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science chap 4 test
| Question | Answer |
|---|---|
| Law of Conservation of Energy | states that energy cannot be created or destroyed. |
| Potential energy | When a plant falls from a window its____ energy is transformed into kinetic energy |
| Mechanical energy | energy is the total amount of potential and kinetic energy in a system |
| thermal | a toaster uses ____energy to make toast |
| different | two copies of the same book are in a book case. One book is twice the height as the other. They have _____potential energy |
| different | a book and a feather sitting next to each other on a shelf have ___potential energies |
| Elastic Potential Energy | is energy that is stored by compressing or stretching an object |
| Chemical Potential Energy | is energy that is due to chemical bonds. |
| quadruple | doubling an object's velocity will ___ its kinetic energy |
| Joules (J) | energy(thermal energy) is measured in |
| potential | energy that is stored is ____energy |
| Friction | _____can cause kinetic/ mechanical energy to change into thermal energy. |
| potential | a rock at the edge of a cliff has ____energy because of it's position |
| Kinetic Energy | energy in the form of motion |
| mass | the greater the ___an object has the more kinetic energy it has |
| constant | The mechanical energy of a coconut falling from a tree_____. |
| chemical energy | Green plants convert light energy from the sun into_____. |
| velocity | kinetic energy of an object increases as its ____increases |
| potential energy | ___energy of an object increases with its HEIGHT |
| **work | is force applied through a distance. |
| Machine | is a device that changes the force or increases the motion from work. |
| Simple Machine | is a machine that does work with only one movement of the machine. |
| Compound Machine | is a combination of two or more simple machines. |
| Efficiency | is the ratio of output work to input work. |
| Mechanical Advantages | is the ratio of the output force to input force. |
| Energy | is the ability to cause change. |
| System | is anything around which you can imagine a boundary. |
| Gravitational Potential Energy | is energy that is due to the gravitational forces between objects. |
| Power | is the rate at which energy is converted. |
| potential | Mechanical energy is the total kinetic and_____energies in a system. |
| GPE (gravitational potential energy) | M x G x H mass x gravity x height |
| KE (kinetic energy) | 1/2 M x V squared |
| 9.8 m/s squared | average acceleration due to gravity on earth |
| 5x9.8x2= 98 Jules | 1. ) A carpenter lifts a 5kg piece of wood to his shoulder 2m above the ground. He then sits the wood on his truck at 1.5m above the ground and makes his delivery going 10m/s. 3. What is the wood's kinetic energy during the delivery? |
| 5x9.8x1.5=73.5 Jules | 2.) What is the potential energy on the truck? |
| ½5x10=25 Jules | 3.) What is the wood's kinetic energy during the delivery? |
| ½ 5x9.8=24.5 J | 4.) If the wood drops from the carpenter shoulder what would its maximum kinetic energy be? |
| Truck is going faster and it has more kinetic energy. | 5.) Why is the kinetic energy of the lumber higher on the truck during the delivery than when it drops from the carpenter's shoulder. |
Created by:
sloancaston