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Forces Level 1
All the terms you need to know for Level 1 of the Forces Menu
Question | Answer |
---|---|
force | a push or a pull |
magnetism | a force that can attract (pull towards) or repel (push away) that exists with many metal objects |
buoyancy | an upward force exerted by a liquid or gas. it helps boats float. |
gravity | an attractive force between ALL objects in the universe. it changes depending on distance and mass of the objects. (larger = stronger, farther away = weaker) |
mass | the amount of matter (or stuff, or atoms) in an object. it is constant even if gravity changes. |
weight | a measurement of how much gravity pulls on a certain amount of mass. it changes depending on gravity. |
friction | a force between objects that touch, which opposes (goes against) motion. it also generates heat. it can be reduced with wax or oil or grease. |
spring balance (spring scale) | a scientific device for measuring force. |
Newtons | the units for measuring force. |
attract | when objects pull toward each other. |
repel | when objects push away from each other |
electricity | a force caused by moving electrons (current) or by build-up of charges (static electricity). |
atomic force | the force that holds atoms (all matter) together, and also holds protons and neutrons and electrons together within atoms. |
elasticity | a force that pulls springy objects back to their original shape after you let them go. |
balanced forces | these are equal AND opposite (direction) forces, where there is no change in motion (no acceleration, speed stays same or no movement at all) |
unbalanced forces | forces are unequal, or the direction of the forces is not opposite. the motion will change (speed up or slow down or start moving or stop moving). |