7.6(B) distinguish between physical and chemical changes in matter in the digestive system; and

Transcription

1 7.6(B) distinguish between physical and chemical changes in matter in the digestive system; and 7.7(B) illustrate the transformation of energy within an organism such as the transfer from chemical energy to heat and thermal energy in digestion; and 7.7(A) contrast situations where work is done with different amounts of force to situations where no work is done such as moving a box with a ramp and without a ramp, or standing still; Balanced Forces Forces on an object that do not change the motion of the object. Balanced Forces balanced forces Forces on an object that are equal in size and opposite in direction. Cancel each other and causes no motion. Equal forces acting on an object in opposite directions Chemical Energy energy stored in the bonds of molecules and compounds (all living and once living things)

2 chemical energy Chemical to Electrical Energy Chemical to Electrical to Light Energy Chemical to Kinetic Energy Chemical to Thermal and Light Energy

3 Chemical to Thermal, Light and Sound Energy Chlorophyll green chemical that plants use for photosynthesis chloroplast structure in plant cells where photosynthesis happens contact force e.g car wheels on the road, hitting a ball with a bat, feet pushing The ground when you walk. Electrical Energy energy of moving electrons

4 electrical force a force that pulls charged objects Electrical to Thermal and Light Energy Electrical to Thermal Energy energy the ability to do work force a push or a pull

5 Force push or pull; causes objects to move forces forces can have a negative effect. friction E.g: Car wheels on road. Rockets. Heaps of stuff :) E.g: Car crash, falling off a cliff, clobbered in head by flying ball. A force that resists motion gravitational force The force of attraction between all masses in the universe. gravitational force an attractive force that acts between any two objects

6 Gravity a force that moves rocks and other materials downhill; the force that pulls objects toward each other Gravity is a pulling force inclined plane kinetic energy energy an object has due to its motion; KE=1/2 mv^2 (Joules).

7 Law of Conservation of Energy energy can neither be created nor destroyed; energy just changes form Leaves The part of a plant where most photosynthesis takes place. light energy magnetic force The attraction or repulsion between magnetic poles.

8 Mass the property of a body that causes it to have weight in a gravitational field mechanical energy Newton energy in an object due to its motion or position, or both; sum of kinetic and potential energy in an object that is used to do work; ME=PE+KE (Joules). Unit of measurement for force non-contact forces Gravity, magnetism. Nuclear Energy the energy locked in the nucleus of an atom Nuclear to Electrical Energy

9 particle a very small piece of matter Photosynthesis The process in which organisms use water along with sunlight and carbon dioxide to make their own food. Plants use the sun's energy to convert water and carbon dioxide into sugars Photosynthesis 6 CO₂ + 6 H₂O C₆H₁₂O₆ + 6 O₂ The chemical reaction which converts radiant energy into chemical energy in producers. plants Living things that are producers. They produce food through photosynthesis. They take in carbon dioxide and release oxygen.

10 potential energy energy an object has based on its position, shape, or condition; stored energy; PE=mgh (Joules). radiant energy solar or heat energy which travels in waves Radiant Energy Solar Energy sound energy What forms of energy: S.E.

11 spring force The force exerted by a compressed or stretched spring upon any object that is attached to it. thermal energy heat energy thermal energy What forms of energy: H.E. unbalanced force Forces acting on one object that cause a change in motion. units that measure mass Kilograms, or grams. weight A measure of the force of gravity on an object What would happen to living organisms if there is no energy? Where do we get the energy from? The living things will die the food we eat

12 Why are plants green? Because they reflect green light and absorb red and blue light Work force exerted on an object that causes the object to move in same direction that the force was applied Work

13 Inclined Plane Work = Force x Distance