A basketball player dribbling down the court usually keeps his eyes fixed on the players around him. He is moving fast. Why doesn’t he need to keep his eyes on the ball?
A basketball player always keeps his eyes on the other players around him instead of looking at the ball while dribbling down the court.
A frame of reference is a collection of coordinates used to indicate the relationship between a moving observer and an event. The frame of reference is further classified into the inertial and the non-inertial frames of reference.
When the basketball player gets the ball and dribbles down the court, the relative speed of the ball and the player is equal.
The frame of reference is also the same, while the player fixed his eyes on the players around him as the players around him keep their eyes on the ball, and this helps him to move fast.
If proper practice is done, it is not necessary for a good player to look at the ball while moving fast.
A cloud of dirt falls from the bed of a moving truck. It strikes the ground directly below the end of the truck. What is the direction of its velocity relative to the truck just before it hits? Is this the same as the direction of its velocity relative to ground just before it hits? Explain your answers.
Solve the following problem using analytical techniques: Suppose you walk straight west and then straight north. How far are you from your starting point, and what is the compass direction of a line connecting your starting point to your final position? (If you represent the two legs of the walk as vector displacements and , as in Figure, then this problem asks you to find their sum .)
The two displacements and add to give a total displacement having magnitude and direction .
Note that you can also solve this graphically. Discuss why the analytical technique for solving this problem is potentially more accurate than the graphical technique.
Answer the following questions for projectile motion on level ground assuming negligible air resistance (the initial angle being neither \(0^\circ \) nor \(90^\circ \)):
(a) Is the acceleration ever zero?
(b) Is the acceleration ever in the same direction as a component of velocity?
(c) Is the acceleration ever opposite in direction to a component of velocity?
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