work power

Who has the most power?

• Ms. McDonald who rides her bike using 12000J of work in 600 s.

• Mrs. Clarke who studies her 5 lessons for the next classes in 15 minutes.

• Ms. Sobray who used 50J energy to carry fish 10 meters down the hall.

• Mr. Schrader who watches his learners while taking their quiz in 30 minutes.

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 student carrying a backpack up the stairs.

• 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.

If you use 30 J of energy to move an object, you have done ____ J of work.

• 3

• 10

• 30

• 0

Jane carries a 5 kg box and Lorie carries a 10 kg box up a set of stairs, who did more work?

• Jane because his box was lighter.

• Lorie because her box weighed more.

• Can't tell.

Tags

NGSS.MS-PS3-2

You push a crate with a force of 100 N for 5 meters. How much work did you do?

• 500 J

• 100 J

• 50 J

• 5 J

Tags

NGSS.MS-PS3-5

How much power is generated by Ashley (50 kg) running up a 6 m flight of stairs in 5 seconds?

• 60 W

• 62 W

• 600 W

• 1500 W

Tags

NGSS.HS-PS2-1

If you run up the stairs slower you will

• do more work.

• do less work.

• generate more power.

• generate less power.

How do you calculate power?

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