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2. Dynamics
1. Introduction
2. Hooke´s law
3. Newton´s laws
4. Types of forces
5. Equilibrium
6. Misconceptions
© NASA
1. Introducción
Definition
Deformations
Change of state of motion
© eschooltoday.com
2. Elasticity: Hooke´s law
Ejemplos de cuerpos elásts
https://www.youtube.com/watch?v=S
Ley de Hooke
Elastic /yield point
Fracture /tensile point
http://po4h36.wixsite.com/laborat
oriovirtual/ley-de-hooke
© the-physics-philes-lesson
3. First Newton´s law (inercia)
When no unbalanced force is acting on a body , either
it stays at rest or keep moving at the same velocity
© Askeyphysics.org
3. Second Newton´s law
If an unbalanced force acts on a
body, its acceleration is proportional
to this force
Inertia: resistance to be pulled
http://po4h36.wixsite.com/laborato
riovirtual/blank-15
http://po4h36.wixsite.com/laborato
riovirtual/masa-y-peso
© wikipedia
F∑ = m.a
3. Third Newton´s law
(acción y reacción)
If a body applies a force to a
second one, a force with ame
magnitude and opposie
direction is applied to the first
one
© www.hk-phy.org/
4. Types of force
Gravitational: mass is not weight
Electric /magnetic. Contact
Srong interaction: Nuclear
stability
Weak interaction: radiactivity
Fundamental interactions
equivalence
© universe-review.ca
4. Types of force
Weight: mg
Normal force: contact
force applied by a
surface which supports
a body
Free body diagrams
© khanacademy.org
4. Forces of friction
Contact force
Usually applied opposite to
motion (exceptions)
It doesn-t depend on
area /speed
Type of material:
Coefficient of friction
Force between two bodies
(Normal)
FF = µ.N © study.com
5. Equilibrium
Equilibrium: condition required
to keep at rest over time
Forces & torques balanced
Definition of torque
http://po4h36.wixsite.com/lab
oratoriovirtual/barra-en-
equilibrio
© thinklikeanengineerproject.com
F = 0∑ M = 0∑
6. Misconceptions
 Three students are running
as shown beside. The firt one
throws a stone vetically
upwards. Explain which
students is going to get the
stone and why
Carrascosa (1987), Hierrezuelo y Montero (1989)
6. Misconceptions
© L. C. Epstein
6. Misconceptions
© L. C. Epstein
6. Misconceptions
© L. C. Epstein
According to the diagram below,
which hand is going to apply a force
easily?
a.A hand
b.B hand
c.Both apply the same force
d.B hand appliy twice as A
6. Misconceptions
If you want to hold a brush
and keep it at equilibrium,
you have to hold at

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2dynamics

  • 1. 2. Dynamics 1. Introduction 2. Hooke´s law 3. Newton´s laws 4. Types of forces 5. Equilibrium 6. Misconceptions © NASA
  • 3. 2. Elasticity: Hooke´s law Ejemplos de cuerpos elásts https://www.youtube.com/watch?v=S Ley de Hooke Elastic /yield point Fracture /tensile point http://po4h36.wixsite.com/laborat oriovirtual/ley-de-hooke © the-physics-philes-lesson
  • 4. 3. First Newton´s law (inercia) When no unbalanced force is acting on a body , either it stays at rest or keep moving at the same velocity © Askeyphysics.org
  • 5. 3. Second Newton´s law If an unbalanced force acts on a body, its acceleration is proportional to this force Inertia: resistance to be pulled http://po4h36.wixsite.com/laborato riovirtual/blank-15 http://po4h36.wixsite.com/laborato riovirtual/masa-y-peso © wikipedia F∑ = m.a
  • 6. 3. Third Newton´s law (acción y reacción) If a body applies a force to a second one, a force with ame magnitude and opposie direction is applied to the first one © www.hk-phy.org/
  • 7. 4. Types of force Gravitational: mass is not weight Electric /magnetic. Contact Srong interaction: Nuclear stability Weak interaction: radiactivity Fundamental interactions equivalence © universe-review.ca
  • 8. 4. Types of force Weight: mg Normal force: contact force applied by a surface which supports a body Free body diagrams © khanacademy.org
  • 9. 4. Forces of friction Contact force Usually applied opposite to motion (exceptions) It doesn-t depend on area /speed Type of material: Coefficient of friction Force between two bodies (Normal) FF = µ.N © study.com
  • 10. 5. Equilibrium Equilibrium: condition required to keep at rest over time Forces & torques balanced Definition of torque http://po4h36.wixsite.com/lab oratoriovirtual/barra-en- equilibrio © thinklikeanengineerproject.com F = 0∑ M = 0∑
  • 11. 6. Misconceptions  Three students are running as shown beside. The firt one throws a stone vetically upwards. Explain which students is going to get the stone and why Carrascosa (1987), Hierrezuelo y Montero (1989)
  • 14. 6. Misconceptions © L. C. Epstein According to the diagram below, which hand is going to apply a force easily? a.A hand b.B hand c.Both apply the same force d.B hand appliy twice as A
  • 15. 6. Misconceptions If you want to hold a brush and keep it at equilibrium, you have to hold at