Would this be right?

Question

a) If an object is already moving, is a force necessary to keep it going at constant velocity?
yes
b) what ONE WORD goes in the blank:
An obect in motion keeps going because it has __inertia__

inertia would be best described as... (CHOOSE ALL THAT APPLY)
mass
X resistance to change in velocity
X the tendency to maintain constant velocity
the force of gravity
X resistance to acceleration
a force within the object
a property of matter

Newton's first law states: When the _net force_ on an object is zero, the object will _maintain_ constant _velocity_.

Another way of saying this is that, if the total force on it equals zero, an object's _acceleration_ will also be zero.


a) What is the net force on an object if you exert 10 N to the right, 4 N to the left, and an additional 6 N to the left?
0 N no direction

b) If the object was going 15 m/s when you began to apply the forces, how far will it go in the following 2 sec?

I understand the point of homework. Trust me, I get four hours a night, aside from this assignment. The only reason I post physics on here, is because my teacher doesn't teach any of the material. She just gives us assignments. More than half of the class is failing, and if my grade sinks in her class, I get kicked out of NHS. She should teach.

Answer 1

a) If an object is already moving, is a force necessary to keep it going at constant velocity?
yes

Technically, this is correct only if there is a gravitational force or friction acting on the object. In favourable test conditions (Such as in space), once the object is moving, it would carry on moving in the same direction with the same velocity untill such a time as another force acts upon the object. Newton's laws of physics.

Answer 2

Ok, ok I'll try to do some of your HW. But do try to understand some of the physical concepts from a good textbook on physics.
ANSWERS:

a) Yes or no. The answer depends on the physical environment. If it is in vacuum or free space it does not require any force to move at constant velocity. But on Earth it haas to overcome frictional forces. hence a constant force has to be applied just to keep it moving at constant velocity.

b) motional

c) 2 and 3

Answer 3

a) I agree with da_royal_... My answer would be no because from the way it's worded I would assume no other forces existed.

b) OK

I would add a property of matter to the list

OK

OK

the other a) OK

the other b) 30 meters - distance = velocity * time

Answer 4

the point of homework is that you go and try and work things out for yourself, not get a group of strangers to do it all for you.