Question

Which object is being acted on by balanced forces?
Group of answer choices

a snowflake that falls and lands on a roof

a car that moves at a constant speed in one direction

a skateboard that rolls increasingly faster down a hill

a baseball that rolls to a stop in a field

Answer 1

D or B?

Answer 2

According to Newton's laws, if the net force acting upon a body is zero, then its acceleration is also zero.
In fact, from \(\vec{F} = m\vec{a}\), we get:
\(\vec{F} = \vec{0} \implies \vec{a} = \vec{0}.\)
What does that tell us about the velocity?

Answer 3

okay so would that make my guess correct?

Answer 4

B is actually okay. Since the ball is moving in one direction, both the velocity and the speed are constant.

You should think a little bit better about D. Could the ball be rolling to a stop if its velocity were a constant?

Answer 5

I agree I think its b

Answer 6

I think so to. (:

In fact, if the ball is coming to a stop, some force must be acting upon it. In this case, that force is friction.

Answer 7

thank you