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Forces
Unit B
Question | Answer |
---|---|
Force | can have different magnitudes, and in different directions. a vector quantity. |
Strong-force | holds the nucleus of an atom together. must be very close to be significant. strong but very short range. |
Electromagnetic-force | holds atoms and molecules together, repel if too close. Caused by electric charges, and have infinite range. |
Week-force | responsible for radioactive decay. very short range |
Force-of-gravity | attracts due to their mass, weakest of the four forces. Infinite range |
normal-force | a force that is perpendicular to this common surface |
friction | a force that acts parallel to the common surface of contact, resisting motion between the two surfaces |
field | influence on a suitable object over a region of space |
test mass | a mass too small to measurably affect the gravitational field |
weight | force of gravity acting on the object |
mass | scalar that related to the quantity of matter an object contains |
Inertia | a property that resists a change in motion such as acceleration or deceleration |
Newton's-First-Law | An object will continue either being at rest or moving at constant velocity unless acted upon by an external non zero net force. |