Topic 4 - Forces and Energy Flashcards
(21 cards)
When a system changes, what is transferred?
Energy
Finish the sentence: Energy can be transferred ____ or ____ ____ the system
Into
Away from
In what three ways can energy be transferred?
- By heating
- By forces doing work
- By electrical equipment
If a force moves an object, what is done?
Work
To make an object move, what must act upon it?
A force
What is 1J of work equal to?
1N of force moving an object by 1m
What is power?
The rate of energy transfer
Finish the sentence: ____________ between objects cause forces
Interactions
What type of force is one that requires objects to touch?
Contact forces
Give 2 example of contact forces:
- Friction
- The normal contact force that acts between all touching objects
What type of force is one that acts between objects that are not touching?
Non-contact forces
What is the most well-known non-contact force?
Gravity/Gravitational Fields
What do free body diagrams show?
All of the forces acting on an object
What do the sizes of arrows show in a free body diagram?
The relative magnitudes of the force
What is a resultant force?
The overall force on an object
When would an object have a resultant force of 0?
When it is in equilibrium, as all the forces cancel each other out
How can you find a resultant force?
By using a vector diagram
In a vector diagram, what are the horizontal and vertical lines called (forces you are given)?
- Horizontal Component
- Vertical Component
What is a moment?
The turning effect of a force
What do levers make it easier for us to do?
Work
What do gears do?
Fit together to transmit turning effects
