Look at the following pictures and state the effect of force: Is it moving the object, changing its shape or direction: 

 

Three blocks A, B and C of masses $4 \mathrm{kg}$, $2 \mathrm{kg}$ and $1 \mathrm{kg}$ respectively, are in contact on a frictionless surface as shown. If a force of $14 \mathrm{N}$ is applied on the $4 \mathrm{kg}$ block, then contact force between A and B is, 

Observe the vessels A, B, C and D shown in Figure carefully.

Volume of water taken in each vessel is as shown. Arrange them in the order of decreasing pressure at the base of each vessel. Explain.