Pushing & pulling
Goals:
o Moving stationary object linearly; no twisting; up/down, left/right, etc
o Strength and conditioning uses lots, bobsled, strongman tracker pull, etc
Biomechanical Factors:
-If moving, it continues to move
-If have high inertia, it’s harder to change it; harder to knock off course
-More mass it has, more inertia it has
o Resultant vector: sum of all forces acting on object
o Vector: characteristic of object that has magnitude and direction
o In world, there is > 1 force acting on 1 object
o Always deal with gravity and typically friction
Can use friction as advantage or it’s a disadvantage
o Air resistance is factor, too
o If push/pull, we have our forces
o Direction: up, right, 45 degrees up and left, etc)
o Point of application: where force is applied on object
o Push/Pull: to move object, unbalance forces => net force in direction you want object to go
-Want to push below COM to get bookcase moving in living room
-Apply force at right places so don’t create a torque (rotating, twisting)
More imbalance, more speed it will pick up
Sometimes have a little push and then let inertia take over (i.e. curling) => you want to get it to accelerate and gain momentum o Lifting
-To lift vertical, your force must be a little bigger to the weight of object => slow motion and gravity will stop it (i.e. lifting backpack on table) o Bicep Curl example
-Muscle needs to create torque bigger than torque/weight of weight in hand to lift object in hand; force further from axis; size of torque effects how much your muscles has to work to lift
See the subpage for a qualitative analysis for a push/pull activity!
o Moving stationary object linearly; no twisting; up/down, left/right, etc
o Strength and conditioning uses lots, bobsled, strongman tracker pull, etc
Biomechanical Factors:
- Inertia
-If moving, it continues to move
-If have high inertia, it’s harder to change it; harder to knock off course
-More mass it has, more inertia it has
- Static Equilibrium: if stationary, all forces acting on object
o Resultant vector: sum of all forces acting on object
o Vector: characteristic of object that has magnitude and direction
o In world, there is > 1 force acting on 1 object
o Always deal with gravity and typically friction
Can use friction as advantage or it’s a disadvantage
o Air resistance is factor, too
o If push/pull, we have our forces
- Properties of Forces
o Direction: up, right, 45 degrees up and left, etc)
o Point of application: where force is applied on object
o Push/Pull: to move object, unbalance forces => net force in direction you want object to go
-Want to push below COM to get bookcase moving in living room
-Apply force at right places so don’t create a torque (rotating, twisting)
More imbalance, more speed it will pick up
Sometimes have a little push and then let inertia take over (i.e. curling) => you want to get it to accelerate and gain momentum o Lifting
-To lift vertical, your force must be a little bigger to the weight of object => slow motion and gravity will stop it (i.e. lifting backpack on table) o Bicep Curl example
-Muscle needs to create torque bigger than torque/weight of weight in hand to lift object in hand; force further from axis; size of torque effects how much your muscles has to work to lift
See the subpage for a qualitative analysis for a push/pull activity!