ANSWER and EXPLANATION
We want to classify the forces given as either external forces or internal forces.
An internal force is a force that does not change the mechanical energy of an object. In other words, these forces act between two different parts of an object.
An external force is a force that is due to an external agent acting outside of a body or system.
Therefore, going by these definitions, we see that the forces that are internal forces are:
- Shear
- Gravity
- Torsion
and the force that is an external force is:
- The force of the floor on your feet when you are standing.
Answer:
Correct answer: 11. Total distance d = 200m ; 12. Vav = 3.63m/s ;
13. Total displacement Dt = 0m ; 14. V₂(10s-15s) = 0 m/s ;
15. V₃(15s-40s) = 4 m/s ; 16. V₁(0s-10s) = 6 m/s > V₄(40s-55s) = 2.67 m/s
Explanation:
The whole movement can be divided into four stages.
In the first stage the subject moves 60m in a positive direction for 10s,
in the other it is stationary for 5s, in the third it moves 100m in the opposite (negative) direction for 25s and in the fourth in the positive 40m for 15s.
11. Total distance = 60 + 0 + 100 + 40 = 200m
12. The formula for calculating the average speed (velocity) is
Vav = (S₁ + S₂ + S₃ + S₄) / (t₁ + t₂ + t₃ + t₄)
Vav = (60 + 0 + 100 + 40)/ (10 + 5 + 25 + 15) = 200/55 = 3.63 m/s
13. The movement started from the origin and ended at the origin
Total displacement is zero meters.
14. The speed between 10s and 15s is zero, because he did not move.
15. V₃ = S₃/t₃ = 100/25 = 4 m/s
16. V₁ = S₁/t₁ = 60/10 = 6 m/s and V₄ = S₄/t₄ = 40/15 = 2.67 m/s
V₁ > V₄
God is with you!!!
I believe it is speed.
Hope this helps!
<h3>The correct Net force should be 2N becaues since the two forces 8N and 6N are going in different directions it would be subtraction so 8N-6N=2N . So the correct Net force is and should be 2N.</h3>
<em>I hope this helps :)!.</em>