Foundation November 2020 Paper 1 Q21
21.
| Use: \(\text{Pressure} = \dfrac{\text{Force (N)}}{\text{Area (cm}^2\text{)}}\) |
A camera is attached to a tripod.
The tripod has 3 legs and stands on horizontal ground.
Each leg exerts the same pressure on the ground.
The tripod has a weight of 34 N.
The camera has a weight of 20 N.
Each foot of the tripod is a rectangle with length 3 cm and width 2 cm.
Work out the pressure exerted by the tripod and camera on the ground.
You must show all your working. [5]
Pressure = ……… N/cm2
| Scheme | Marks | Comments |
|---|---|---|
| (Total Force =) 54 (newtons) si | B1 | |
| (Total area = 3 × 6 =) 18 (cm2) si | B2 | B1 for 3 × 2 × 3 or 6(cm2) si or for sight of ‘their area of one foot’ × 3 |
| (Pressure =) 54 ÷ 18 | M1 | May be seen in stages e.g. 54 ÷ 3 ÷ 6 FT ‘their 54’ and ‘their 18’, providing at least 34 + 20 and 3 × 2 × 3 attempted NB 54 ÷ 6 ÷ 3 also implies B2 (Common answer 54 ÷ 6 = 9 earns B1 B1 M0 A0, 2 marks) |
| 3 (N/cm2) | A1 | FT |
| (5) |