ENERGY SYSTEMS
LESSON 1
Energy, work, force, power
Types of Energy
ATP
Reactions
LEARNING OBJECTIVES
1.
Can I define the terms Work, Force, Power
and Energy?
2.
Am I able to explain how ATP is broken down
and re-synthesised?
STARTER

Spot the 10
differences
DEFINITIONS
 Define
the following terms:
 ENERGY
 WORK
 FORCE
 POWER
DEFINITIONS




ENERGY = The ability to perform work;
usually measured in Joules (J)
WORK = Work (Nm or J) = Force (N) X
Distance (m)
FORCE = A push or pull that alters, or tends
to alter, the state of motion of a body. Measured
in Newtons (N)
POWER = The rate at which work can be
done; or Work ÷ Time. Measured in Watts (W)
DEFINITIONS
 Discuss
and try to explain the
following terms:
 KINETIC
ENERGY
 CHEMICAL ENERGY
 POTENTIAL ENERGY
DEFINITIONS



KINETIC ENERGY = Energy seen as muscle
movement. E.g. running
CHEMICAL ENERGY = Energy stored in
compounds in our bodies. E.g. ATP,
Phosphocreatine, Carbs & Fats
POTENTIAL ENERGY = Stored energy
waiting to happen. E.g. ATP does nothing until
the phosphate group is released with the help of
ATPase
ADENOSINE
TRIPHOSPHATE (ATP)




ATP is the only usable source of energy for
work
ATP is stored in the muscles provides kinetic
energy for muscular contraction
Breaking down the high energy bond between
the last two phosphate molecules acts as
potential energy
The breakdown of ATP will only last 2-3
seconds.
REACTIONS

EXOTHERMIC REACTION = this is a
reaction that releases energy


E.g. ATP is broken down into ADP and P and
releasing Energy for Muscle Contraction. This is an
Exothermic Reaction
ENDOTHERMIC REACTION = this is a
reaction which requires energy to be added

E.g. ADP and P receive Energy from the breakdown
of PC to join P onto ADP to make ATP. This is an
Endothermic Reaction
ADENOSINE TRIPHOSPHATE
(ATP)

Draw a diagram of ATP being broken down
(exothermic reaction)

Draw a diagram of ATP being re-synthesised
(endothermic reaction)
BREAKING DOWN ATP
RE-SYNTHESISING ATP
EXAM QUESTION

1 a)
b)
JANUARY 2005
Define the terms energy, work and
power, giving the units of
measurements for each.
(3 marks)
ATP is a most important compound.
Explain why ATP plays such a major
role during physical activity. (3 marks)
PLENARY
 Discuss
how you think ATP can be resynthesised during exercise of different
intensities and over different durations