Walkthroughs

Each problem read aloud, one formula at a time, with the part being said lit up. Press play and follow the light.

• 4.1One force, three massesF = ma, forwards and backwards
• 4.2Mass is not weightgrams, newtons, moon, slugs
• 4.3Pounds, slugs, and the moonweight in, mass out, then F = ma
• 4.4Cart on a cabletension gives a, kinematics gives t and x
• 4.5Stopping a car in thirty metresv² = v₀² + 2ax, then F = ma
• 4.6Locomotive with rolling frictionF − μN = ma, the free-body diagram
• 4.7Bullet in a barrelv² = 2ax in twenty centimetres
• 4.8Crate on a ropeT − w = ma, four tensions
• 4.9Trunk sliding to a stopa from v = v₀ + at, then F = ma
• 4.10Two masses, fastened togetherm = F/a twice, then add