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6.8 Power -- Part 6

- It sounds reasonable that the condi is positioned closer to it.

- The outcome on the meter stick should be zero, as should the sum of the predictions.

- The brick on the stick has a rotation axis that we can choose from, so we have the freedom to do what we want.
- Let's try it again with the axis of rotation at ity around the axis of rotation and produce a negative 40 cm from the left side of the brick.
- See the numbers.
- The stick force diagram shows the force exerted by the right scale.
- The force condition of equilibrium has a counterclockwise turning ability and does not depend on the choice of positive Torque.
- The stick has zero Torque since it is at the axis of rotation.

- The axis of rotation has moved to a new position.

- The stick has to exert a balancing force on the brick.

- When we chose a Rolin Graphics xis of rotation at the left end, it was new.

- The left scale on the stick exerts 0 force on LS.

- Earth and the brick exert force on the meter stick.

- The force on the left end is greater because of the brick's choice of the axis of rotation.

- Chapter 7 extended bodies at rest of rotation does not affect the results.
- The meter stick tips over the edge if it is extended more than 30 cm.

- Stick doesn't affect the outcome of an experiment.
- The outcome of actual experiments should not be affected by the concepts of axes of rotation and coordinate systems.

- A uniform meter stick with a 50-g ob ject is positioned as shown below.
- The edge of the table has a stick over it.
- If you push the stick to the side, it tips over.
- The mass of the meter stick can be determined using this result.

- It is helpful to place the axis on the rigid body where the force you know least about is exerted.
- You can use that equation to solve for some other unknown quantity when the force drops out of the second equilibrium condition.

- The human body is a good example of an extended body not being rigid.

- The rest of the body is at a lower elevation so that her center of mass is always slightly below the bar.

- We change the position of our center of mass with respect to other parts of the body a lot.
- Try this experiment.
- Try to stand up without using your hands.
- If your back is vertical, you can't raise yourself from the chair.

- The front of the abdomen is the center of mass for an average person.
- If you managed to lift yourself off the chair and keep the back straight, the experiment would look like a force diagram.

- Earth and the floor exert downward and upward force on your feet.
- The rotation of the chair is caused by the Torques caused by these two forces.

- To stand, you have to tilt your head in a clockwise direction and move your feet under the chair.

- You don't have to use your hands to get out of a chair.

- You should bend forward so that your feet are on the floor.

- Torques caused by these two forces allow you to stand without touching the chair seat.

- Section 7.1 deals with the location of an object's center of mass and how to push it on a smooth surface.
- At dif ferent locations on the object, we found that lines drawn along the directions of the pushing forces all intersect at the center of mass.
- It is impractical to find the center of mass in a diffi cult.
- The method of balancing the object on a pointed support was investigated.
- This isn't very practical with respect to humans.

- Blocks are represented as an expression for the center of mass.

- The system exerts 1 forces.

- The total of al Torques ex- the force of gravity on the system is zero.

- Each of the people blocks are modeled as point-like objects and the seesaw is modeled as a rigid or body.
- To get an expression for the location of the center of the force.

- Let's look at this result.

- If the result makes of all forces relative to sense, then we know the locations.
- There are no people sitting on the ground.

- We assumed its mass was uniformly distributed.
- If we increase the mass of one of the people on the seesaw, the location of the center of mass moves closer to them.

- The term "center of mass" is not true.
- The weight lifter is on each side.
- This is not the case.

- 30 kilo is the number 3.

- The origin can be anywhere.
- The center of mass of per son is on the left side.

- The mass on each side of the center of mass is not equal.

- There is more mass on the left side of the center of mass than on the right side.

- There will be 3 m of balance here.

- There is more mass on the left side of the center of mass than on the right side.

- The whole system of seesaw will balance here.

- The mass of people are not equal.
- The mass on the left side of the center of mass is more than the mass on the right side.
- The larger mass on the left is closer to the center of mass than the smaller mass on the right.
- Torques of equal magnitude are caused by the product of mass and distance on each side.
- We could change the center of mass to be the center of Torque, but since this is not the term used in physics, we still use the term center of mass.

- The mass on the left and right side of the center of mass may not be equal.

- The two fingers are shown below.
- 2 are connected by a rod.
- How does the mass of the knife on the left compare to the mass of the knife on the right?

- The mass of the handle end must be greater than the mass of the bread knife.

- A barbel has a 10- kilo plate on one end and a 5- kilo plate on the other.
- The center of ward normal force and Earth exerts a down mass of the barbell, which is also the balance point for ward gravitational force.
- The plates on the ends must be connected by two forces if the rod is to be stable.

- There is 0.67 m from the end.

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