11.2 Force Flashcards
What is force
A push/pull on an obj
How do we represent force
Drawing arrows
fr where force acts, point in direction of force
Longer —> larger force
Force can change the ____ and ____of motion of an obj
Speed, direction
In what 3 ways does force change speed of obj
Moving obj: faster/slower
Moving obj: stop
At rest: start moving
Unit of force
Newton (N)
2 things to measure force
Spring balance
Force sensor connected to data logger
What can spring balance measure
Pulling forces only
What can force sensor connect w data logger measure
Pulling, pushing forces
Relationship between applied force on spring and the stretched length of spring
Larger applied force stretches the spring more
Forces can be classified Into _____ and ______forces
Contact, non-contact
What are contact forces
Act on obj when objs are in contact
Eg sit on sofa (supporting), lift dumbbell
What are non-contact forces
Act on obj even when they aren’t in contact, can act at distance
Eg magnetic forces, ball in air pulled down by force of gravity
What is a free-body diagram
Shows all forces acting on obj
W labelled arrows
Overall effect of forces
balanced forces effects
Obj at rest stays at rest
Moving obj same speed,direction / uniform motion
Unbalanced forces effects
Motion of obj changes
(Left force not equal to right force)
