10.1 Work and energy Flashcards
What is needed to make stationary objects move
Energy
What is needed to make stationary objects change shape
Energy
What is needed to make stationary objects warm up
Energy
Objects can possess energy in different types of stores such as:
Gravitational potential stores
Kinetic stores
Thermal stores
Elastic stores
Energy can be transferred between objects in different ways such as:
By radiation
Electrically
Mechanically
What is energy measured in
Joules (J)
What is 1 Joule equal to
The energy needed to raise a 1N weight through a vertical height of 1m
ENERGY CANNOT BE…
…CREATED OR DESTROYED
What is the principle of conservation of energy
Energy cannot be created or destroyed
Work done equation
Work done=force*distance moved in the direction of the force
What is the unit of work
Joules (J)
Equation of work done in terms of yachts
W=Fscosθ
If θ =90, the work done is zero as cos90=0
What does the area under the line of a Force-distance graph show
The work done
What is Hooke’s law
The force needed to stretch a spring is proportional to the extension of the spring
To stretch a spring to extension ΔL
work done=1/2FΔL
