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Science Unit 7

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Term
Definition
Force   a push or a pull exerted on an object; force has size and direction  
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Static friction   the force that resist the start of sliding motion between two surfaces that are contacted and at rest  
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Kinetic friction   the force that opposes the movement of two surfaces that are in contact and are moving over each other  
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Drag   a force parallel to the velocity of the flow; it opposes the direction of an aircraft and, in combination with thrust, determines the speed of the aircraft.  
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Field   any region in which a physical force has an effect  
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Net Force   the combination of all of the forces acting on an object  
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Inertia   the tendency of an object to resist a change in motion unless an outside force acts on the object  
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Gravity   a force of attraction between two objects that is due to their masses  
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Free fall   the motion of a body when only the force of gravity is acting on the body  
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Orbit   the path that a body follows as it travels around another body in space  
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Electric Charge   a fundamental property that leads to the electric magnetic interactions among particle that make up matter  
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Static electricity   electric charge at rest; generally produce by friction or induction  
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Electrical conductor   a material in which charges can move freely  
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Electrical insulator   a materiel in which charges can not move freely  
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semiconductor   an element or compound that conducts electric current better than an insulator does but not as well as a conductor does.  
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