A10 kg box rests on the ground. what is the weight of the box? __ n what is the normal force of the ground on the box? n the box is pushed to the left with 20 n of force, but does not move. what is the static friction force? n when the pushing force is increased to 40 n, the box just begins to move. what is the maximum static friction force? n answer choices. 30 98 40. 9.8 98. 4.1 10 20. 2

Explanation:

1. Mass of the box, m = 10 kg

Weight of an object is equal to the product of its mass and acceleration due to gravity. Its expression is given by :

W = mg

W = 98 N

2. The normal force acting on an object is equal to its weight. So, N = 98 N

3. If the box is pushed to the left with 20 N of force and it is not moving, then there is a force acting on it which is called frictional force. The static friction force have magnitude of 20 N and it is acting in opposite direction of motion.

4. When the pushing force is increased to 40 N and the box begins to move, then the maximum static frictional force is equal to applied force i.e. 40 N.

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