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26 Cards in this Set
- Front
- Back
- 3rd side (hint)
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What is a force |
An objects push or pull. |
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Effects of forces |
Can cause an object to start moving, stop moving, stay in place, or rotate. |
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How is force represented |
Both size and direction by an arrow in a diagram |
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Types of forces: |
Gravitational, frictional, magnetic |
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What is a vector quantity |
Size abd direction |
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What is a scalar quantity |
Only size |
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Examples of vectors |
Force, velocity, acceleration, displacement, field strength |
.Did .Fibi .Find .Any .Vegetables |
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Examples of scalar quantities |
Speed, length, made, energy, distance |
.Maybe .Lex .Should .Eat .Dinner |
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What is density |
An objects mass per unit volune |
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How to calculate density |
Density=mass/volume |
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What is pressure |
An objects force per unit area |
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Formula for pressure |
Pressure=force/area (fpa) |
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Pressure on fluids (what affects it) |
.The depth the pressure is measured at .The density of the fluid .The gravitational field strength |
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Formula for pressure in fluids |
P=pgh |
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Any object in a liquid is acted on by what Force? |
Upthrrust |
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Where is upthurst greatest? |
At the bottim where the water is deepest and the pressure is highest |
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What is archimedes principal |
"When a body is wholly or partially submerged in a fluid upthrust equals the wright of fluid displaced" |
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Formula for apparent loss in weight |
Weight in air - weight of object in water |
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Weight of displaced fluid |
pAhg (density×volume×gravity) Mass: P×Ah |
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What is a machine |
Any device by means of which a force is applied at one point (effort) can be used to overcome a force at another point (load) |
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What is mechanical advantage |
The number of times to load moves is greater than effort applied hence the number of times a machine multiplies its efforts |
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Mechanical advantage formula |
(MA)=load/effort |
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Velocity ratio? |
Also known as the distance ratio is the number of times further the effort moves than the load |
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Velocity ratio formula |
Distance moved be effort/ Distance moved by load |
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What is efficiency? |
The ratio of useful work done by a machine to the total work out into it |
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Formula for Efficiency |
Work output/ Work input Mechanical advantage/ Velocity ratio |
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