Question

When a car is traveling under uniformly accelerated motion, its linear momentum is

conserved

2. For a car turning in a sharp turn with a constant speed of 60 mph, its total acceleration

is equal to 0.

3. If a body is undertaking fixed axis rotation, a point that matches the axis of the rotation

will have linear velocity equal to zero.

4. If a body is undertaking fixed axis rotation, a point that matches the axis of the rotation

will have total linear acceleration equal to zero.

5. For a body that is going through rectilinear translation, the velocities of two random

particles belonging on that are always equal.

6. For a satellite that travels in circular orbit around the earth with its engines off, its speed

remains constant.

7. Conservation of angular momentum is a concept that can only be applied in cases of

satellites or other objects in orbit.

8. If a man weights 80kg in the surface of the Earth, his weight in the surface of the moon

will be lower, equal or higher?

9. In the case of general plane motion, for two particles of a rigid body always have the

same velocities

10. Two pulleys A and B with rA > rB are rotating connected to the same belt. That means

that ωA = ωΒ

True or False with a short explanation thank you.

Answer 1

1. In in order for a particle to have a uniform acceleration a constant force must be applied and as we know that if the system has the net force the momentum is not conserved. (FALSE)

2. As the car turns the direction of velocity changes with time so body has a net acceleration not equal to zero (even if body has constant speed). (FALSE)

3. Linear velocity is given by the product of angular velocity and radius vector of point from axis of rotation. so for the point on the axis itself the radius vector is equal to zero that means the point has a net zero linear velocity. (True)

4. Because the point located on the axis of rotation itself has no motion so it has zero acceleration.( True)

5. Because going with rectilinear translation that means it has no rotation hence velocity of two particle on body will have same velocity. (True)

6. Because the force on satellite moving in circular orbit is always perpendicular to its velocity so it's velocity remains constant and only its direction changes. (TRUE).

7. Conservation of angular momentum holds if the net torque on any rigid body is zero. It doesn't matter if the body is moving in in orbit or not. (FALSE)

8. Weight of any body is the the gravitational force applied by the planet on the body. So because the moon apply a smaller gravitational pull so body will have less weight. (Lower)

9. aur general plane motion the body might have rotation that's why two particle on body may or may not have similar velocity. (False)

10. Because belt is in contact with outer part of pullies so outer part of pullies will have same linear velocity that means the not havpullies will equal angular velocity because radius of two Pulley are different. (False)