Physics Final
About this set
Created by:
sabgirl101 on December 5, 2010
Subjects:
science 7, science vocabulary, science
Description:
This covers:
Relative position & motion, speed and velocity, acceleration, newton's laws of motion, types of forces, systems of forces, and pressure.
Order by
34 terms
Terms | Definitions |
|---|---|
 Relative Position, Accurate or Precise? | The location of an object in relation to the position of another object, Accurate. |
| Vector | A measurement incorporating size and direction. |
| Coordinate System, Accurate or Precise? | The determination of location based on a numbered grid, Precise. |
| Speed | A measure of how fast something moves through a particular distance over a definite time period. |
| Average Speed | A measure of the distance traveled in a given period of time. |
| Instantaneous Speed | Speed at a particular instant in time. |
| How can you find speed if you're given distance and time? | Distance divided by time. |
| How can you find distance if you're given speed and time? | Speed multiplied by time. |
| How can you find time if you're given speed and distance? | Distance divided by speed. |
| Velocity | A speed in a specific direction. |
| Acceleration | The rate at which an object's velocity changes with time. |
| How can you calculate acceleration? | Final Velocity minus Initial Velocity divided by Time. |
| What is the Acceleration Constant on Earth? | 9.8 m/s squared. |
| Newton's 1st Law of Motion | An object at rest will stay at rest and an object in motion will stay in motion unless acted upon by an unbalanced force. |
| Newton's 2nd Law of Motion | Force is equal to an object's mass multiplied by its acceleration. |
| Newton's 3rd Law of Motion | For every action there is an equal and opposite reaction. |
| How can you find force if you're given mass and acceleration? | Mass multiplied by acceleration. |
| How can you find mass if you're given force and acceleration? | Force divided by acceleration. |
| How can you find acceleration if you're given mass and force? | Force divided by mass. |
| Gravity | Force that causes attraction between masses. |
| According to Newton, what two factors influence gravitational attraction between two objects? | Proximity and Mass. |
| How can you calculate the weight of an object? | Mass (kg) multiplied by acceleration due to gravity. |
| Contact Force | Force between two objects; a push or a pull. |
| Acceleration in the same direction to motion causes an object to: | Speed up. |
| Acceleration in an opposite direction to motion causes an object to: | Stop, slow down, or reverse direction. |
| Acceleration in the an angle to motion causes a: | Change in direction. |
| Friction | The resistance between objects moving against each other. |
| Factors that influence friction: | Pressure, Surface Area, and Type of Surface. |
| Air Resistance | The fluid friction due to air. An object with greater surface area will encounter increased air resistance. There is a direct relationship between velocity and air resistance. |
| Net Force | The directional sum of all forces acting on an object. |
| Balanced Forces | Equal forces acting against each other resulting in no motion. |
| Unbalanced Forces | Unequal forces acting against each other resulting in motion. |
| Pressure | A measure of how much force is acting on a certain area. |
| How can you calculate the pressure that an object exerts on a surface? | Force (N) divided by Area (m squared) |
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