All Flashcards
What is the definition of Power?
The rate at which work is done or energy is transferred. It is a scalar quantity.
What are the units for Power?
Watts (W) or Joules per second (J/s)
Define instantaneous power.
The rate at which work is being done at a specific moment in time.
What is the effect of increasing the force applied to an object, assuming constant velocity?
Increased instantaneous power.
What happens if the angle between force and velocity is 90 degrees?
Instantaneous power is zero because .
What is the effect of increasing the time interval over which work is done, assuming constant work?
Decreased average power.
What happens when energy is transferred more quickly?
The power increases.
What happens when work is done in a shorter amount of time?
The power increases.
How do you calculate power using work and time?
Use the formula: , where P is power, dW is the change in work, and dt is the change in time.
How do you calculate power using force and velocity?
Use the formula: , where P is power, F is the force vector, and v is the velocity vector. Remember to use the dot product.