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12 Cards in this Set
- Front
- Back
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force |
- vector quantity - causes an object to start, stop, change direction, change shape, change size, change speed - SI unit: newton (N) - measured by spring balance |
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contact forces |
physical contact between 2 objects |
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non-contact forces |
between disconnected objects due to fields |
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net force |
- occurs when an object is acted on by >1 force - AKA resultant force - forces acting parallel to each other can be found by looking at the free body diagram - forces not acting parallel to each other can be found using the vector drawing - Fnet = 0 when all forces are balanced - Fnet does not = 0 when forces are unbalanced |
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friction |
static friction - more than applied force - dependent on surface
kinetic friction - applied friction |
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air resistance |
- faster the object, greater the air resistance - greater surface area, greater air resistance - when falling, air will increase until equal to weight |
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newton's 1st law of motion |
an object will continue in its state of rest/uniform motion unless an external unbalanced force acts upon it
- law of inertia - at rest/in equilibrium - forces are balanced so no net force |
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law of inertia |
reluctance of a body to change its rest/motion
greater mass, greater inertia |
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newton's 2nd law of motion |
when a net force acts on a moving object, it will accelerate in the direction of the force applied
- forces are not balanced so there is net force - net force = mass X acceleration |
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newton's 3rd law of motion |
for every action, there is an equal & opposite reaction on mutually opposite bodies - equal in magnitude - opposite in direction - same type of force - same magnitude |
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mass |
- amount of matter - scalar quantity - independent of strength of gravity |
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weight |
- amount of force due to gravity - vector quantity - dependent on strength of gravity |
