# Physics

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what is meant by the term 'velocity?'
Speed in a given direction
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What are the 6 safety features in cars?
Seat belts, ABS (advanced braking system), crumple zones, air bags, safety cage and side impact
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What is a 'resultant force?
The force that is created by someone/somethings action
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What if there is not resultant force?
There is no change in velocity
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There is only one thing that effects thinking distance and braking distance. What is it?
Speed
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Fill in the gaps; The _______ the _______ area the faster the speed
The SMALLER the SURFACE area the faster the speed.
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Fill in the gaps; When certain __________ materials are rubber against each other they become ____________ charged
When certain INSULATING materials are rubbed against each other they become ELECTRICALLY charged.
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Does the material that gains electrons become negatively charged, have an equal positive charge or positively charged? and does the material that looses electrons become negative, equally positively charged or positively charged?
Negatively. an equal positive charge
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Fill in the gaps; Two objects that carry the same type of charge _____ each other and two objects that carry different types of charge _____ each other.
Repel, attract
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Explain what a fixed resistor is.
They only have one job. can't change its values. always gives the same current unit.
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Explain what a variable resistor is.
Anything with a dial to give more/less power. value is changed by turning dial.used in dimmer switched and volume controls.
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Explain what a light dependent resistor is.
(LDR) change with the light level. bright light-low resistance and more current. used in ?auto-brightness' systems.respond quickly
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Explain what a thermistor is.
Change with temp. hotter- lower resistance and are current. used in thermostats. don't respond instantly as have to warm up first
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Fill in the gaps; LDR's and thermistors are both ________ __-________ devices
NEGATIVE CO-EFFICENT
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How do you calculate the resistance using Ohm's law?
Resistance= voltage divided by current
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How do you calculate the current using Ohm's law?
current= voltage (pd) divided by resistance
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How do you calculate the pd (voltage) using Ohm's law?
pd (voltage)= current X resistance
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Fill in the gaps; ___ skin has a much lower resistance than ___ skin. Therefore more _______ can flow through your body if your skin is ___.
wet, dry,current,wet
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## Other cards in this set

### Card 2

#### Front

Seat belts, ABS (advanced braking system), crumple zones, air bags, safety cage and side impact

#### Back

What are the 6 safety features in cars?

### Card 3

#### Front

The force that is created by someone/somethings action

### Card 4

#### Front

There is no change in velocity

Speed