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Capillary action
Gravity,contact force, friction, air resistance
Lift any object. Grav. force is acting down, you must apply an upward force to lift the object. Work is force applied through a distance, so work is done if you lift it, but not if you hold it still.
When you stand still . . . The sole of your shoe exerts a downward force equal to your weight against the ground. The ground exerts an upward force equal to your weight against the sole of your shoe. The net force where the sole of your shoe meets the ground is zero, which is the reason that your shoe doesn't accelerate vertically.
Work is being done by the force of gravity. When the book falls to the floor, there's a force on it, and the force keeps acting on it as it covers the distance. A force acting through a distance is the definition of work. Maybe there's nobody pushing the book, but the force of gravity is pulling it down, and it's the force of gravity that does the work on the book.
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Capillary action
Gravity is a force acting down on it. A normal force is acting perpendicular to the ground at the base of the structure.
Gravity is a force acting down on it. A normal force is acting perpendicular to the ground at the base of the structure.
The main forces acting on a bird in flight are gravity, drag caused by wind resistance as it moves through the air, and lift produced by the motion of its wings that keep it up. A bird on the ground is mostly just affected by gravity.
The weight of the crate is acting downward on the ground and the ground is exerting a force equal to the weight of the crate upward on the crate.
The weight of the crate is acting downward on the ground and the ground is exerting a force equal to the weight of the crate upward on the crate.
Gravity
work
work
work