Unit 4 CBA review
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29 terms
Terms | Definitions |
|---|---|
 What is the formula for speed? | Speed= distance/time |
| What is average speed? | Speed/ distance |
| What is constant speed? | When the speed does not change |
| What is the difference between balanced and unbalanced forces? | Balanced forces: no movement Unbalanced forces: movement |
| True or False: A balanced force will result in an acceleration. | False |
| When an object is moving, what kind of force is acting on it? | Unbalanced force |
| What is net force? | All the forces added together, but with forces in different directions, subtract |
| What unit is used to measure force? | Newtons |
| Ilustrate 2 groups playing tug of war with one force exerting a greater force than the other. Indicate the net forces involved and the direction in which acceleration will occur. | ... |
| What 2 factors are used to determine the speed of an object? | Time and distance |
| What is velocity? What is its formula? | Speed of an object in a particular direction. Distance + direction/ time |
| What is acceleration? How do you calculate it? | Rate at which velocity changes. Final velocity - Initial velocity/ time |
| What is the unit for acceleration? | ... |
| What kind of acceleration is occurring if an object is slowing down? | Negative |
| What is the difference between speed and velocity? | Velocity has a direction, while speed is just motion |
| What is a dependent variable? | "Depends" on the independent variable. DRY mix Y- axis |
| What is an independent variable? | Goes by itself, does not depend on anything. dry MIX X- axis |
| What is initial velocity? | The velocity an object starts with |
| What is mass? What unit is used to measure it? | The amount of "stuff" inside an object. Grams |
| What is distance? What unit is used to measure it? | The space between 2 points. Meters |
| What is force? Unit? Formula? | A push or a pull. Newtons. Force = mass x acceleration |
| What is an action force? What is a reaction force? Give examples. | Action force: Force acting on an object. Ex: Push a ball. Reaction force: Result of an action force. Ex: The ball rolls. |
| What is friction? Give an example. | Force occurring then any 2 objects rub together. Ex: Rubbing hands together; friction creates heat. |
| What is gravity? How does it apply to physics? | The force holding everything down. It creates potential energy and pulls stuff down. |
| What is inertia? Which one of Newton's Laws does it apply to? | The reluctance of an object to change its state of motion. Newton's 1st law |
| What is the difference between mass and weight? | Mass is the amount of stuff inside something. Gravity is the amount gravity is pulling on the object. |
| What does Newton's 1st law state? Formula? Give an example. | An object at rest, stays at rest, an object in motion stays in motion/ the reluctance of an object to change its state of motion. No formula. Inertia. |
| What does Newton's 2nd law state? Formula? Give an example. | Force = mass x acceleration. F = m x a. A truck has more force than a golf cart. |
| What does Newton's 2rd law state? Formula? Give an example. | For every action, there is an equal and opposite reaction. No formula. Pushing a ball. |
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