Science Revision for 21/06/17

Different Forces:

1. Electrostatic - The force of attraction or repulsion between two charged particles (e.g electrons and protons)

2. Magnetic Force - The attractive or repulsiveforce exterted on a pole ( e.g north and south ) or a moving electric charge

3. Friction - The force that opposes the motion of two surfaces in contact with each other.

4.Upthrust - The upwards force in water ,equal to the weight of displaced water.

5.Thrust - The force from an engine which causes an object to move forward

6. Air Resistance - The forces that oppose motion in the air or liquids,due to the collision of particles with the object.

7. Gravity -The force between any two bodies /objects with mass

8. Tension - The oulling force exerted (apply or bring to bear (a force, influence, or quality).

What happens when you put copper sulfate in water-

Water is driven off from hydrated copper sulfate when it is heated, so the forward reaction is endothermic - energy must be transferred from the surroundings for it to happen. When water is added to anhydrous copper sulfate, enough heat is released to make the water

Nucleus :contains genetic material, which controls the activities of the cell

Cytoplasm: most chemical processes take place here, controlled by enzymes

Cell membrane:controls the movement of substances into and out of the cell

Mitochondria: most energy is released by respiration here

Ribosomes: protein synthesis happens here

What are the extra parts in a Plant Cell ?

Nucleus: contains genetic material, which controls the activities of the…