Think of a spanner loosening a fixed nut, or a child on a seesaw, or a door opening around a fixed hinge. All of these things are connected by something called moments… A moment is the turning force around a fixed pivot. The pivot is the...

In this video, we learn about three types of simple machines: levers, wheel and axle systems, and pulleys. The different types of levers are explained, as well as the mechanical advantages of each. We also learn about the different types...

This live-action video program is about the term simple machine. The program is designed to reinforce and support a student's comprehension and retention of the term simple machine through use of video footage, photographs, diagrams and...

This live-action video program is about the word lever. The program is designed to reinforce and support a student's comprehension and retention of the word lever through use of video footage, photographs, diagrams and colorful, animated...

Students learn to define and recognize the six simple machines: the inclined plane, the wedge, the screw, the lever, the wheel and axle, and the pulley. Real life situations demonstrate the function and purpose of each machine. Students...

"The jury should stay out on whether the Fed is done or not," Richard Bernstein Advisors CEO and CIO Richard Bernstein says. Speaking with Jonathan Ferro on "Bloomberg The Open," Bernstein also says he sees a lot of attractive...

Kids playing outside in the summer. Water Park Sprinkler on August 19, 2013 in Chicago, Illinois (Footage by Tribune Broadcasting/Getty Images)

Young Girl Going down Slide / Seesaw / Roundabout / Childhood Playground on April 01, 1968 in Farmington, Utah (Footage by Getty Images)

Balancing Feather and Stones, close-up, Imbalance concept

Ancient playground of wood in Tallin.

Slow Motion: Children Playground, children's play equipment is very old and damaged, may be harmful to the players footage

Slow Motion: Children Playground, children's play equipment is very old and damaged, may be harmful to the players footage

Title card: "At home with the candidates" superimposed over circles with candidates faces / VS an elegant car leaves the Roosevelt home 'Springwood' / VS the house / Pres. Franklin Roosevelt reads and then looks at the camera / Eleanor...

Children sit on ground at long, low outdoor table, with swing sets and see-saws behind and model home community behind; the community is operated by the Sugar Planters Association for its employees / LS down table with children of Asian...

mom with two kids spending holiday time in the wood

Empty swing swaying

Father and girl on playground

HD:Woman on swing on the beach with sea at sunset time , slow motion , relaxation concept

Methane well in a field.

kids on the teeter totter

Seamless Loop

young woman relaxing on the swing

young woman relaxing on the swing

Empty Spring Style Seesaw in a Playground