Work and Energy - Physics 101 / AP Physics 1 Review with Dianna Cowern

In this lesson, Diana explores the concepts of energy and work in physics. She explains the definitions and units of work and energy, introduces kinetic and gravitational potential energy, and discusses conservative and non-conservative forces. Through examples, she demonstrates how to calculate work and energy, and how these concepts can simplify problem-solving in physics. The lesson concludes with a discussion on energy transfer and conservation, emphasizing the importance of understanding energy changes in various contexts.

What is the unit of work in physics?

• Joule

• Pascal

• Watt

• Newton

How is work calculated in physics?

• Mass times acceleration

• Force times distance

• Velocity times time

• Force times time

What is the formula for kinetic energy?

• mgh

• mv^2

• 1/2 mv^2

• 1/2 mgh

How does kinetic energy relate to speed?

• Directly proportional to speed

• Inversely proportional to speed

• Proportional to the square of speed

• Independent of speed

What is gravitational potential energy dependent on?

• Time and speed

• Mass and velocity

• Height and mass

• Distance and force

What happens to potential energy as an object falls?

• It increases

• It decreases

• It remains constant

• It converts to kinetic energy

What is a conservative force?

• A force that changes with speed

• A force that depends on time

• A force that does work independent of path

• A force that is always constant

Why is friction considered a non-conservative force?

• It only acts in space

• It is independent of the path

• It does not do any work

• It depends on the path taken

What is the advantage of using energy methods over kinematics?

• It is less accurate

• It simplifies problem-solving

• It requires more calculations

• It is more complex

How can energy methods simplify solving a ramp problem?

• By focusing on time

• By ignoring friction

• By using only force

• By using potential and kinetic energy