Support Reaction Demos

1
Support Reaction Demos

• Examples of pin support and sliding supports
  constraining the motion of a rigid body

2
Objectives

• This tutorial contains a series of experiments to
  show how a pin joint and a pin-slider joint
  prevent a bar from moving in certain ways.
• It also shows how the effect of a pin joint can
  be mimicked by two perpendicular forces.
• At the end of this tutorial , you should be able
  to.
• Describe the motion of a free (unrestrained body)
  when it is subjected to a force
• Describe the role of a pin joint and a pin slider
  in preventing certain motions
• Describe how the effect of a pin joint is
  equivalent to two perpendicular forces

3
Unrestrained Body

• A body that is not restrained can experience a
  combination of translation and rotation when
  acted upon by an unbalanced force.
• Notice how the bar rotates and slided to the force

Click to play video
4
Restrained Body Pin Joint

• One way to restrain the motion of a body is to
  pin a spot on the body to ground.

Click to play video
Pin support
In the video, notice that the pin Prevents
TRANSLATION But allows the bar to ROTATE
5
Pin Support Reactions

• Did you observe that the pinned end was
  constrained from moving in the horizontal or
  vertical direction?
• This indicates that a force along each direction
  kept that end of the beam from moving.

Click to play video
6
Slider Support

• A slider support restricts motion along a
  specified axis.
• That is, one direction is free to move back and
  forth, while the other is fixed.
• In the video, notice that the bar can slide
  horizontally but not vertically

Click to play video