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6.8 Power -- Part 5

- Let's see if the new quan tity is useful for explaining other situations.
- You can do this experiment at home.
- Lifting a bag with one hand is easy if you hold it at the end.
- When the stick is tilted up, try to hold the handle end of the horizontal.

- The broomstick can turn around an axis through the hand that is closest to you.
- The broomstick is far from the axis of rotation when the bag exerts force.
- In order to determine the turning ability of the bag on the broomstick, we must find a large quantity.
- The bag must be balanced.

- It is difficult to exert force on your hand.

- It's difficult to hold the broomstick to your body.

- The actual direction of the force is not taken into account.
- The turning ability of the force is affected by the angle at which we exert a force relative to the broomstick.

- We know from experience that pushing on a door on its outside edge does not cause it to move.

- The broomstick is being tilted.
- It's easier to hold if we improve our model for the physical quantity.

- There is a constant force of 10.0 N downward at a 90 angle on the far right end of the meter stick.
- On the far left end of the stick, scale 1 will pull at different angles so that the meter stick stays horizontal.
- The turning ability of the force on the right is balanced by the force on the left in all cases.

- Bag on Stick is needed to produce the same turning ability.

- An experiment to determine the angle dependence of the turning ability the turning ability of a force is caused by a force.

- 1u2 is a function of the angle.

- Take a look at the last row of Table 7.3.

- The force makes the angle smaller.

- The sin 30 is 0.50.

- A method to determine the +112.6 N210.5 m21sin 532 is provided.

- The method for calculating the turning ability is shown in Figure 7.10 If the force has a counterclock, the Torque is positive, the Draw the force wise turning ability is negative, and the beam is positive.

- The British system unit islb # ft, while the SI unit is newton # meter, N # m.

- The units of 1N # m2 are the same as the units of energy 1N # m. Torque and energy are not the same.
- The unit of energy and the unit of Torque will always be referred to as joule and newton # meter 1N # m2 respectively.

- An expression for the distance from the axis of rotation to the place where the force is exerted.

- The force makes a 30 angle relative to a line from first and the smal est magnitude Torque last, if you rank the magnitudes of the Torques that the strings exert on the beam.
- If the pivot point is the place where the string exerts the Torques have equal magnitudes.
- The force on the beam needs to be answered.
- Before looking at the answer below, String 5 exerts a force paral el to the question.

- The rank order is t2 + t4 + t1 + t3 + t5.

- The Torque produced by each force is shown to be low.

- Each string tends to turn the beam counterclockwise.

- Pretend that a pencil is the rigid body to determine the sign of the force that exerts on it.

- A method for determining the sign of a Torque.

- A painter stands on a ladder and chooses the axis of rotation where the feet are relative to the ground.
- He is standing with his feet on the ground.
- The Torque was produced by the ladder.

- Our system is not the same as the ladder that Earth exerts on the painter.

- The painter tends to rotate the ladder clockwise about the axis of ro about two different axes of rotation.

- A 37 angle axis is relative to a line from the axis of rotation to the place parallel to the top of the ladder.

- The painter's feet exert a lot of Torque on the ladder.
- The painter's feet exert themselves on the ladder.
- The diagrams show the different axes of rotation.

- When we choose the axis of rotation at the top of the lad der, the downward force by the painter's feet on the ladder tends to rotate the ladder counterclockwise about the axis.
- A line from the axis of College Physics has an angle of 143 with respect to the place where the force is exerted.

- The axis of rotation affects the to Pearson rque.

- We use it.

- The floor tends to exert force.

- An example of a situation in which a force is zero with respect to one axis of rotation but not zero with respect to another is given.

- We can combine our previous knowledge of forces with our new knowledge of Torque to determine what conditions rigid bodies remain in at rest.

- An object can be at rest for a short time.
- A ball that stops for an instant at the top of its flight does not stay at rest.
- The words "with respect to an observer in an inertial reference frame" are an important part of the definition of static equilibrium.
- If an observer is not in a reference frame, an object can accelerate with respect to the observer even if the sum of the forces on it is zero.

- Earth is the most common point of view for observing real-life situ ations.

- The meter stick from spring scale 2 is again suspended.

- The center of mass of the meter stick is no longer the suspension point.
- You and your friend pul on the stick at scales 2 and 3, but not at scales 1 and 3.

- The stick to rotate is caused by pul ing at other positions while pulling at the same posi tions.

A meter stick is equal to 1-6.0 N2 + 9.0 N + 1-1.0 N2 + 1-2.0 N2

- The distances in the equations for each force are determined by this choice.

- A meter stick is shown at the locations shown.

- The sum of the Torques on the meter stick is zero.

- The first pattern is familiar to us.
- You can't zero translational acceleration.
- There is no vertical acceleration because the sum of the vertical forces determine the Torque produced on the meter stick is zero.
- The meter stick couldn't accelerate horizontally because we didn't specify the zontal forces.
- In the experiments presented in the table, the object relative to the axis of net Torque is zero and the meter stick does not start turning.
- In rotation, we will learn.

- If the ob rigid body is at rest with respect to the different parts of the in turning or rotating static equilibrium, the Earth can be combined into server.

- The ends of a standard meter stick can be placed on scales.
- The mass of the meter stick is deduced from the fact that the scales read 0.50 N.

- If you place a brick 40 cm to the right of the left scale, the scale will read it.

- The meter stick is modeled as a scale 1 and scale 2 with a uniform mass distribution.

- Colle ends the stick.

- The place where the scale touches the stick is where we chose the axis of rotation.

Analyzing the situation with the axis of ing the Torque produced by the normal force exerted pc 3/26/12 18p0 x 10p5 rotation on the left side of the meter stick by the left scale on the stick zero

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