Question

If a force has a negative value, such as −100 N, that means the force
a. is less than 100 N in strength.
b. acts in the opposite direction from a +100 N force.
c. is a normal force.

Answer 1

Ok, What do you think it should be?

Answer 2

b

Answer 3

YEs, that's correct........sign indicates the direction.

Answer 4

A train is climbing a gradual hill. The weight of the train creates a
downhill force of 150,000 newtons. Friction creates an additional force of
25,000 newtons acting in the same direction (downhill) (Figure 5.23).
How much force does the train’s engine need to create so the train is in
equilibrium (going uphill at constant speed)?

Answer 5

Engine will require to produce a force equal and opposite to the total downhill force.

Answer 6

175,000 N in opposite direction

Answer 7

actually just 175,000 N

Answer 8

Yes..

Answer 9

in uphill direction.

Answer 10

last one please

Answer 11

A child weighing 200 newtons is sitting in the center of a swing. The
swing is supported evenly by two ropes, one on each side. What is the
tension force in one of the ropes?

Answer 12

i think answer is 200/2 = 100N so 100N per rope

Answer 13

Very Good, that's correct..

Answer 14

thx so much actually one more thing im sorry

Answer 15

you ok with that

Answer 16

yes yes

Answer 17

Draw a free body diagram of your own body sitting on a chair. Include all
forces acting on your body.

Answer 18

if its not possible for you to answer this question through openstudy then thx anyway

Answer 19

Give me a minute....

Answer 20

Ok, I am back...so first of all do you know what is free body diagram (FBD) ?

Answer 21

i see it here in the text book but i have no idea how to make a correct one myself here take a look at what im looking at scroll down till you see 5.3 section review http://iqa.evergreenps.org/science/textbooks/fps/chapters/chapter_5.pdf

Answer 22

page 129

Answer 23

diagram is on 127 though

Answer 24

Ok, lemme tell you it simply...
By definition,

A free body diagram is a graphic, dematerialized, symbolic representation of the body (structure, element or segment of an element) in which all connecting "pieces" have been removed. A FBD is a convenient method to model the structure, structural element, or segment that is under scrutiny.

So now let's see how to drw it for the situation given in the question..

Answer 25

How many forces of you can think that are acting on your body while you are sitting on the chair?

Gravitational force downwards, Normal force upwards, any more?

Answer 26

so its my weight converted to N and drawn like the picture as the answer

Answer 27

Yep

Answer 28

thx so much for helping me today i had the whole winter break but i waited to the last day to do my work your a lifesaver

Answer 29

Normal force is always equal to your weight and acts in opp direction of your weight.

Answer 30

Ur welcome :)