Unit3 AOS3 - Relationships between force, energy and mass Flashcards
What is Impulse
the change in momentum of an object - occurs due to a constant force that acts over a given time interval
What is the direction of impulse
Always in the same direction as the change in momentum and velocity
Impulse Calculations
What is Work Done (+3 ways to calculate it)
It’s the change in energy of an object caused by a force
Change in Energy:
W = Efinal - Einital
(provided the change in energy occurred as a result of a force)
Product of Force & Displacement:
W=Fs (where s is the distance moved in direction of force)
Force-Displacement Graphs:
The area under a force-displacement graph is equal to work
Impact of Direction of Displacement on W=Fs
Definition of Power
Rate of Change of Energy (measured in W or J/s)
P = Energy/Time
Conservation of Energy
Energy is always conserved - therefore - it can only be transformed
Kinetic Energy
Energy associated with motion
Elastic vs Inelastic Collisions
Elastic Collisions - where kinetic energy is conserved
Inelastic Collisions - where kinetic energy is not conserved
Is momentum conserved in a collision
Yes
Where does the energy go in inelastic collisions
The energy will be transformed into other forms of energy - e.g. heat/sound/deformation of objects
Strain Potential Energy
Energy associated with the potential energy stored in a spring
Hookes Law
Calculates the restoring form that an ideal spring applies when it’s compressed or extended
Natural Position of a Spring
Position where no external forces are acting on it - a spring in its natural position will not exert a force
Spring Equilibriums
Equilibrium point is the point at which the Fg = Fs, therefore creating a position with a net force of zero
The equilibrium point is both:
- the position where an object can reach its maximum speed
- the only position where an object can remain stationary over time
