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SFS science final
stack 1
| Question | Answer |
|---|---|
| amount of ---- in an object | matter |
| a push or pull | force |
| when an object speeds up, slows, down. or turns | acceleration |
| tendency of an object to resist a change in its motion | intertia |
| a measure of how difficult it is to stop a moving object | momentum |
| the SI metric unit of force and weight | newton |
| represents force in science | arrows |
| unequal force = movement + occurs | unbalanced force |
| equal forces - no movement | force |
| acceleration = (sf - si) time | acceleration formula |
| What does acceleration change? | direction and speed |
| What does momentum measure? | how hard it is to stop an object |
| when your speed decreases Ex. when your speed changes from 10 mph to 6mph | negative acceleration |
| Explain how mass and weight are affected when you travel to the moon? | Mass is constant and weight changes because there is less gravity on the moon |
| a = sf + sli t | word problems - acceleration |
| evidence of the pull of gravity between the moon and the earth (rise and fall of water) | tides |
| a truck and a bicycle have the same momentum. which one would be harder to stop? | the truck because the mass and inertia are greater |
| list 3 examples of forces that cannot be seen | magnetic, electric, gravity |
| to have momentum what must an object be doing | moving |
| 3 ways to accelerate | speed up, slow down, change direction |