BTEC APPLIED SCIENCE UNIT 5 PHYSICS EXAM QUESTIONS AND ANSWERS WITH COMPLETE SOLUTIONS

BTEC APPLIED SCIENCE UNIT 5 PHYSICS EXAM QUESTIONS AND ANSWERS WITH COMPLETE SOLUTIONS Practice questions for this set Terms in this set (44) What is Hooke's Law? When a spring stretches, the extension of the spring is proportional to the force stretching it, provided the elastic limit of the spring is not exceeded. Equation for Hooke's law F=K x e What do the letters stand for in the hookes law equation F= Force in newtons (N) K=Spring constant in newtons per meter (N/m) e= Extension in meters (m) When deforming materials, what is the point called where it will no longer return to its original shape Elastic limit A spring with 10,000 n/m extends 10cm, how much force was applied? F=Ke F=10,000 x 0.1 F=1,000N Steps for working out a maths question in Physics. 1 Write out the equation 2. Substitute 3.Calculate 4.Units What is the difference between heat anf temperature Temperature - Kinetic energy of particles (Vibrating) Heat- is energy (J) What is specific heat capacity Specific heat capacity is the amount of energy needed to change the temperature of 1kg of a substance by 1 degree celcius without changing state. Units do q=mC∆T Q= Energy in JM= mass in kilograms C=Specific heat capacity∆T= Change in temperature ( degrees C) How do you work out gradient change in y/change in x What is Power? the rate at which work is done Power( W)= Energy transfer (J)/Time (S) Efficiency The efficiency of an energy transfer is the proportion of the input energy that becomes useful output energy. Efficiency= Useful energy output / total energy input terminal velocity When a object falls it must move the fluid around it. This causes an upwards drag force which acts against the movement of the object. What is Bernoulli's principle? As the flow rate of a fluid increases the pressure at right angle to thee flow decreases. Types of energy mechanical energy, electrical energy,chemical energy,nuclear energy,thermal energy Types of energy pathways EM-radiation Electric current Mechanical waves How do you transfer kelvin in to Celsius -273 How do you transfer celsius to kelvin ? +273