Exploring Work and Energy Concepts in Physics

This video lesson, part of Dianna's Intro to Physics Class, explores the concepts of energy and work. It begins with a demonstration involving a bowling ball and covers the definition and calculation of work, the units of work and energy, and the concepts of kinetic and potential energy. The lesson also discusses conservative and non-conservative forces, using examples like a space cow and a wrecking ball. The video concludes with key takeaways and encourages further exploration of physics problems.

What is the main theme of today's lesson?

• Friction

• Work and Energy

• Gravity

• Motion

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-2

NGSS.HS-PS2-3

In the space cow example, what force is used to push the cow?

• 50 newtons

• 150 newtons

• 100 newtons

• 200 newtons

Tags

NGSS.HS-PS2-1

What is the unit of work in physics?

• Watt

• Joule

• Meter

• Newton

Who is the joule unit named after?

• James Prescott Joule

• Albert Einstein

• Nikola Tesla

• Isaac Newton

What type of energy does the cow gain after the rocket does work on it?

• Potential Energy

• Chemical Energy

• Thermal Energy

• Kinetic Energy

What is the formula for kinetic energy?

• mv^2

• 1/2 mv^2

• mgh

• F * d

Tags

NGSS.HS-PS3-2

What is gravitational potential energy dependent on?

• Force and distance

• Time and distance

• Mass and height

• Mass and velocity

What is an example of a non-conservative force?

• Electrostatic force

• Friction

• Magnetism

• Gravity

What happens to the energy when a wrecking ball bounces on a trampoline and doesn't reach its original height?

• It increases

• It remains the same

• It is converted to sound and heat

• It is destroyed

What is the main takeaway about energy from this lesson?

• Energy is always created

• Energy is always conserved

• Energy is always about transfer

• Energy is always lost

Tags

NGSS.HS-PS3-4