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Balancing Forces - 3
Unit 1
| Question | Answer |
|---|---|
| attract | to pull on an object, even without touching it |
| balanced forces | forces that are equal in strength and opposite in direction - no movement happens |
| force | a push or pull |
| diagram | an illustration that shows how something works |
| exert | to cause a force to act on an object |
| gravity | the force that pulls objects toward Earth |
| magnet | an object that pulls on some kinds of metal and pushes an pulls on other magnets, even without touching them |
| magnetic force | a non-touching force that can push or pull certain objects |
| non-touching force | a force that acts on an object without touching it (like gravity or magnetism |
| repel | to push away |
| touching force | a force that acts between objects that are touching each other |
| unbalanced forces | force that is not equal- cause movement or a change in motion |
| electromagnet | a kind of magnet that can be turned on and off with electricity |
| engineer | a person who uses science knowledge to design and build things to solve problems |
| Objects fall to Earth because _____. | gravity pulls them downward |
| _____ always pulls objects to the center of Earth. | gravity |
| If forces are _____, the object does not move. | balanced |
| If forces are _____, the object starts to move or changes speed or direction. | unbalances |
| A magnet can ___ (pull toward) or ___ (push away) other magnets. | attract, repel |
| _______ can move things without touching them - this is called a _____ _____. | Magnets non-touching force |
| ___ ___ is the push or pull between two magnets or between a magnet and certain metals. | magnetic force |
| The train floats because ___ ___ pushes it upward while ___ pulls it down. | magnetic force gravity |
| The train floats when forces are ___, and falls when magnetic force ___or gravity becomes ___. | balanced weakens stronger |
| What force pulls objects toward Earth? | gravity |
| What happens when two equal forces act on an object in opposite directions? | They are balances; the object does not move |
| What happens when one force is stronger than another? | The forces are unbalanced, and the object moves |
| What is an electromagnet? | A magnet uses electricity and can be turned on and off. |
| Why does the train rise without touching anything? | because magnetic forces push it upward |
| What two forces make the train float? | Gravity and magnetic force |
| Why does the train go from floating to falling? | because the magnetic force weakens or gravity becomes stronger, making the forces unbalanced |
Created by:
lstevens3
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