Question

You are skateboarding and push back with one leg, and, as a result, the skateboard moves forward. Which law of motion is being described in this scenario? a. Law of Inertia b. Newton's Second Law of Motion <-- What i picked, am i right? c. Newton's Third Law of Motion d. Newton's First Law of Motion

Answer 1

b and c i think..

Answer 2

Haha, so weird. All of them take place, assuming we're saying this happens in reality! All of them.

But I think the prompt emphasizes Newton's Third Law most. The skateboarder pushes on the ground, and the ground pushes him (forward).

Answer 3

the skateboarder is in acceleration due to the force from ground...thats 2nd law...

Answer 4

The force he exerts DEFINATELY decides how much he accelerates, according to his unmentioned mass, and the skateboard's mass and rolling friction. But this aspect isn't so highlighted, not mentioning acceleration or its relation with mass.

Again, I'd choose all of them, but I think it's the third if you must pick one.

And I think A and D are one-in-the-same, according to people on the internet.

Answer 5

I stated my case for the second and third of Newton's laws, I'll throw in a case for the first.

When the skateboarder and his skateboard experience the forces that arise because the skateboarder pushed, they move. That skateboarder and skateboard presumably stayed at rest until an external force was applied! It's external, according to the skateboarder and board.

Answer 6

@loli124555 and @souvik, what do you think, if you have to chose just one? And @loli124555, do you see how, in real life, all these laws are true?

Answer 7

So it's The Third law?

Answer 8

if i have to choose only one i would choose Newton's third law of motion..

Answer 9

I guess we agree third is the most likely answer... Sounds like it could be made into an essay question: "describe how these laws apply"!

Answer 10

What is power?

the magnitude of a force needed to move an object

how much work can be done in a given time

the distance over time that an object moves

the energy needed to create work

Answer 11

Haha, you could ask another question! Might get more people to look at it.

That said, power is, often, the work done by something over time.

Answer 12

You could Google "define power physics" to see that, too. For many definition questions, Google searches will help you learn.