Work,Power,Energy

If 40N of force is applied to Rollo Koster's 10 kg cart over a distance of 50 meters, how much work is done?

• 8000 J

• 8000 N

• 4000 J

• 2000 J

Tags

NGSS.MS-PS3-5

NGSS.MS-PS2-2

A sailor pulls a boat a distance of 30.0 m along a dock using a rope that makes a 25 degree angle with the horizontal. How much work does the rope do on the boat if its tension is 255 N?

• 7.65 x 10³ J

• 6.93 x 10³ J

• 7.65 x 10³ N

• 5.23 x 10³ J

Tags

NGSS.MS-PS3-5

Work can be defined as a _____ acting over some amount of _____ to cause a change in _____.

• force, distance, energy

• force, time, energy

• force, time, distance

• force, distance, time

Which requires more power – a person walking up stairs or a person running up stairs?

• walking

• running

• they require equal power output

• no power is required at all

Tags

NGSS.MS-PS3-5

How much power is required to raise a 200-kg crate a vertical distance of 2 m in a time of 4 s?

• 400 W

• 1000 W

• 1600 W

• 4000 W

Tags

NGSS.MS-PS3-5

How much work is done on a 200-kg crate that is hoisted 2 m in a time of 4 s?

• 400 J

• 1000 J

• 1600 J

• 4000 J

Tags

NGSS.MS-PS3-5

NGSS.MS-PS3-4

Which requires more work – a person walking up stairs or a person running up stairs?

• walking

• running

• they require equal work

• no work is required for either because the movement is vertical

Tags

NGSS.MS-PS3-5

Which of the following is an example of work?

• Holding a bowling ball above your head

• A waiter holds a tray of food above his head while moving 6 meters at a constant speed across a crowded room

• A teacher applies a force to a wall to hold up a poster

• A puppy pushes a tennis ball 10 meters with his nose

Power is measured in which units?

• Newtons

• Joules

• Watts

• Joule/sec

A moving 10 kilogram object has 20 Joules of kinetic energy. What is its velocity?

• 2 m/s
• 4 m/s
• 200 m/s
• 10 m/s

Tags

NGSS.MS-PS3-1