Forces, Movement And Motion Flashcards
What is a vector?
A vector is defined as having both magnitude and direction.
Examples include force, acceleration, displacement, velocity, friction, and weight.
What is a scalar?
A scalar is defined as having only magnitude.
Examples include speed, distance, and mass.
Name three examples of a vector.
- Force
- Acceleration
- Displacement
Name three examples of a scalar.
- Speed
- Distance
- Mass
When drawing a labeled arrow on an object, what does a down arrow represent?
The down arrow represents gravitational force.
It is not referred to as gravity or gravitational field strength.
True or False: A vector has only magnitude.
False
Fill in the blank: A scalar quantity has _______ only.
[magnitude]
What is the relationship between vector and scalar quantities?
Vectors have both magnitude and direction, while scalars have only magnitude.
describe how an object falling eventually reaches terminal velocity
- initially, object is accelerating.
-downward force greater than upward force. - as speed increases, drag increases.
-resultant force decreases - acceleration starts to become close to zero as upward and downward force become equal, reaching terminal velocity.
give reasons why air pressure decreases the higher we get
- temperature of air is colder, molecules move slower
-less molecules
-depth from top of atmosphere decreases
what is total energy out put same as?
work done
how does AC generate soundwave in speaker?
- AC changes continuously
-current in coil produces alternating magnetic field
- producing force on coil
- reversing direction of current and therefore force
- causes cone to vibrate, which therefore vibrates air particles.
why does resistance increase in filament lamp?
- lamp heats up
- more electron collisions
- hence resistance increases
cam also say filament in lamp melts
