Which of the following statements are true about the motion of an object? A forc
ID: 1592438 • Letter: W
Question
Which of the following statements are true about the motion of an object? A force perpendicular to the momentum changes the direction of the momentum but not its magnitude. To change the magnitude of the momentum you need to apply a force parallel to the momentum (either in the same direction as the momentum or the opposite direction). To make an object turn to the left, something has to exert a force to the right on the object. 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. Incorrect: Your answer is incorrect.
Explanation / Answer
A)
correct. A force perpendicular to the momentum changes the direction of the momentum but not its magnitude
As Newton's law states that linear momentum is directly proportional to the force applied. The quantity "Momentum" and "Force" are in vector form. The vector laws when applied on both of them gives this statement.
B)
correct B.To change the magnitude of the momentum you need to apply a force parallel to the momentum (either in the same direction as the momentum or the opposite direction)
It is simply vector form of Newton's second law.
C)
Incorrect C.To make an object turn to the left, something has to exert a force to the right on the object.
You said that the force should be in right, if the force is in right, the the body will turn towards right.
D)
Incorrect D.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.
The net force on the object is zero due to equality of centripetal (force towards centre) force and centrifugal force (force outwards). That is why the body remains in the same circular path of same radius.
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