physics

posted by .

a 4kg box sits, at rest,on the table what is the box's acceleration? b)how much does the box weight? c) what other force acts on the box? how big is this force?

  • physics -

    If it is "at rest" that implies it is sitting there not moving therefor not accelerating. Weight is simply mass x gravity (W=mg) where g~9.81(m/s^2). Newtons Second law Net Force = mass x acceleration (F=ma) reveals if the box has a downward force of W, and is not moving, there must be an equal but opposite force to hold it here. The table exerts this force commonly called N. So if F=ma and a is zero n-mg=0 so n=mg.

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. physics

    A box is resting on a table frictionless). Determine the weight of the box and the normal force acting on it. (a) If the box was pushed down, with a force of 40N, determine again the normal force acting on the box. (b) If the box was …
  2. physics

    A box,is resting on a smooth(frictionless)table.The mass of the box is 10 kg. (a)Determine the weight of the box and the normal force acting on(b)If the box is pushed down with a force of 40 Newton determine the normal force(c) If …
  3. Physics

    You drag a heavy box along a rough horixontal floor by a horizontal rope. Identify the reaction force to each ofthe follwing forces: A) the pull of the tope on the box. B) the friction force on the box C) the normal force on the box, …
  4. Physics

    A box of mass m1 = 10.0 kg rests on a smooth, horizontal floor next to a box of mass m2 = 5.0kg. You push on the box 1 with a horizontal force of F = 31.8 N: a.)What net force on box 2 will cause it to have this acceleration?
  5. Physics

    ohh sorry, in my first question... A 15 kg box sits on a horizontal FORCE. the coefficient of static fricition between the box and the surface is 0.70. if a force P is exerted on the box at an angle directed 37 degrees below the horizontal, …
  6. Physics-forces

    1. a force of 250N is used to push a heavy box down the street. If the force of friction between the box and the street is 195N and the box has a mass of 60kg, what is the accleration of the box?
  7. mechanics

    A 2kg box sits at rest on a level floor. Two children push on the box at the same time. Eli pushes horizontally to the right on the box with a force of 4N. Jamie pushes straight downward on the box with a force of 3N. The box does …
  8. Physics

    In the picture to the right, a ring pulls a box of mass m = 5.0 kg across a level table. The string pulls with a tension F = 25.0 N at an angle θ = 25˚ above the horizontal. A frictional force of 4.0 N also acts on the box. …
  9. Physics

    A 7.5 kg box is on a table. What is the normal force acting on the box in each of the following situations?
  10. Physics

    A box is pushed across a horizontal table by a boy applying a force of 32 N to the box. A force of friction of magnitude 19 N acts opposite the direction of motion. A stiff wind also opposes the box’s motion. What force does the …

More Similar Questions