Motion And Forces Flashcards
Scalar
Magnituide but no direction
Vector
Both magnitude and direction
Name 3 scalar quantities
Speed
Distance
Temperature
Vector quantities
Displacement
Velocity
Weight
25km going east shows
Displacement (vector)
Is power scalr or vector
Sclar
Acceleration
Change in velocity/time
Final velocity squared- initial velocity squared / 2x distance
Acceleration is a
Vector
Distance
Final velocity squared - initial velocity squared divided by 2x acceleration.
How to find the velocity of acceleration
Draw tangent on the point and use it to find gradient of the line0p
On velocity graph distance travelled
The area under the lines
Range of lab methods used for finding speed of obkects light use of light gates
Light gates used cause more accurate
Speed of typicalstuff
Walking 1.5m/s or 3.4 mph
Run 5 or 11
Cycle 7 or 15
Car 30 or 67
Train 56 or 125
Plane 250 ot 560
What speed is acceleration in free fall
10m/s squared
Newton 1st law
Resultant force required to change the motion of object
Newton 2nd law
Non -zero resultant force acts on
object then cause to accelerate
Resulatant force = mass x acceleration
Newton 2nd law is a change in acceleration but not speed why
Cause we change direction and acceleration vector
Inertia
Newton 1st law
Initial masd
How difficult for object to change in velocity
Higher the initial mass the higher the inertia
Newton 3rd law
When 2 forces interact the forces they exert on eachother are equal(force) and opposite(direction)
Acceleration
Force/mass
When ibject pushes back with euqal and opposite force
Normal contact force
How do we measure weight
Measure the force pulling object to centre of earth
Blancing with a known force
If statiokary known force is same as weight
Measuring acceleration experiment
Trolley
Ramp
Masses
Card
Balamce
2 light gates
Clamp and stands
Method
Adjust the slope of the ramp so it just starts moving at c velocity
Length of card and put it in results
Weigh trolley and card
Set up light gets one at start and end
Add mass in contant intervals
Release the trolley to measure velocity and time takes
Centripetal force
Net force that acts upon object to keep moving in circular path
Momentum
Mass x velocity
Vector
Conservation of momenutm principle
Total momentum before = total momentum after
Velocity in terms of momentum
Momentum /mass
Force in terms of momentum
Change in momentum /time
Crumple zome
Zones wich crumple to reduce momentum
Seat belt
Slow momentum
Air bags
Slow momentum
Change in momentum
Mass x final velocity- mass x inital velocity
