effects of forces change shapechange shape. effects of forces change shapechange shape
TRANSCRIPT
Effects of Forces• Change shape
Effects of Forces• Change shape
Change of Shape
extensionForce is directly proportional to
extension
Force is directly proportional to extension
• When force doubles, the extension doubles
• F α x Fx
= constant
Hooke’s Law
Force is directly proportional to extension
F1
x1
=F2
x2m1
x1
=m2
x2
What if we put more weights than we did?
Limit of proportionalitySee p.23 SQ and Key Points See p.29 question 5
Effects of Forces• Change the state of motion
– Move from rest– Speed up– Slow down – Stop– Change its direction
Balanced forces
Balanced Forces
The book stays still!
Balanced Forces
The airplane moves forwards at constant speed!
Balanced Forces
The car moves at constant speed!
Drag
Friction
Thrust
Unbalanced Forces
The car moves from rest.
The car speeds up.
Unbalanced Forces
The car slows down to stop.
The car slows down.
See p.25 SQ and Key Points See p.27 SQ and Key Points