A horizontal force of 100 N is required to push a piece of furniture across a floor at a constant velocity. what is the net force acting on the furniture? How much is the friction force that acts on the sliding furniture? How much friction acts on the furniture when it is at rest on a horizontal surface?
If the furniture is constant velocity, there is no accelerating force (net force), so 100N equals friction force. If the furniture is at rest, there is no horizontal force. friction is an odd force, it only occurs when something is trying to move it.
constant velocity => Acceleration= 0
Net Force= m*a=0
Net force =0
130 - Friction=0
=> Friction Force= 130 kN
JGJ
To find the net force acting on the furniture, we need to consider the forces acting on it. In this case, the only force mentioned is the horizontal force of 100 N required to push the furniture at a constant velocity. Since there is no mention of any other forces, we can assume that there are no external forces acting in the horizontal direction. Therefore, the net force acting on the furniture is 100 N, in the direction of the applied force.
To determine the friction force that acts on the sliding furniture, we can use the concept of static friction. Static friction is the force that prevents two surfaces from sliding relative to each other when there is no relative motion between them. In this case, since the furniture is sliding across the floor at a constant velocity, it means that there is no relative motion between the furniture and the floor. Therefore, the static friction force is equal in magnitude and opposite in direction to the applied force.
Hence, the friction force acting on the sliding furniture is 100 N in the opposite direction of the applied force.
When the furniture is at rest on a horizontal surface, it means there is no relative motion between the furniture and the floor. Therefore, the static friction force will be equal in magnitude and opposite in direction to any external force trying to move or push the furniture. Since there are no other forces mentioned in this scenario, we can assume that the applied force is zero.
Hence, when the furniture is at rest on a horizontal surface, the static friction force will exert a force of 0 N to prevent any external force from moving the furniture.