Question

Give a specific example for each of the following descriptions of a possible motion:
(5 marks)
a. The velocity is constant.
b. The speed is constant, but the velocity is constantly changing.
c. The motion is in one dimension, and the total distance travelled exceeds the
magnitude of the displacement.
d. The motion is in one dimension, the average speed is greater than zero, and the average velocity is zero.
e. The is in two dimensions, the average speed is greater than zero, and the average velocity is zero.

Answer 1

@freckles @Astrophysics @agent0smith @Ghostedly @MissSmartiez @YoungStudier @ltrout @Qwertty123

Answer 2

@agent0smith do you able to help me?

Answer 3

I'm sure you can think of some of these

Answer 4

b. The speed is constant, but the velocity is constantly changing.

This could be a car driving around a corner at constant speed

Answer 5

B. Could be a going around in circles

Answer 6

@satellite73 @TheSmartOne can you please help me with c,d,e

Answer 7

@ganeshie8 @hba @rvc @josedavid @ltrout

Answer 8

For c , let a,b,c be 3 points on a line,ac>ab then when a person moves from a and reaches b and then moves to b the disp is less than distance travelled.

Answer 9

@agent0smith are you agree with him?

Answer 10

Yeah, but all you have to do is think of real-life examples that fit these descriptions. Like for d, throwing a ball that bounces off a wall and is caught again.

Answer 11

oh

Answer 12

c. The motion is in one dimension, and the total distance travelled exceeds the
magnitude of the displacement.
A back and forth swim lap. ( so you end at the same point where you began)
@agent0smith agree?

Answer 13

Yes

Answer 14

what would be the e?

Answer 15

Anything that moves in two dimensions, and ends up back where it started.

Answer 16

@agent0smith what is the different between the one dimension and two dimension?

Answer 17

One dimension means a straight line, only back and forth motion. Two dimensions would be like forward and backward, as well as left and right, or up and down.

Answer 18

so basically Two dimensions be like a circular path

Answer 19

Yes

Answer 20

well velocity is the derivative of displacement if I remember.

you can travel at a constant velocity, "try to think about this"


\[v = \frac{ dx }{ dt } = \frac{ x-x_{0} }{ t-t_{0} }\]

Answer 21

@agent0smith thanks a lot I appreciated

Answer 22

You're welcome.

Answer 23

Two kayakers can move at the same speed in calm water. One begins kayaking straight
across a river, while the other kayaks at an angle upstream in the same river to land
straight across from the starting position. Assume the speed of the kayakers is greater
than the speed of the river current. Which kayaker reaches the far side first? Explain why.

Answer 24

Didn't we do one like this yesterday? Fastest way across is to aim straight across the river. That way all their effort goes into getting across the river, not fighting the current.

Answer 25

I don't think so we did

Answer 26

Maybe it was someone else. Anyway, the answer is above.

Answer 27

well thanks again