10.1- WORK AND ENERGY Flashcards
What is energy needed to do to a stationary object? (3)
energy needed to make stationary objects move, to change their shape, or to warm them up
When you lift an object up where do you transfer energy from and where to?
transfer energy from muscles to object
Examples of energy in different types of stores that objects can possess? (4)
gravitational potential stores
kinetic stores
thermal stores
elastic stores
What is gravitational stores of energy?
position of object in gravitational field
What objects have energy in kinetic store?
moving objects
What objects have energy in thermal store?
hot objects
What objects have energy in elastic store?
objects compressed or stretched
Examples of ways that energy can be transferred between objects? (3)
radiation (e.g. light)
electrically
mechanically (e.g. sound)
What is energy measured in?
joules (J)
What is one joule equal to?
energy needed to raise a 1N weigh through vertical height of 1m
What does the principle of conservation of energy state?
energy cannot be created or destroyed
When is work done on an object?
when force acting on it makes it move
When work is done on an object, what is transferred?
energy transferred to object
What does the amount of work done on an object depend on?
depends on force + distance object moved
What happens to work done, the greater the force or further the distance?
greater the work done
