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| Any push or pull on an object. |
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| The overall force on an object. Forces in the same direction add, forces in opposite directions subtract. |
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| A net force of zero (all forces cancel out) that does not cause an object to accelerate. |
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| A non-zero net force (one force is stronger) that causes an object to accelerate. |
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| Shows all the forces acting on an object with arrows where the length of the arrow represents the strength. |
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A force that keeps objects in motion.
Depends on mass (more m = more P)
Depends on velocity (more v = more P) |
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| Isaac Newton's laws that described all motion of objects. |
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| Objects in motion stay in motion, objects at rest stay at rest, unless acted on by an unbalanced force. |
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F=ma
The acceleration of an object depends on the mass and net force. The greater the force, the greater the acceleration. The greater the mass, the less the acceleration. |
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| Forces come in pairs. For every action, there is an equal and opposite reaction. |
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| Force of attraction between two objects. |
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| Law of Universal Gravitation |
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| The force of gravity acts between all objects in the universe. The larger the masses, the greater the force. The closer the masses are the greater the force. |
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| The only force acting on an object is gravity (unbalanced = acceleration). In the absence of air, all objects fall at the same rate. |
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| When the downwards force of gravity is balanced by the upward force of air resistance, the stops accelerating and moves at a constant (maximum) speed. Depends on velocity, surface area, and mass. |
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| The motion of a projectile (a throws object) is both horizontal and vertical. Two objects (1 dropped vertically, 1 thrown horizontally) will reach the ground at the same time. |
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| Force that opposes motion and causes an object to slow down. |
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| Friction between moving objects. |
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| Friction between stationary objects. |
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| A kinetic friction that occurs between two surfaces that slide past each other. |
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| A kinetic friction that occurs between a surface and a rolling object. |
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| A kinetic friction that occurs between a surface and a fluid (liquid or gas). |
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