Ordinary level 2025 West catholic mock physics 2
Ordinary level 2025 West catholic mock physics 2
1.
(a) Define a Force (1mk)
(b) Name the type of force responsible for the following observations;
| (i) (ii) |
A plastic ruler rubbed on dry hair attracts small pieces of papers (1mk) A fruit cut from a tree falls to the ground (1mk) |
(c) (i) Define Heat capacity (1mks)
(ii)Name a material with a low specific heat capacity and state its application for this property.
(2mk)
(d) i. Define Convection(1mk)
ii. State an application of convection in everyday life (1mks)
(8mks)
2. The diagram in figure 1 below shows a lorry pulling a log of wood of weight 50N with an iron
cable
The tension of the cable is 3000N and the friction between the log and the ground is 500N,
a) Draw a diagram to show all the forces acting on the wood(4mks)
b) Find the resultant horizontal force that acting on the wood(2mks)
c) Find the acceleration of the wood in the horizontal direction (2mks)
(8mrks)
3. A carpenter releases a stone of 0.5kg from the first floor of a storey building to fall freely under
gravity. Given that the height from the ground floor to the first floor of the building on which he
is lying is 3.6m.
a)Calculate;
i.The Potential energy of the stone just before it starts falling. (2mks)
ii.The velocity at which the stone hits the ground. (2mks)
b)State one energy change that occurs as the stone hits the surface. (1mk)
(5mks)
4. The element 146𝐶 is an isotope of Carbon and has a half-life of 5600 years. It decays to an
element of Nitrogen 147𝑁 .
(a) Define the term Half- life. (1mk)
(b) State which kind of decay it undergoes. (1mk)
(c) Write a balanced nuclear equation to show the decay process. (1mk)
(d) Determine the time for which the fraction of undecayed C-14 remaining is 1
4
of its original
