Term
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Definition
| interaction between two objects |
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Term
| What are the four fundamental forces? |
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Definition
| gravitational, electromagnetic, strong nuclear, weak nuclear |
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Term
| All common forces are _____. |
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Definition
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Term
| The strong nuclear forces holds ____together. |
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Definition
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Term
| The weak nuclear force is the force that holds ____together. |
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Definition
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Term
| The electromagnetic force is the ____. |
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Definition
| attraction and repulsion between like and unlike objects |
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Term
| In a free body diagram, if a object is stopped or moving at a constant speed-what does that mean? |
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Definition
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Term
| What is inertia? Who came up with the principle of inertia? |
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Definition
| property of a mass to resist a change in motion; galileo |
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Term
| What is newton's first law? |
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Definition
| the law of inertia; an object at rest will remain at rest and an object in motion will remain in motion at a constant speed in a straight line unless acted on by an outside force |
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Term
| What does it mean if forces are balanced? |
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Definition
| the object is either at rest or moving at a constant speed |
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Term
| HOw do you combine forces to get a net force? |
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Definition
| if they are on the same line you can add them/subtract |
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Term
| What is the net force on a 10 N east and 15 N west? is teh object accelearting? |
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Definition
| 5 N west; yes because there is a net force |
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Term
| When can you use north east and south east? |
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Definition
| when there is a forty five degree angle |
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Term
| What is newton's second law? What is the equation that goes along with it? |
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Definition
| the law of acceleration; acceleration is directly proportional to the net force and inversly proporrtional to the mass. a=F net/m |
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Term
| you have to do tan^-1 to find theta |
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Definition
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Term
| What is the difference between mass and weight? how do you find the weight if you know the mass? how do you find the mass if you know the weight? |
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Definition
| mass is a scalar and it is the amount of matter or the amount of inertia; weight is the force of gravity, it is a vector, moves downlards, and is measured in newtons. Fw=mg |
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Term
| If a mass of 14 kg. is acted on by a force of 28 N. what is the acceleration? |
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Definition
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Term
| What determines how much friction is on an object? |
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Definition
| the normal force-the bigger the normal force, the more friction; and the surface-how smooth is it? |
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Term
| What is the coefficient of friction? What is the equation for the coefficient of friction? |
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Definition
| frictioin/normal force = coefficient of friction |
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Term
| the normal force is equal to the ____when the speed is constant or the object is at rest. |
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Definition
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Term
| If an object has a mass of 10 kg. and is pulled at a constant speed by a force of 29 N, what is the coefficient of friction? |
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Definition
| 29 N is the friction; coefficient of friction is = 29/9.8 x10 |
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Term
| What two factors affect the air resistance of a falling object? |
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Definition
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Term
| What is the terminal velocity? |
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Definition
| when the weight down equals the air resistance up |
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Term
| A falling book has a mass of 2.5 kg. The air resistance on the book is 15 N. What is the acceleration of the book? |
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Definition
| F net=24.5-15=9.5 and a=9.5/2.5=3.8 m/s squared |
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Term
| What is newton's third law? |
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Definition
| the law of interaction-for every action there is an equal and opposite reaction; there are two forces and two objects |
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Term
| What is an action-reaction pair? Why don't they cancel out? |
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Definition
| equal and opposite forces that are acting on opposite objects; do not cancel because they act on different objects |
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Term
| in action reaction do both objects move with the same speed? why? |
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Definition
| no because of the differences in mass |
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