# Why it is difficult to open a door by pushing or pulling it near the hinge?

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## Why it is easy to close or open the door by pulling or pushing it at its axis?

If you apply a force near the axis of rotation, the torque would be small because the distance is small. If you apply the same force farther away from the axis, the torque is larger. Hence, the door opens easily with less effort.

## Why it is easier to open a door by pushing it in its edge?

It is easier to open a door by holding it from its edge as the displacement from the edge to the hinge of the door is the maximum, which gives a larger moment of force with a small force applied by us, hence, the door opens with lesser effort as compared to the case when we open the door by holding it from anywhere …

## Why it is easier to open a door if you pull perpendicularly to the door instead of pulling at an angle?

The reason is because of torque which basically creates a rotational effect. … As distance increases, torque increases and so the rotational effect increases. Hence, it is easier to push open a door by holding the knob than by pushing closer to the hinge.

## What is needed to open a shut door?

Tools for Unlocking a Door

The non-locking side of the door should have a small hole on the face of the knob. Hidden inside the hole is a small button that must be pushed to unlock the door. You simply need a straight, stiff tool to unlock it. Try using a straightened paperclip or a tiny eyeglass-repair screwdriver.

## Why don’t we put door handles in the center of the door physics?

Explanation: if we put the the door handles in the center of the door then we need to large force and also our force get separate. If we decrease the distance between handle and door fixed point then we need large force to pull or push it.

## Is it easier to push or pull a door?

When pulling a door, the same forces apply, except force is applied to the knob and pulled onto the knob which then applies force to the door. … Thus due to the loss of momentum, pushing a door seems easier than pulling a door, but if one were to push a door without momentum, it would be almost as easy.

## What force happens when you open a door?

Opening a door requires our hand to apply force by pushing and pulling which is a contact force. There is some frictional force in the door hinge, against that we apply force. The hinge friction is again a contact force.

## How much torque is required to open a door?

For instance, a door with a symmetrical torque hinge may require 60 lb of force to fully open it. A counterbalance hinge, such as one of Southco’s CB Counterbalance Hinge series, could lower that to 3 lb. In the past, many engineers went with gas struts to provide the counterbalancing force rather than the hinges.

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