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SC test chap.5
science test chapter five stack
| Question | Answer |
|---|---|
| what is a reference point? | an object that appears to stay in place |
| when an object changes position over time, relative to a reference point | motion |
| What is a common reference point? | The Earth's surface |
| the distance traveled by an object divided by the time taken to travel that distance | speed |
| what is the SI unit for speed? | m/s |
| What are some others? | km/h, ft/s, and mph |
| On a graph of speed, which would be the labels? | time would be the x axis and the distance would be y |
| speed of an object in a particular direction; must include a reference point | velocity |
| When is velocity constant? | when speed and direction don't change |
| For resultant velocity, if you have two velocities in the same direction... | add them |
| if you have opposite directions... | subtract that smaller from the larger, result is direction of larger velocity |
| rate at which velocity changes | acceleration |
| what is an increase in acceleration called? | positive acceleration |
| what is a decrease in acceleratin called? | deceleration of negative acceleration |
| the faster velocity changes... | the greater the acceleration |
| what is the unot for veolicty? | m/s |
| what is the ubit for acceleration? | (m/s)/s or M/s^2 |
| what is acceleration in a circle called? ex: | centripetal acceleration, ex: windmill, or us on the Earth |
| a push or pull | force |
| what two things do forces have, and what can they change? | have size and direction, can change acceleration of an object |
| SI unit for force | newton N |
| combination of all the forces acting on an object | net force |
| how to find net force when in same direction | add them |
| how to find net force in opposite directions | subtract them, will be in direction of the larger |
| what happens when net force is 0N? | they are balanced |
| what happens when forces are unbalanced? | change in motion, speed, direction |
| a force that opposes motion between two surfaces in contact | friction |
| what does the amount of friction depend on | force pushing surfaces together and roughness of the surfaces |
| what happens when force increase? | friction increases |
| why? | hills and valleys are closer in contact |
| does changing how much surfaces are in contact affect amount of friction? | no!! |
| do heavier object exert more force/friction? | yes. |
| what does a rough surface imply | greater friction |
| what is kinetic friction? | friction between moving surfaces, can roll or slide |
| what is sliding friction? | when forces slide past each other |
| is sliding friction static or kinetic? | kinetic |
| what is rolling friction? | when an object rolls over another |
| is rolling friction static or kinetc? | kinetic |
| what is fluid friction? | between a soli object as it moves through a liquid or gas (fluid) |
| is fluid friction kinetic or static? | kinetic |
| what is static friction? | when force is applied but does not cause it to move |
| give examples of sliding friction | rubbing hands together, sledding, writing |
| give examples of rolling friction | bowling ball, skateboard, ball beraings |
| give examples of fluid friction | air around an airplane, a fish swimming in water |
| give examples of static friction | anything that isn't moving |
| you have wood, sandpaper, oil, wax, and cylinders. rate easiest to pull an object over to least easiest. | cylinders -> wax? -> oil? -> wood -> sandpaper |
Created by:
Tsarmina
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