Systems: Two or More Bodies/3rd Law

 

Newton's Third Law

Definition, including an example of identifying action/reaction pairs.

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Action-reaction force pairs; tension in a rope; free body force diagram.

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Forces acting in systems of two or more bodies.

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Static Friction

Dynamics of an astronaut pushing a block on a surface in outer space.

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Motion Problems

Step-by-step strategy for solving motion problems. Ideal pulleys, pegs, and strings are introduced. Includes a number of motion examples.

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Forces in Equilibrium

Conditions of equilibrium for particles and rigid bodies; torque axis; center of gravity; center of mass demonstration; stable and unstable equilibrium; coupled forces; equilibrium problem-solving strategy with several examples.

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Newton's Laws

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Newton's first law defined; Newton's second law defined (F=ma); Newton's third law defined; inertial reference frames defined.

Forces acting on two blocks connected and suspended by strings. Solution not included.

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Friction

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Direction and magnitude of friction; static and kinetic friction; coefficient of friction.

Forces acting on moving and stationary blocks sitting on a surface. Solution not included.

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Springs

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Direction and magnitude of spring force; spring constant; springs in parallel and series.

Forces acting on horizontal and vertical springs. Solution not included.

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Newton's Laws of Motion

Newton's three laws of motion defined with a sentence each.

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Three Masses on Two Pulleys

Using special cases and dimensional analysis to determine which acceleration for system is correct.

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Model Airplane on a Wire

3-part problem; calculating tension in wire, critical angle, and safe speed for flight.

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Free Body Diagrams

Forces acting on systems of two or more bodies. Solution not included.

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Drawing free body diagrams for tug-of-war.

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Forces and Reference Frames

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Forces acting on a passenger in a turning car. Solution not included.

Forces acting on systems of multiple bodies. Solution not included.

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Energy and Momentum

Friction and acceleration; which forces must be known to solve for energy and momentum; kinetic energy and momentum in a collision. Solution not included.

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Strings and Blocks

Forces and accelerations acting on two blocks connected by strings.

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Cart and Pulley

Forces, including friction, acting on a cart connected to a block suspended from a pulley.

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Glass on a Tablecloth

Static friction between a glass and a tablecloth.

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Car at Rest

Comparing the gravitational force on a car and the normal force of the ground on the car. Solution not included.

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Jumping on a Scale

Forces acting on a scale with a person jumping from it. Solution not included.

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Accelerating Elevator

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Normal force exerted on a person in an accelerating elevator. Solution not included.

Forces acting on a person standing in an accelerating elevator. Solution not included.

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Friction and Surface Area

Force needed to push a crate across a floor as a function of the surface area in contact with the floor. Solution not included.

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Friction and Inclined Plane

Motion of an object sliding on an inclined surface, with friction. Solution not included.

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Friction and Tension

Tension in a rope pulling a block with friction. Solution not included.

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Cart and Hanging Weight

Tension in a string connecting a moving cart and a hanging weight via a pulley. Solution not included.

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Tension on a Sphere

Force applied by horse teams to an evacuated hollow metal sphere. Solution not included.

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Tension on a Yo-Yo

Force acting on the string of a descending yo-yo. Solution not included.

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Blocks and Pulleys

Acceleration of a system of multiple masses and pulleys. Solution not included.

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Spring Constant

Relationship between spring constants of springs used to suspend a mass. Solution not included.

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Turntable

Forces acting on a cube lying on a spinning turntable. Solution not included.

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Second Law and Projectile Motion

Motion of an object sliding off an inclined roof and falling to the ground.

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Experiment 3 Analysis

Approximating the force law acting between magnets.

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Experiment 5B Analysis

Motion of two unequal masses suspended by a string over a rod.

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Stacked Blocks

3-part problem; drawing free-body diagram and finding acceleration; force required to slide top block relative to bottom.

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Jumping Man

Motion of and forces acting on a jumping basketball player.

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Mass on an Accelerating Surface

Dynamics of a bead of water on the windshield of an accelerating car.

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Suitcase on a Conveyor Belt

Dynamics of a suitcase placed on a moving conveyor belt.

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Spinning Rod and Mass

Dynamics of a system of a mass suspended from a vertical spinning rod by a string and pulley.

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Mass Hanging over the Edge

4-part problem; finding acceleration, tension, time, and speed for mass on table to reach pulley while other mass hangs.

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Circular Motion in a Cone

4-part problem; drawing free-body diagram and finding v, T for object; maximum speed with friction.

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Weight from a Jump

Determining upward speed from a jump given force exerted on the floor.

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Weightlifter on a Scale

Effect of lifting a barbell on scale reading.

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Monkey and Pulley

Motion of a monkey climbing a rope that passes over a pulley and connects to a hanging block.

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Jumping Basketball Player

Forces acting on a basketball player jumping to take a shot.

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Inclined Plane and Pulley

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Motion of a block on an inclined plane and connected to a second block via a wire that passes over a pulley.

Motion of two blocks on an inclined plane and connected to a third block via a wire that passes over a pulley.

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Blocks on a Table

Motion of two touching blocks on a frictionless table.

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Inclined Plane, Friction, Spring

Motion of a mass that slides down an inclined plane and compresses a spring.

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Scale in an Elevator

Modeling the forces and acceleration acting on a person riding an elevator.

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