Question

Which of the following statements are true about the motion of an object?

a. To change the magnitude of the momentum you need to apply a force with a component parallel to the momentum (either in the same direction as the momentum or the opposite direction).
b. A force perpendicular to the momentum changes the direction of the momentum but not its magnitude.
c. When an object moves at constant speed along a curving path, the net force on the object must act straight outward from the center of the kissing circle.
d. To make an object turn to the left, something has to exert a force to the right on the object.

Answer 1

Answer: B

Explanation: A force perpendicular to the momentum changes the direction of the momentum but not its magnitude.

Answer 2

a. To change the magnitude of the momentum you need to apply a force with a component parallel to the momentum (either in the same direction as the momentum or the opposite direction).

d. To make an object turn to the left, something has to exert a force to the right on the object.

Step-by-step explanation:

For motion along a circle or curve, the net force on the particle must be parallel with the change in momentum.

This change in momentum of the system is given by;

`\delta P_(sys) = F_(net) \delta t`

Thus, option A is correct.

a. To change the magnitude of the momentum you need to apply a force with a component parallel to the momentum (either in the same direction as the momentum or the opposite direction).

Also, applying the principle of torque, to make an object turn to the left, something has to exert a force to the right on the object.

Option D is also correct.