F=ma – mass on string
https://serc.carleton.edu/dmvideos/players/cart_accelerate.html?hide_banner=true
F=ma – mass on string
https://serc.carleton.edu/dmvideos/players/cart_accelerate.html?hide_banner=true
Acceleration – mass on pulley
http://s3-us-west-2.amazonaws.com/dmvideos.org/players/nsl_2_einstein/nsl_2_einstein.html
Apparent weight
See forces on object in elevator
http://www.physicsclassroom.com/Physics-Interactives/Newtons-Laws/Elevator-Ride
Force, mass, acceleration