Contact Force, A force that acts when an object is in contact with a surface, air, or water, Friction, The force that resists movement because of contact between surfaces, Air resistance , The force on an object moving through the air that causes it to slow down(also known as drag)., Gravity ​, A non-contact force that acts between two masses., Non-contact force, A magnetic, electrostatic, or gravitational force that acts between objects not in contact, Deform , To change shape, Compress​, To squash into a smaller space, Stretch, An object can be stretched if you exert a force on it., Extension , The amount by which an object gets longer when a force is applied, Elastic limit, The point beyond which a spring will not return to its original length when the force is removed., Hooke's Law​, A law that says if you double the force on an object the extension will double, Lubrication , A substance that reduces friction between surfaces when they rub together, Water resistance , The force of an object moving through water that causes it to slow down (also known as drag), Streamlined, Shape to reduce resistance to motion from air or water, Magnetic force, The force between two magnets, or a magnet and a magnetic material, Electrostatic forces, The force acting between two charged objects, Weight, The force of the Earth on an object due to its mass.

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