6.4 Work Done

Which one of the following causes your shoes to wear out?

• Weight

• Friction

• Pressure

• Polishing

Which of the following is measured in newtons (N)?

• Size

• Mass

• Energy

• Friction

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

Brandon pushes a 5 N load for 4 m. Khalisha pushes a 10 N load for 2 m. Which of the following statements is true?

• Khalisha has done more work than Brandon

• Brandon has done more work than Khalisha

• Both Brandon and Khalisha did not do any work

• Both Brandon and Khalisha have done the same amount of work

Tags

NGSS.MS-PS3-5

Syaahir carried a sack of 'Beras Laila' weighing 100 N up a flight of stairs of 12 m. Calculate the work done by Zainal if his body weight is 550 N?

• 9750 joules

• 8250 joules

• 7800 joules

• 6600 joules

Tags

NGSS.MS-PS3-2

NGSS.MS-PS3-4

Which of the following situation is no work done?

• Holding a box on top of your head

• lifting a box from the ground to your shoulder

• putting the box down to a table from your hand

• moving the box from the table to on top of your head.

Adlan weights 500 N. He climbs up the escalator and reach the first floor in 25 seconds. The height of the escalator is 10m and the length is 15 m. Calculate the work done by Adlan?

• 0 J

• 5000 J

• 7500 J

• 125 000 J

Hazeeqah runs up a hill through a height of 5 metres in 50 seconds. Calculate the work done in reaching the top of the hill?

• 500 / 50 = 10 Nm

• 500 / 5 = 100 Nm

• 500 X 5 = 2500 Nm

• 500 X 50 = 25 000 Nm

Tags

NGSS.MS-PS3-4

Keirra lifted two dumb bells (40 N each) 80 cm above the floor as shown in figure below. Calculate the work done by Keirra?

(Make sure to use the correct units and read all the details!)

• 10 joules

• 64 joules

• 640 joules

• 1280 joules

Tags

NGSS.MS-PS3-4

There is no work done when a box is moved across the room. True or false?

• True

• False

In which of the following situation is work done? (remember for work to be done, what is needed?)

• push ups

• pushing a wall

• carrying a box up the stair case

• holding a box while standing