What force is required to keep mass m = 20 kg
moving with a constant speed along straight line?
No force required
Two boxes have the same size, but one box is empty and the other has books inside.
The same force is applied to each box. What box will have the bigger acceleration?
Box with books
Boxes will have the same acceleration
Impossible to make a conclussion
According to the Second Newton's Law,
if you drop the ball it will fall down with acceleration
(because of gravity force).
Gravity on a Moon is less than on Earth.
If you drop the same ball on the Earth and on the Moon
acceleration on the Earth will be bigger than on the Moon
acceleration on the Earth will be less than on the Moon
acceleration will be the same on the Earth and on the Moon
ball will not fall down on the Moon
50 N directed horizontally
50 N directed down
50 N directed up
There is no surface reaction because monitor doesn't move
Imagine a book on the horizontal surface. without motion (at rest).
Gravity force pushing the book down with force 10 N,
but the book is remaining on the surface without motion (at rest).
What is the Net Force applying to the box?
The Net Force is 10 N and directed up
The Net Force is 10 N and directed down
The Net Force is 20 N
The Net Force is zero
Following two forces applying to the object:
one 30 N to the right (------------------->)
another 10 N to the left (<-----)
What is the Net Force?
-----> 10 N
----------> 20 N
---------------> 30 N
10 N <-----
This solution explains how to solve several problems dealing with forces.