Energy and work
4 marks · NormalA man pulls a cart in a straight line by applying a constant horizontal force of 120 N. The cart moves 5.0 m in the direction of the force.
Calculate the work done on the cart.
State the amount of energy transferred to the cart.
Explain what would happen to the work done if the force applied was doubled but the distance stayed the same.
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(a) 600 J
(b) 600 J
(c) The work done would double.
Show mark scheme and worked solution
Marking points
M1 (a) · 1 mark · Correct substitution into W=F×d
A1 (a) · 1 mark · Correct final answer (600 J)
B1 (b) · 1 mark · States energy transferred equals work done (follow-through)
B1 (c) · 1 mark · Correct explanation (work would double)
Worked solution
(a) Work done = 120 N × 5.0 m = 600 J
(b) The amount of energy transferred to the cart is 600 J, as this is equal to the work done.
(c) If the force applied is doubled, the work done will also double because work is directly proportional to force.