One joule (J) divided by (/) one second (s) work-energy theorem net work (Wnet) done on the system equals (=) change in kinetic energy (delta KE) example of the work-energy theorem pushing a cart net work (Wnet) increases when the speed increases net work (Wnet) decreases when the speed decreases net work (Wnet) equals (=) 0 when the speed stays constant change in kinetic energy (delta KE) equals (=) 1/2 mass (m) times (x) velocity squared (v^2) power (P) equals (=) work (w) divided by (/) time (t) one watt equals (=) one joule (J) divided by (/) one second (s) units for power (P) watt ![]() When it travels as fast on the moon, it its momentum more, less, or the same? the same Why does a baseball catcher's mit have more padding that a conventional glove? to increase time of contact energy the capacity to do work the two types of mechanical energy kinetic and potential kinetic energy energy of motion example of kinetic energy the mini-cart moving (class presentation) potential energy energy of position example of potential energy the mini-cart stopped, looking towards the floor kinetic energy (KE) equals (=) 1/2 mass (m) times (x) velocity squared (v^2) unit for kinetic energy (KE) joules (J) potential energy (PE) equals (=) mass (m) times (x) acceleration of gravity (g) times (x) height (h) which equals (=) work (w) times (x) height (h) one joule (J) equals (=) one Newton (N) times (x) one meter (m) work (W) the transformation of energy work (W) equals (=) force (F) times (x) distance (d) What is the reason for different values on different surfaces? the time of contact A lunar vehicle is tested on Earth at a speed of 10 km/hr. ![]() ![]() Examples of elastic collision cue ball hitting another ball in pool shuffle board objects bouncing off each other a pendulum inelastic collision only momentum is conserved examples of inelastic collision a football tackle where both players go down at the same speed trains hooking up shuffle board objects sticking together throwing gum on someone effects of bouncing when a ball keeps bouncing, the impulse decreases when a tennis ball bounces off a yoga ball, the tennis ball's impulse increases In terms of impulse and momentum, why do padded dashboards make automobiles safer? because of the increase in time of contact A person can survive a feet first impact at a speed of 12 m/s on concrete, 15 m/s on soil, and 34 m/s on water.
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