Energy Analysis with Forces Flashcards
1
Q
What is the theoretical energy analysis for constant forces?
A
Point 1 (start of race) = no energy in kinetic store, more energy in chemical store Point 2 (end of race) = some energy in kinetic store, less energy in chemical store
2
Q
What is the realistic energy analysis for constant forces? Why?
A
In reality, some energy is transferred to the thermal store of the surroundings because of friction, sound, air resistance
3
Q
How do you analyse situations involving braking?
A
Point 1 (moving car) = more kinetic store, less thermal store Point 2 (stationary car) = no kinetic store, high thermal store
4
Q
How do you analyse situations involving springs?
A
Point 1 (gymnast mid air above uncompressed spring board) = no elastic store, medium kinetic store and gravitational store Point 2 (gymnast momentarily stationary on compressed spring board) = high elastic store, no kinetic store, low gravitational store
5
Q
How do you analyse situations involving gravity theoretically?
A
Point 1 (as ball leaves your hand) = medium kinetic store, low gravitational store Point 2 (when ball stops momentarily) = no kinetic store, high gravitational store
6
Q
How do you analyse situations involving gravity realistically?
A
Point 1 (as ball leaves your hand) = medium kinetic store, low gravitational store, high thermal store Point 2 (when ball stops momentarily) = no kinetic store, high gravitational store, high thermal store
7
Q
How do you analyse situations when objects hit obstacles?
A
Point 1 (just before glasses land) = medium kinetic store, low thermal store Point 2 (when glasses have stopped moving) = no kinetic store, high thermal store
