More Science! More Science!

Gr. 5s...Some Questions:

FORCES ACTING ON STRUCTURES AND MECHANISMS

 (a) What is a tornado? Where does the force of a tornado come from? What kinds of damage does a tornado inflict on the built environment (e.g., on structures such as houses and shopping malls)? What is the impact of a tornado on the natural environment (e.g., on trees, on animals such as fish and birds)? How can humans protect them- selves from the force of a tornado? (b) What is an earthquake? Where does the force of an earthquake come from? How is the damage from an earthquake different from that of a tornado? What is the impact of an earthquake on the natural environment? What can humans do to protect themselves from the forces of an earthquake?

https://www.youtube.com/watch?v=XdCuguqdYtE

https://www.youtube.com/watch?v=A2uwgHSsdps

Gr.4s...Some Thoughts:

PULLEYS AND GEARS

(a) Escalators run all the time, using large amounts of electrical energy. (b) A clothesline and a clothes dryer, which use pulleys or gears, are both used to dry clothes. Using a clothes dryer is faster than drying clothes on a line, but the environmental impact of the dryer is greater because it uses electricity or natural gas. (c) Gears reduce the effort needed to pedal a bicycle, but riding a bicycle still requires more effort and takes longer than driving a car to the same destination. However, the bicycle is more environmentally friendly because it does not use fossil fuel.

https://www.youtube.com/watch?v=xgDGLVd9QxI