Motion and Forces
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34 terms
Terms | Definitions |
|---|---|
 Force | a push or a pull |
| Net Force | the force after the counteracting force |
| Unbalanced force | whenever there is a net force acting on an object |
| Balanced Force | equal forces acting on one object in opposite directions |
| motion | object is in motion if its distance from another object is changing |
| inertia | the tendency of an object to resist a change in motion or stay still |
| Mass | a measure of the amount of matter in an object |
| Newton (the unit) | The unit that measures the strength of a force (1 km in mass at 1 mile per second) |
| Friction | the force that two surfaces exert on each other when they rub against each other |
| Sliding Friction | when two solid surfaces slide over each other |
| rolling friction | when an object rolls over a surface |
| fluid friction | when a solid object moves through a fluid |
| gravity | a force that pulls object towards each other |
| weight | the force an object exerts on something toward the earth |
| momentum | is a characteristic of a moving object that is related to the Mass and the Velocity of the objects |
| terminal velocity | final speed |
| Law of conservation of momentum | in the absence of outside forces, the total momentum of the object that hit each other does not change |
| centripetal force | any force that causes an object to go in a circle |
| theory of plate tectonics | earth's land masses have changed position over time because they are part of plates that are moving slowly |
| Frame of reference point | A place or object used for comparison to determine if an object is in motion |
| Acceleration and deacceleration | increasing speed or decreasing speed or changing direction |
| Satellite | any object that orbits another object in space |
| Velocity | speed and direction |
| Speed | distance/time |
| Velocity | the speed and direction of an object's motion |
| Acceleration | SF-SI/time or force/mass |
| momentum | mass*velocity |
| Control Group | what you compare |
| Experimental Group | what you base the experiment on |
| Independent variable | what you change in an experiment |
| Dependent Variable | What you measure (measurements) |
| Newton's 1st Law of Motion | Objects at rest will remain at rest unless acted upon by an outside force.Objects in motion will remain in motion at the same velocity unless acted upon by an outside force. |
| Newton's 2nd Law of Motion | A=force/mass |
| Newton's 3rd Law of Motion | To every action there is an opposite and equal reaction. |
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