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Chapter 2: Q2-7 (page 82)

A ball moves in the direction of the arrow labelled cin Figure 2.53The ball is struck by a stick that briefly exerts a force on the ball in the direction of the arrow labelled e. Which arrow best describes the direction of ∆p, the change in the ball's momentum?

Short Answer

Expert verified

The correct direction of the ball's momentum change is e.

Step by step solution

01

Action of force applied perpendicularly on a moving object

When a body moves in a specific direction at a specific velocity and an external force acts on it in a perpendicular direction to its motion, the body's speed remains constant but its direction of motion changes.

02

Represent the situation diagrammatically

  • The body's motion is circular in this case, and the velocity vector is always tangential to the circular path on which it moves.

  • In this example, a force acted on the body in an inward direction, which is responsible for the body's circular trajectory.

  • The direction of velocity change is the same as the direction of momentum change.

  • The force applied by the stick and the ball's initial velocity are depicted in the diagram below.

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