Definitions (words) - Unit 1

Flashcards by Tech Wilkinson, updated more than 1 year ago
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OCR Physics Unit 1 - Mechanics

Resource summary

 Question Answer Power Rate of doing work Power one watt (W) is equal to one joule per second Hooke's Law The extension of a material is directly proportional to the force extending it plastic behaviour a material which does not return to its original length when an extending force is removed - it is permanently distorted elastic behaviour material which returns to its original length when an extending force is removed Global Positioning System using trilateration between three salellites to position the car on the fourth surface (fourth plane). Using a microwave signal sent from the satellite, the in-car GPS is able to work out the distance between itself and the satellite (using distance = speed of light * time). This is repeated for the other salellites and the point the three spheres intercept, along with the surface of the earth, is the location of the car. Tensile forces forces stretching an object - causing tension compressive forces forces compressing the object work done 1J is the work done when an object is moved 1m in the direction of a 1N force ductile material with a large plastic region in its behaviour brittle material which shows not elastic behaviour - breaks before it reaches its elastic limit polymeric degree of strain can reach up to 300% (unlike ductile ~~50%) stress the force per unit ctoss-sectional area strain the extension pre unit legnth

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