FWE Flashcards
What is the Principle of Conservation of Energy
Energy cannot be created or destroyed but can be converted from one form to another or transferred from one object to another
When a ball rebounds, why is it unable to reach its original position [3]
Some energy has been transferred to the surroundings as heat and sound when it hits the floor
EPE<GPE at original position
EPE converted to KE + GPE when ball bounces up. GPE at max. height of ball< total energy before
Name 4 properties of a force
- Either a push or pull that exerts on another object
- Has both magnitude and direction
- Can cause a turning effect in objects and exert pressure on objects
- Can change shape, size, direction of motion or speed
What is chemical potential energy
Energy stored in fuels such as petrol and food that can be released through chemical reactions
How to calculate work done
Work done (J) = Force (N) x distance moved in the direction of the force (m)
What is energy
The capacity to do work
Define potential energy
Stored energy due to the body’s position or condition
Define pressure
Amount of force acting perpendicularly on a unit of area
Define elastic potential energy
Amount of energy stored in an object that is stretched or compressed
Define work done
The conversion of energy when energy is transferred between objects or converted from one form to another
What is gravitational potential energy
The amount of energy an object has based on its position or location
How does energy overcome friction/air resistance
Converted to thermal and sound energy
What is kinetic energy
Energy that a body has due to its motion
What does heat refer to
Flow of thermal energy
What is electrical energy
Energy transferred by the flow of charged particles
How is sound produced
When objects vibrate and it is transmitted through a material
What is an elastic force
Force that is acting on a stretched or compressed object to return it to its original shape, in the opposite direction of the force exerted
What is frictional force
Force exerted that opposes or tends to oppose the motion between surfaces in contact
What is gravitational field strength
The gravitational force acting on a unit mass of an object
What are electrostatic forces
The forces acting between two charged particles
If the speed and direction of the object does not change, can we conclude that there are no forces acting on it
No. We can only conclude that there is no resultant/net force acting on it
What is the force exerted by Earth’s atmosphere called
Atmospheric pressure
What are the three criteria for work to be done
- Force must be acting on object
- Object must move
- Object must move in direction of the force applied
What are the three components of work done
- Change in GPE
- Change in KE
- Energy converted to thermal and sound energy/work done against friction or air resistance
