My research for my 3 favourite experiments

1. COMPARE THE ABSORPTION OF DIFFERENT BRANDS OF PAPER TOWEL

The difference between paper towels and other types of paper comes when the paper fibers are mixed with a special type of resin to make them strong when they are wet.  This is why paper towel don’t rip as easily when wet. When the sheet are being manufactured they have shapes pressed into them to make them look quilted.  These shapes form air pockets to attract water.  That is why paper towels are so absorbent. Different brands of paper towels have different methods for manufacturing their paper towels. Therefore they should have different rates of absorbency.

2. DOES TEMPERATURE AFFECT THE TIME TAKEN FOR SUBSTANCES TO DISSOLVE IN WATER

When a solid substance, dissolves into a liquid substance, they react to form an intimate mixture called a solution. This process of dissolution will not occur if the particles of both substances are unable to bond together. For dissolution to occur requires energy, known as activation energy, to break and reconnect bonds. The temperature of a substance will affect the energy within the substance's molecules. This means that a solvent at a higher temperature should have more energy is the dissolution process making it easier to break form a solution. This would then be the opposite for when the temperature of the solvent is cooler.

·       3. HOW DOES THE HEIGHT OF A RAMP AFFECT THE TIME TAKEN FOR A TOY CAR TO REACH THE BOTTOM?

·       A child playing with a toy car illustrates Newton's three laws of motion. These three basic laws come into play whether the child is pushing the car across the floor or sliding it down a ramp. These are the laws:

1) An object at rest will stay at rest unless a direct force is exerted upon it.

2) Force equals mass times acceleration. The greater the acceleration required, the greater the force needed to act upon it.

3) Every action has an equal and opposite reaction. When a child pushes a toy car, it pushes his body back in the opposite direction.

The car accelerates as it comes down the ramp because of the effect of the parallel component of gravity on the car. This force pulls it down toward the bottom of the ramp. The greater the angle of the ramp, the stronger the parallel force of gravity is, and the faster the car will accelerate. Friction can also affect how fast the car goes down the ramp.