Public

Edited Invalid date

0

0

Quiz

17.6 Laws of Physics and Life -- Part 3

- This is also the weight of the object.

- There are illustrations of the third law in the text.

- The total linear momentum of a system of objects remains the same unless acted on by an outside force.

- Each point in an object is in motion as it rotates around a circle.

- The equations for motion are similar to the equations for movement.
- The relationships are shown in a table.

- Along the path, there may be differences in angular velocity and acceleration.

- As an object rotates around an axis, the magnitude of the linear velocity is constant, but the direction of the linear velocity is constantly changing.
- The center of rotation is where the change in velocity points.
- The body is accelerated toward the center of rotation.

- Newton's second law states that a force pointing toward the center of rotation must act on the body because it is accelerated toward its center of rotation.

- A centripetal force is needed for a body to move along a path.
- The body moves in a straight line in the absence of a force.
- An object twirled at the end of a rope.
- The rope applies the centripetal force to the object.

- An equal but opposite reaction force is applied to the rope by the object.
- The force is moving away from the center of rotation.

- 2 is seen in Eq.
- There is no need for energy to keep a body rotating.

- The moment of inertia in motion is similar to mass in motion.

- Mass elements in the body are located at different distances from the center of rotation when an object is in motion.
- The sum of the moments of inertia of the mass elements in the body is the total moment of inertia.

- The moment of inertia depends on the location of the center of rotation.
- In general, the moment of inertia is calculated.
- Table A.2 shows the moments of inertia for a few objects.

- Torque is the tendency of a force to move an axis.

- Torque is produced by a force.

- The laws of movement are similar to those of movement.
- The moment of inertia is similar to mass.

- If an external Torque is not used, a body in rotation will continue its rotation with a constant angu lar velocity.

- The second law is similar to Eq.

- There is an equal and opposite reaction to every Torque.

- If there is no unbalanced external force acting on the body, it can be shown that the angular momentum of the body is conserved.

- Torques and forces can be applied to an object at the same time.
- The net effect on a body is obtained by adding forces and Torques to a body.

- When it's necessary to get the total force acting on a body, it's convenient to break it up into components.
- The two-dimensional case is illustrated in Figure A.3.
- A third axis is required for the analysis in a more general three-dimensional case.

- A rotation can be either a clockwise or a counterclockwise direction.
- The total Torque acting on a body is obtained by the addition of individual Torques each with the appropriate sign, if we designate one direction of rotation as positive and the other as negative.

- A body is in static equilibrium if it's not moving fast.

- A more rigorous definition is required in physics.
- The distance through which the force acts and the product of force are what work is defined as.

- The force is parallel to the direction of motion.
- This is shown in Figure A.4.

- The concept of energy is important.
- References to energy are found in connection with many different phenomena.

- The work was done by a force.

Study Panel

Review flashcards and saved quizzes

Getting your flashcards

Review

Quizzes

Mine

Others

Notifications

U

Profile

Mobile App

Privacy & Terms

Feedback

Need Help?

Tutorial

Log out