Force, Work, Power and Pressure - Key Concepts (copy)

Force

• A force can cause a stationary object to move.
• A force can cause a moving object to:
  • Move more quickly.
  • Move more slowly.
  • Change direction.

Weight and Mass

• Weight: The force pulling an object towards the center of the Earth, measured in newtons (N), has a direction, and can change based on location.
• Mass: The amount of matter in an object, measured in grams or kilograms, has no direction, and remains constant.
• Formula to convert mass to weight:
  weight (in \text{ newtons}) = mass (in \text{ kilograms}) \times 10

Extension of a Spring

• The extension of a spring is related to the force applied.
• Graphing force vs. extension can determine the extension caused by a specific force or the force needed for a specific extension.
• Elastic Limit: Springs have an elastic limit; stretching beyond this limit can result in the spring not returning to its original shape.

Moment of a Force

• A force can cause an object to move in a circular manner (spin).