TED-Ed: Would you weigh less in an elevator? - Carol Hedden

The video explores the physics of an elevator in free fall, examining forces acting on a person standing on a scale inside it. It explains how gravity and the normal force interact, using Newton's second law to describe equilibrium and changes when the elevator accelerates. The video also discusses the effects of jumping inside a falling elevator and considers scenarios like upward acceleration and cable failure.

What is the main question posed at the beginning of the elevator problem?

• How fast can an elevator go?

• What happens if you jump when the elevator starts descending?

• Can you stop an elevator from falling?

• What is the weight of the elevator?

What are the two forces acting on a person standing on a scale?

• Tension and friction

• Gravity and the normal force

• Normal force and tension

• Gravity and friction

According to Newton's second law, what happens when there is no acceleration?

• The net force is zero

• The net force is positive

• The net force is negative

• The net force is equal to mass

What happens to the scale reading when the elevator starts falling?

• The scale reading decreases

• The scale reading stays the same

• The scale reading increases

• The scale reading becomes zero

If the elevator cable is cut, what is the primary force acting on the elevator?

• Normal force

• Gravity

• Tension

• Friction