Work Power & Energy

Which does not illustrate kinetic energy?

• It is expressed in Joule.

• It depends upon the objects’ mass and speed.

• It is the energy an object possesses due to its motion.

• It depends upon the objects’ mass and objects’ height.

A 100 N force is applied to move an object a horizontal distance of 5 meters at constant speed in 10 seconds. How much power is done?

• 50J

• 50W

• 500J

• 500W

Which statement illustrates work done?

• A weightlifter holds a barbell above her head.

• A teacher applies a force to a wall and becomes exhausted.

• A rolling marble hits a note card and moves it across a table.

• A waiter carries a tray full of meals across a dining room at a constant speed.

A weightlifter holds a 100 kg barbell above her head. Is work done?

• Yes because there is a force applied to the barbell and the force causes a displacement of the barbell.

• Yes because there is an upward force applied to the barbell and the barbell moves vertically.

• No because no displacement occurred.

• No because there is no force applied.

How do you find our long test via online quiz?

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How do you calculate power?

• P = W/t
• P = E/t
• P = w * t
• P = bbq/chicken

How much work is being done with 200 N of force over 426 meters?

• 85,200 J
• 45,620 J
• 90,480 J
• 62,329 J

The SI unit of work is?

• Joules
• Watts
• Newtons
• meters

The SI unit for power is...?

• Watts
• Joules
• Newtons
• Meters

If 68 Joules were necessary to move a 4 Newton crate, how far was the crate moved?

• 272 m
• 17 m
• 4.05 m
• 272 cm