9th grade physics

1. pressure is force per unit area.
2. a rectangular wooden block measuring 0.250 m x 0.125 m x 0.840 m is resting on a table top. it has mass of 15 kg. calculate the greatest pressure and least pressure!
3. great pressure can be overcome by sharing the pressure to large area.
4. work is force per distance of an object.
5. Please give examples of work.
6.energy can only be changed, it can not be created or destroyed.
7. Energy is the capability to do work
8. there are several kinds of energy, they are chemical, potential, elastic and kinetic energy.
9. Power is the rate of work done
10. Brownian law states that all particles move in random and constant motion