CAIE IGCSE Physics 1.7.2.2 Recall Use for Mechanical Working W Questions

Practise calculating work done by a force with W = Fd and relating work to energy transfer using CAIE IGCSE Physics questions and mark schemes.

Exam points

Calculate work done by a force using W = Fd and relate work to energy transfer.

[Maximum number: 4]

A car accelerates uniformly in a straight line from rest at time t=0. At $t=3.2 \mathrm{~s}$ , the speed of the car is $13.0 \mathrm{~m} / \mathrm{s}$ .

The car decelerates from $13.0 \mathrm{~m} / \mathrm{s}$ to $0 \mathrm{~m} / \mathrm{s}$ at a constant deceleration. The mass of the car is 1350 kg . The car travels 13 m in 2.0 s as it decelerates.

Show that the work done by the car as it decelerates is approximately $1.1 \times 10^{5} \mathrm{~J}$ .

$(W=) F \times d$ $F=m a \mathbf{O R} F(\Delta) t=m \Delta v$ $F=(1350 \times 13) \div 2$ OR $8775(\mathrm{~N})$ OR $(F=) 1350 \times 6.5$ $W=8775 \times 13.0\left(=1.1 \times 10^{5} \mathrm{~J}\right)$ OR $114075(\mathrm{~J})$

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CAIE IGCSE Physics 1.7.2.2 Recall Use for Mechanical Working W Questions question 1