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Edexcel | Physics WPH0 | W 15 4 1 | 1 hour 30 minutes
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14
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When an object moves in a circular path at constant speed, a resultant force is required.

14
(a)
Add To Classified
2 Mark s

State why a resultant force is required and the direction of this force.

Velocity/direction changing Or (object is) accelerating

Force towards centre (of circle)

14
(b)
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When an aeroplane is flying there is an upward force called lift which acts at right

angles to the wings. When the aeroplane is flying in a straight line, the lift force is

equal to the weight of the aeroplane.

The diagram shows an aeroplane that is moving in a horizontal circle at constant

speed.

14
(b) (I)
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2 Mark s

Explain, in terms of forces, why the aeroplane is able to fly in a circular path.

(QWC – Work must be clear and organised in a logical manner using

technical wording where appropriate)

Identifies a horizontal component of lift Or refers to L sin θ

Which acts as a centripetal force

Or which provides a centripetal acceleration

Or force perpendicular to velocity of plane so acts to centre (of circle)

(MP2 dependent mark and only awarded for reference to a horizontal

force)

14
(b) (II)
Add To Classified
4 Mark s

By considering both the horizontal and vertical motion, calculate the radius of the

circular path of the aeroplane.

Radius =

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