# Physics, P3

Flashcards by mimiblue890, updated more than 1 year ago
 Created by mimiblue890 over 6 years ago
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### Description

Flashcards on Physics, P3, created by mimiblue890 on 12/29/2014.

## Resource summary

 Question Answer WHAT ARE THE FORMULAS FOR DISTANCE SPEED AND TIME? Average speed= distance -------------- time WHAT IS THE FORMULA FOR ACCELERATION? FORMULA FOR FORCE? Mass x Acceleration WHAT 4 THINGS EFFECT REACTION TIME? -Tiredness -Alcohol or other drugs -travelling fast -distraction or lack of ceoncentration WHAT THREE FACTORS WILL BREAKING DISTANCE TO INCREASE? -Poor road conditions(e.g. icy) -Car not properly maintained(e.g. worn brakes) -A high speed TO PREVENT ACCIDENTS, WHAT THREE FACTORS ARE USED TO MAINTAIN SAFE STOPPING? -Keep appropriate distance from car in front -different speed limits for different types of roads -slow down when road conditions are poor FORMULA FOR WORK DONE? Work done= force x distance moved WHAT IS THE FORMULA FOR WEIGHT? Weight= mass x gravitational field strength HOW MANY NEWTONS OF FORCE ARE THERE ON EARTH PER 1KG? 10N FORMULA FOR POWER? Power= Work done ------------------ Time taken FORMULA FOR KINETIC ENERGY? 2 Kinetic energy= 1 x m x v ---- 2 HOW CAN FORCE BE REDUCED BY ACCELERATION? -Increasing stopping or collision time -increasing stopping or collision distance WHAT 4 FEATURES DOES A CAR HAVE THAT ABSORBS ENERGY WHEN IT STOPS SUDDENLY? -Brakes get hot -CRUMPLE ZONES that change shape -SEAT BELTS that stretch a little -airbags that inflate and squash WHAT IS A CRUMPLE ZONE? Areas of a car that absorb energy of a crash to protect the center or the vehicle HOW DO YOU FIND THE KINETIC ENERGY LOST? Kinetic energy lost= WORK DONE by the breaks WHY DO SOME PEOPLE NOT WEAR SEAT BELTS? -There is a risk of chest injury -they may be trapped in an event of a fire -drivers may be encouraged to drive less carefully because they know they have protection from the seat belt FORMULA FOR MOMENTUM? Momentum= mass x velocity WHAT TWO THINGS DOES THE AIR RESISTANCE FORCE DEPEND ON? -The area (the larger the area, the greater the air resistance) -speed (the faster the object falls, the greater the air resistance HOW DO YOU WORK OUT THE STOPPING DISTANCE? Stopping distance= thinking distance + braking distance HOW DO YOU WORK OUT THINKING DISTANCE? Thinking distance= speed x reaction time DISADVANTAGES OF USING FOSSIL FUELS? -Non-renewable source -produces green house gas pollution (co2) -acid rain produced by pollutants ADVANTAGES OF BIO FUEL OR SOLAR POWERED VEHICLES? -Does not produce pollution when being driven -Improving air quality in towns and cities -quiet -If the electricity used to recharge it is renewable (wind or solar) then it would be non polluting at all DISADVANTAGES OF BIO FUELED CARS? -It is often charged using a non renewable source of electricity so it still affects the environment -Takes a lot longer to charge that fossil fueled cars Weight, Friction, reaction(support) and Power/Thrust HOW DO YOU FIND THE CHANGE IN GRAVITATIONAL POTENTIAL ENERGY? Change in gravitational potential energy= mass x gravity x change in height

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