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27 Cards in this Set
- Front
- Back
- 3rd side (hint)
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Forces |
A push or pull |
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Net force |
The combination of all forces acting on an object |
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Unbalanced forces |
Result in a net force and cause a change in the objects velocity |
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Balanced forces |
Equal forces acting on one object in opposite directions, do not change the objects velocity |
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Friction |
Force that 2 surfaces exert on each other when they rub against each other |
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Static friction |
Acts on objects that are not moving, acts in opposite direction to intended motion |
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Sliding friction |
When 2 solid surfaces slide over each other |
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Rolling friction |
When an object rolls across a surface |
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Fluid friction |
Occurs when a solid object moves through a fluid, like liquids and gases |
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Gravity |
A force that pulls objects toward each other |
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Universal law of gravitation |
The force of gravity acts between all objects in the universe |
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Weight |
Weight=mass•acceleration |
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Free fall |
The only force acting on an object is gravity |
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Air resistance |
Fluid friction, acts on objects falling through the air. Falling objects with a greater surface area experience more air resistance |
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Elastic forces |
Matter is considered elastic if it returns to its original shape after it is squeezed or stretched |
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Compression |
Elastic force that squeezes or pushes matter together. |
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Tension |
Elastic force that stretches or pull matter |
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Newton's first law of motion |
An object will remain at rest or moving at a constant velocity unless it is acted upon by an unbalanced force |
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Inertia |
The tendency of an object to resist a change motion |
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Newton's Second law of motion |
Acceleration depends on the net force acting on the object and the mass of the object F=m•a |
F -------- M|A |
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Newton's third law of motion |
If one object exerts a force on another object, then the second object exerts a force of equal strength in the opposite direction on the first object |
For every action there is an equal but opposite reaction |
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Momentum |
characteristic of moving objects that depends on the mass and velocity of the object |
Momentum is in the same direction as velocity M=mv unit=kg•m/s |
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Law of conservation of momentum |
The total momentum of any group of objects remains the same, Unless outside forces act on the objects. Momentum can be transferred from one object to another but none is lost. Total momentum does not change. |
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Projectile |
Object that is thrown |
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Trajectory |
A curved path that projectiles follow. The horizontal and vertical motions act independently |
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Trajectory |
A curved path that projectiles follow. The horizontal and vertical motions act independently |
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Centripetal force |
Any force that causes an object to move in a circular path |
Acts perpendicular to the motion force |
