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Chapter 9 Energy notes 9.1 Work Work is done when a force _______ causes an object to ____________. The force must act against _________________ or __________________. The motion has to be the same ___________________ as the force. Is the female walking up the stairs a force against friction or against gravity? Write an example of a force against gravity and against friction. The equation for work is ______________ The unit of work is Newton-meters or Nm is called ______________________. 9.2 Power Power is the _____________ at which work is done. Power is ______________ divided by ________________. The formula for power is __________________. The unit for power is joules per second j/s or _____________________. 100 watts equals 1 __________________. 9.3 Energy Energy is the ability to do ______________________________. There are many different forms of Energy. 1. 2. 3. 4. 5. 6. _________________________________________________ _________________________________________________ _________________________________________________ _________________________________________________ _________________________________________________ _________________________________________________ 9.4 Potential Energy Potential energy is _________________ due to an objectâ€™s __________________________. A. Elastic energy is stored in something that is stretched or compressed. Examples _________________________________________________________________. B. Chemical energy is stored in bonds between atoms. Examples _________________________________________________________________. C. Gravitational is the energy of an elevated (raised up high) object. Examples _________________________________________________________________. The equation for gravitational potential energy is GPE=mgp The unit for GPE is ______________ 9.5 Kinetic Energy Kinetic energy is the energy of _______________________. The equation for Kinetic Energy is KE =1/2 mv2 The unit for KE is _________________________. Kinetic Energy depends on the velocity squared, so if the speed of an object doubles(x2) energy _____________________ (x4) 9.6 Work energy theorem and d 9.7 The Law of Conservation of Energy The work energy theorem states that when _______ is done, then _____________changes. The law of conservation of energy states that ________ cannot be created or destroyed, it can only be ______________________. This means that the sum of __________________ ________________________ remains constant for a closed system. Examples