose for 10 minutes. At the end of the session, she mentions to her friend that it was a lot of work to pose and that her arms are really tired. Which describes the work Shani did while she posed?

A lawnmower engine running for 20 mins does 4,560,000 J of work. What is the power output of the engine? (Power: P = W/t)

What is needed for work to be done?

Pablo prepares to lift a barbell. During which stage of the lift does Pablo do work on the barbell?

Sierra did 500 J of work to move her couch. If she exerts 250 N of force on the couch, how far did she move it? (Work: W = Fd)

The rate at which work is done is called ________

Joshua programs a robotic arm to place a block in a box by following a sequence of commands in the table. During which step does the robotic arm do work on the block?

Henry can lift a 200 N load 20 m up a ladder in 40 s. Ricardo cab lift twice the load up one-half the distance in the same amount of time. Which comparison between Ricardo and Henry is correct?

A force acts on an object and moves it a certain distance. The product of the force and the distance is the _______ done on the object

A gust of wind blowing east pushes against a ball. When will the wind do work on the ball?

Den pushes a desk 400 cm across the floor. He exerts a force of 10 N for 8 s to move the desk. What is his power output? (Power: P = W/t)