The weight is approx 10.79 Newtons. The acceleration is approx 1.02 metres per second per second.
acceleration = 9.09090909091 m/s2
Weight is the mass of an object times the gravitational acceleration it undergoes. The gravitational acceleration of Earth is approximately 9.8 m/s^2. So in this case 70/9.8 = 7.14 kg
The weight is approx 1.75*9.81 = 17.17 Newtons.
Elements
It is approx 165 Newtons. It must be a seriously heavy book!
A millinewton. Not a gram or kilogram since they are units for measuring mass which is not the same as weight.
You are using your muscles to apply an upward force to the book equal to its weight. That force is equal in magnitude to the downward force on the book due to the gravitational attraction of the earth, and opposite in direction. Since equal and opposite forces are applied to the book, the net force on it is zero, and its acceleration is zero ===> if it began motionless, it remains motionless.
2.2
To get an acceleration, there has to be a net force - and conversely, if there is a net force, there is acceleration. In many common situations, there are two or more forces that cancel one another - the vector sum of the forces is zero, and therefore there is (by definition) no net force, and no acceleration. Here is one example. A book lies on the table. Gravity pulls the book down, but the book doesn't accelerate downward. What is the counter-force? It has to be the table pushing the book up. (Of course, by Newton's Third Law, if the book pushes down against the table, then the table pushes up against the book.)
A book setting on the table. The force of gravity is balanced by the equal and opposite force of the table holding the bookk. No acceleration of the book due to those forces.
Gravitational force (weight), pointing down.Reaction force, equal to the gravitational force (weight), exerted by the tabletop, pointing up.
The book slides with constant velocity.
a force is applied to the book, but there is no movement.
The book has a weight/force of 3.43 newtons or 0.8 pounds (rounded).
If the forces are balanced, this implies that the net force on the book is 0. Therefore, using Newton's second law, F = ma, F = 0, and since the mass of the book is non-zero, a = 0. This means that the book is not accelerating in the direction of these forces. However, this DOES NOT mean that the book is stationary; it could be travelling at any CONSTANT velocity (since there is no acceleration).
The formula for force is Force= Mass x Acceleration. Therefore, you have to use a greater force to move the refrigerator because it has a greater mass than the book.
yep
Usually any learner would get a doubt regarding the force acting on a body. There are many situations. 1: If a force constantly acts on a body, then it will be accelerated. So its speed would go on increasing if it starts from rest. 2: If a force acts on a uniformly moving body opposite to the direction of motion, then the speed of the body would go on decreasing and it comes to stop. Yet the force is in action, then the body would get accelerated in the other direction. 3: If a force is applied in such a way that it is balanced by an equal and opposite force, then neither acceleration nor retardation is possible. Yet the body could be got moved through some displacement. In such a case we compute only the amount of work done by that applied force. Examples: a) Lifting a book against its gravitational weight. b) Dragging an object on the floor exerting a force which equals to the force of friction between the object and the floor. Even in the earlier case work is said to be done by the force and that work performed will be available as kinetic energy in the moving system. But in latter case the energy spent would be available as potential energy in case of lifting and heat energy in case of dragging.