Topic 2 - Motion And Forces Flashcards
(24 cards)
What is a scalar
Has a magnitude but no direction
What is a vector
Has a magnitude (size) and direction
What is the difference between a vector and a scalar
A scalar has a magnitude (size) but no direction but a vector has a magnitude and a direction
What are vector quantities
Force, speed, average velocity
What are scalar quantities?
Volume, density,speed,energy,mass and time
What is velocity?
Speed in a stated direction
Equation for speed?
Speed=distance/time
Distance travelled?
Distance travelled = average speed (m/s) x time (s)
Where do you get the speed from a distance time graph?
Gradient
Acceleration equation?
Acceleration (m/s2)=charge in velocity(m/s) /time taken (s)
A=(v-u)
t
What do you get from the gradient of a velocity time graph?
Acceleration
How to find distance travelled from velocity time graph
Area between the graph line and the time axis
How to determine speeds of objects (experiment)
Using light gates, ramp and trolly
Typical walking speed
5km an hour
Speed of Sound
343 m/s
Gravity on earth
10
Newtons 1st law
Every object will remain at rest until it’s state is changed by action of an external force.
Newton’s second law
Resultant force =mass x acceleration
3rd law
Every action has an equal and oposite reaction
How is weight measured
Weight = mass x gravity
Momentum?
Momentum = mass x gravity
Examples of momentum in collisions
- momentum in conserved
-total momentum before = total momentum after
By what proportion is speed bigger than thinking distance?
3x
Stopping distance equation
Stopping distance = thinking distance + breaking distance
