CAIE IGCSE Physics 1.1.7 Determine By Calculation or Questions

Practise adding vectors with scale diagrams and calculations to determine resultant forces and velocities by magnitude and direction in Cambridge IGCSE Physics problems.

Exam points

Add vectors graphically and resolve resultant forces or velocities by magnitude and direction.

[Maximum number: 4]

A load is suspended from a thread. The vertical force on the thread due to the load is 0.75 N .

Fig. 1.1 shows the load suspended from the thread.

Fig. 1.1

A wire is attached to the load at point X and pulled horizontally to the right.
The tension in the horizontal wire is 1.2 N .
By drawing a scale diagram or by calculation, determine:
- the magnitude of the resultant of the force at X due to the load and due to the tension in the wire
- the direction of the resultant relative to the vertical direction.

Show your working. N direction of resultant relative to vertical = ${ }^{\circ}$

2 vectors at right angles & OR &
use of Pythagoras' theorem e.g. $a^{2}+b^{2}=c^{2}$

OR (force $=) \sqrt{ }\left(1.2^{2}+0.75^{2}\right)$

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Figure for Answer to Question CAIE IGCSE Physics 1.1.7 Determine By Calculation or Questions question 1 — CAIE IGCSE Physics

1.4 (N)
58( ${}^{\circ}$ )}
resultant force including correct direction of arrow & OR & use of trigonometry to find angle e.g. $\tan \theta=1.2 / 0.75$

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CAIE IGCSE Physics 1.1.7 Determine By Calculation or Questions question 1