Can you do my mock exam?
- 20 Dec 06, 04:26 PM
Here are a couple of questions from the paper, set one term into my physics A-level. Good luck!
1. (a) (i) Define the moment of a force.
(ii) State the principle of moments.
(b) The diagram below shows a pillar (lying horizontally) made of two uniform sections X and Y each of cross-sectional area 3.5 x 10-2. m2. The sections are made from two different materials. The weights of X and Y are shown acting through the centre of gravity of each section.
Show that the average density of the pillar is about 1800 kg m-3. .
(c) The pillar in (b) will balance horizontally supported vertically below the point P.
(i) Show, using the principle of moments, that the point P is 1.2m from the end B.
(ii) State the significance of point P.
2. (a) (i) Explain the concept of work and relate it to power.
(ii) Define the joule.
(b) A cable car is used to carry people up a mountain. The mass of the car is 2000 kg and it carries 800 people, of average mass 60 kg. The vertical height travelled is 900 m and the time taken is 5 minutes.
(i) Calculate the gain in gravitational potential energy of the 80 people in the car.
Gravitational potential energy gain = ……….J
(ii) Calculate the minimum power required by a motor to lift the cable car and its passengers to the top of the mountain.
Power =…..… unit………..
The exam questions were taken from an OCR past paper from 2001. If readers want to attempt more exam papers for fun, there are some specimen papers available at the OCR website.