The APsolute RecAP: Physics 1 Edition is a guided review through all ten units of classical mechanics. Areas of focus include kinematics, motion, energy, momentum, electricity and sound. Plus, a thorough review of essential math skills and graphing analysis through practical examples! Make sure to subscribe wherever you get podcasts, download the accompanying study guides for extra practice, and follow along on social media for the question of the day and course updates! The 2021 exam is on Wednesday, May 5th.
https://the-apsolute-recap-physics-1-edition.simplecast.com
episode 13: The APsolute RecAP: Physics 1 Edition - Energy and Work
Episode 13 explains why the law of conservation of energy is better stated as “the total mechanical energy of a system is conserved unless net external work is applied to the system.” Beginning with an explanation of mechanical energy (1:51) before skating into two practice problems (3:08). Energy is conserved unless there is net external work (7:07). Don’t forget that work can be negative too if it takes energy away from a system. (9:03) The episode concludes with an introduction to power (10:19).
The Question of the Day asks: (11:16)
A frictionless lab cart is released from rest on a ramp from vertical height “h” and a ball is dropped from rest at the same vertical height. Which is moving faster the moment before impacting the ground?
a) the cart
b) the ball
c) they are moving with the same speed
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