Forces & Newton's Laws
Free-body diagrams, Newton's three laws, friction, springs, pulleys and what changes inside an accelerating lift or train.
Problems
- Distance in Six Seconds
- What Holds Up the Top Two Books?
- Net Force on the Middle Book
- Force from a Velocity Graph
- A Lighter Lift
- Lifting a Block
- Force from a Speed Change
- Books in a Rising Elevator
- Speed After Two Seconds
- Pull, Then Let Go
- Work Done by the Force
- Pushing Down in a Rising Elevator
- Equal Masses
- Friction Between Stacked Blocks
- A Heavier Lower Block
- How Fast Does A Speed Up?
- One Spring, One Mass
- Unequal Masses on Two Springs
- Two Springs, Two Masses
- Two Springs in a Rising Elevator
- Atwood Machine
- A Block Dragged by a Falling Weight
- Balanced Pulleys
- A Frictionless Table
- A Lopsided Atwood Machine
- Two Blocks and One Spring
- Pulling Against a Hanging Block
- Tension in an Atwood Machine
- A Movable Pulley
- Three Bodies, Two Pulleys
- Equal Stretches, Different Springs
- Tension While Pulling
- Tension on C's Side
- Tension in the Cord
- Force in the Second Spring
- Pulling from the Other End
- The Heavier Block Wins
- Just Enough Friction
- Speed at the Floor
- How Hard to Pull?
- Pendulum in an Accelerating Train
- A Spring in a Rising Elevator
- The Elevator at Rest
- A 45° Tilt
- How Far Does It Tilt?
- Accelerating Downward
- Tension in the Tilted String
- Reading the Elevator's Acceleration