Energy and work

3 marks · Normal

Figure 1 shows a girl pulling a suitcase with a force of 30 N over a horizontal distance of 8 m on a smooth airport floor.

(a)

Calculate the total work done by the girl on the suitcase.

[2 marks]

(b)

What is the energy transferred to the suitcase?

[1 mark]

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Show answer

(a) 240 J

(b) 240 J

Show mark scheme and worked solution

Marking points

M1 (a) · 1 mark · Correct substitution into W=F×d

A1 (a) · 1 mark · Correct calculation (240 J)

B1 (b) · 1 mark · States energy transferred equals work done (240 J) (follow-through)

Worked solution

(a) Work done = force × distance = 30 N × 8 m = 240 J

(b) The energy transferred to the suitcase is 240 J, because the work done equals the energy transferred.