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Physical Sci Ch4
Unit Test voc included
| Question | Answer |
|---|---|
| is force applied through a distance. | Work |
| is a device that changes the force or increases the motion from work. | Machine |
| is a machine that does work with only one movement of the machine. | Simple Machine |
| is a combination of two or more simple machines. | Compound Machine |
| is the ratio of output work to input work. | Efficiency |
| is the ratio of the output force to input force. | Mechanical Advantages |
| is the ability to cause change. | Energy |
| is anything around which you can imagine a boundary. | System |
| is energy due to motion. | Kinetic Energy |
| is energy that is stored due to the interactions between objects. | Potential Energy |
| is energy that is stored by compressing or stretching an object. | Elastic Potential Energy |
| is energy that is due to chemical bonds. | Chemical Potential Energy |
| is energy that is due to the gravitational forces between objects. | Gravitational Potential Energy |
| states that energy cannot be created or destroyed. | Law of Conservation of Energy |
| is the sum of the kinetic and potential energy of the objects in a system. | Mechanical Energy |
| is the rate at which energy is converted. | Power |
| Thermal Energy is measured in _____. | Jules |
| The law of_____states that energy in a system can change forms but can never be created or destroyed. | Conservation of Energy |
| The______energy of an object with height. | Potential |
| The mechanical energy of a coconut falling from a tree_____. | is constant |
| Mechanical energy is the total kinetic and_____energies in a system. | Potential |
| _____can cause kinetic energy to change into thermal energy. | Friction |
| Green plants convert light energy from the sun into_____. | Chemical Energy |
| MxGxH= | GPE |
| 1/2MxV(squared)= | KE |
| 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? | 5x9.8x2= 98 Jules |
| 2.) What is the potential energy on the truck? | 5x9.8x1.5=73.5 Jules |
| 3.) What is the wood's kinetic energy during the delivery? | ½5x10=25 Jules |
| 4.) If the wood drops from the carpenter shoulder what would its maximum kinetic energy be? | ½ 5x9.8=24.5 J |
| 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. | Truck is going faster and it has more kinetic energy. |
Created by:
P.V.A.
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