Motivation and statement of Newton's second law; difference between mass and weight.

Statics problem of mass hanging from two angled strings solved and demonstrated.

Weight defined; weight on accelerating scales calculated; free-fall defined.

Acceleration and tension calculated for two masses suspended over a pulley.

Results interpreted as masses become unbalanced; gain and loss of weight in free-fall.

Calculation of tension at top and bottom of loop for mass swinging in vertical plane.

Demonstration that a gallon of water is weightless in free fall during jump from table.

Demonstration that barbell is weightless in free-fall, then very heavy on impact.

Video demonstration of the Vomit Comet and explanation of its cycle and conditions.

Definition, including normal force; μ_s = ∠tan α proven; method for determining μ_s.

Demonstration of dependence of μ_s on surface, but not surface area or mass.

System of block sitting on inclined plane, connected to hanging block; calculation of conditions when block is falling or is static.

Numerical calculations for pulley/plane system, including interpretation and calculation of acceleration and tension.

Demonstration of pulley/plane system; additional mass hangs, then falls; explanation of changing friction.

Explanation of friction elimination by hydroplaning and air tracks, with brief demonstrations.

Video of device that travels on cushion of CO₂ on plate glass; friction so low a flea can pull a large book on the device.

Moving two fingers towards each other under a yardstick causes alternating movement.

Statement that F=m*a; definition of mass; superposition of forces; second law examples.

Statement that F=m*a; definition of mass; superposition of forces; second law examples.

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

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

Definition of force (F=ma); superposition principle; definition of impulse and average impulse; Newton's second law equations for force, acceleration, momentum.

Newtonian induction; definition of Hooke's law; contact forces between surfaces; kinetic friction; static friction; fundamental forces of nature; definition of universal law of gravitation, with equation.

Newton's Second Law in components; step-by-step method for solving second law problems.

Definition of a reference frame; relative and relatively inertial reference frames; law of addition of velocities, with example problem; acceleration in relatively inertial reference frames; principle of relativity; tension in a massless rope; equations of motion, with special cases; constraint conditions in pulley systems.

Force modeling experiment setup and procedure.

4-part problem; finding work in terms of frictional force; stopping time; work to accelerate the box.

Solution (PDF)

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

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

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

Force and acceleration.

Solution (PDF)^#

Force needed to accelerate a cart to a specified speed. Solution not included.

Final speed of a cart acted on by a force. Solution not included.

Force acting on a passenger in a sharply turning car. Solution not included.

Detecting motion from inside a windowless, soundproof vessel. Solution not included.

Magnitude of force between two magnets as a function of distance.

Solution (PDF)

Forces acting on a mass connected to a rotating axle.

Solution (PDF)

Forces acting on a pivoted beam.

Solution (PDF)

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

Solution (PDF)

Motion of a small object that slides down a large sphere and hits the ground.

Solution (PDF)

Calculating μ_s by two methods.

Solution (PDF)

Free-body diagram and forces in pushing a book against a wall at an angle α.

Solution (PDF)

Asks why race cars use wide tires, even though friction is independent of surface area.

Solution (PDF)

Asks why a yardstick starts and stops along your fingers.

Solution (PDF)

Finding maximum extension, time to maximum velocity for spring extended on frictional surface.

Solution (PDF)

Kinetic vs. static friction and sign; magnitude of horizontal force on suitcase.

Solution (PDF)

Two blocks connected over pulley, on separate slopes; find α of pulley, a, and T.

Solution (PDF)^#

Relative motion and energy of two objects.

Solution (PDF)

Motion of a jet airplane after takeoff.

Solution (PDF)

Determining change in weight of person jumping and hummingbird taking off inside a closed box on a scale.

Solution (PDF)

Speed and tension at the top of the circle for ball swinging around.

Solution (PDF)^#

Force acting on an accelerating car.

Solution (PDF)

Relative mass of weightless objects.

Solution (PDF)

Reading a scale in an elevator.

Solution (PDF)^#

Finding the period of a pendulum in a moving elevator.

Solution (PDF)

3-part problem involving balls submerged in liquid; finding displaced mass, apparent weight of liquid container.

Solution (PDF)