1st - if you slide a book across a table, it will eventually slow to a stop because of the opposite force friction is exerting or it will come to a stop once it hits the wall.
2nd - It's easier to push an empty box than a box thats halfway full because the empty box has less mass. So more force is needed to move the filled box.
3rd - When jumping off a diving board, the springboard is pushed down by your body weight and then it springs back up, pushing you into the air.
Answer:
Overall net force is <u>zero</u>.
Explanation:
Given:
Susan exercise for 1 hour at constant velocity and constant speed.
So, there is no change in the velocity for 1 hour.
We know that, acceleration is the quantity that measures the change in velocity over a given time interval. If there is no change in velocity or if velocity remains constant for a given time interval, then the acceleration of the body is zero.
Now, from Newton's second law, we know that, the net force acting on a body is directly proportional to its acceleration. Therefore, for a body to experience zero acceleration means that the body will have zero net force.
Susan here exercises at constant velocity and so, her net acceleration is zero. Therefore, the overall net force acting on her will also be zero as net force is directly proportional to the acceleration.
I think it’s C sorry if it’s wrong :(
Answer:
loudness of a sound varies with area of a vibrating body.
Explanation:
when a tuning fork is pressed against a rubber pad a feeble sound is heard because of the smaller area of pad but when a vibrating tuning fork is placed vertically on the table the surface area increases and so the loudness of a sound increases.