Challenge 3.3

Science
Chapter 3
3.3 review

During cold winters, ice can form on small lakes and ponds. Many people enjoy skating on the ice. Occasionally, a person skates on thin ice and breaks through it.
Why do rescue workers lie flat on the ice instead of walking upright when reaching out to help rescue a skater?

Because of their weight and elevation they would break the ice and fall into the water

Challenge 3.2

Science
Chapter 3
3.2 Review

If you push a book against the wall hard enough, it will not slide down even though gravity is pulling it. Use waht you know about friction and Newton's laws of motion to explain why the book does not fall.

With my amount of force pushing to the opposite direction of the book and the wall mass I could make  that the book cuold remain in the same place because the two forces were balanced so as Newton says if two forces acting in opposite directions on an object are balanced, the object don't move.

Challenge 3.1

Science
Chapter 3
3.1 review

Precision measurements of the acceleration  due to gravity show that the acceleration is slightly different in different locations on Earth. Explain why the force of gravity is not exatly the same everywhere on Earth's surface.

Because of the air, gravity effect may change. If you are in Mount Everest, you'll have less gravity force. If you are in the deep ocean there will be more gravity for the air and water's pressure.

My Man Isaac Newton

My Man Isaac Newton

This video talks about Isaac Newton , a real scientist.
Since young he discovered many things.
Isaac was extremely inteligent ; He invented the three laws and discovered the gravity , how the planets work and other many things.

Science Assingnment

*Why Kevin Joa fell of the chair?* 

Kevin Joa fell because he didn't apply any force and gravity being the only unbalanced force he fell.