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26 Cards in this Set
- Front
- Back
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Gravitational force |
Causes objects to accelerate downwards (towards earth's core) |
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Normal force |
Perpendicular to surface an object rests on |
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Mass |
Amount of matter an object is made of |
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Newton's first law |
Objects keep doing what they are doing unless an external force acts upon it |
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Newton's second law |
An external force causes it to accelerate in that direction - connects acceleration, net force and mass - more mass less acceleration - more force more acceleration |
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Inertia |
Object resistance to change in motion |
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Applied force |
A force that results when one object makes contact with another and pushes or pulls on it |
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System diagram |
Simple sketch of all objects involved in a situation |
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FBD |
Simple drawing of an object showing all the forces that are acting on it |
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Tension |
Pulling force from a rope or string on an object always points toward the rope or string |
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Friction |
Opposes the sliding of two surfaces across one another Acts opposite to the motion or attempted motion |
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What are the four fundamental forces |
Gravitational, electro magnet, strong nuclear, weak nuclear |
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Newton's third law |
For every action force, there is a reaction force that is equal in magnitude but opposite in direction |
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Equation for a |
A = v2-v1/t |
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Force of gravity (fundamental force) |
- pulls objects down towards the earth's centre - exists between any two losses in the universe - keeps the moon in orbit around Earth and earth in orbit around the Sun - Fg= mg (g= 9.8) |
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Strong nuclear force |
Force of attraction between neutrons and protons keep positively charged protons from repelling each other |
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Electromagnetic force |
Caused by electric charges - exists between charges, and magnetic forces exist between magnets - holds atoms in molecules together |
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Weak nuclear force |
Interactions involved during particle transformations |
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Dynamics |
Explains why objects move the way they do |
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What does the graph of net force vs acceleration represent |
If it is linear, the slope represents the mass |
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What is the difference between mass and weight |
Mass of the quantity of matter in an object. To change the mass of an object, you need to add or remove matter. the mass of an object does not change due to location or changes in gravitational field strength. Weight is a measure of the force of gravity acting on an object. the weight of an object depends on the location and the magnitude of Earth's gravitational field strength at that location. |
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Static friction |
Force exerted on a stationary object by a surface that prevents the object from starting to move - applied force must be greater then static friction to cause a stationary object to move |
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Kinetic friction |
Force exerted on a moving object by a surface, and acts opposite to the direction of motion of the object. |
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Coefficient of friction |
Ratio of the of the force of friction to the normal force U= Ff/FN |
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Coefficient of static friction |
Ratio of the maximum force of static friction to the normal force US= FsMax/ FN |
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Coefficient of kinetic friction |
Ratio of kinetic friction to the normal force UK= Fk/FN |
