The tension in a pendulum that is pushed from its equilibrium position does non-

Question

The tension in a pendulum that is pushed from its equilibrium position does non-zero work because it is perpendicular to the displacement. The total linear momentum of a system may be conserved even when the mechanical energy of the system is not. For the total linear momentum of a system to be conserved, the net external forces acting on the system must be zero. If the total work done on a particle was not zero, then its kinetic energy must have changed. The potential energy function U is associated with the conservative internal forces. If ONLY conservative forces (like the gravitational force) act on a particle, the velocity of the particle cannot change. The apparent weight of an object is determined only from the mass of the object, and not from the normal force. The purpose of the antilock bricking systems ABS is to help drivers to better maintain control of their automobiles and maximize stopping distance. The Normal Force is always equal to mg. Compressing a given spring 2.0 cm from its unstressed length takes the same work as stretching it 2.0 cm from its unstressed length.

Explanation / Answer

1) False:

We know that,

W = F x D cos(theta)

theta = 90 deg

Hence, W = 0

2)True

We know that in inealstic collision only momentum is conserved but energy is not conserved.

3)True

For momentum to be conserved the no external force should be there to they should sum to zero.

4)True

There must be change in energy, it may be a change of PE or KE. Since the statement does not talk about the position and velocity of the object but it just stated that the energy is not constant and KE is changing, so we may assume that the speed change of the particle may lead to the change in energy.

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