When you apply a force on a body it must move True or false?

When you apply a force on a body it must move True or false?

Answer: False. If no external force is applied on the body, then there must be two equal and opposite forces acting on the body.

Why does friction occur?

Friction occurs because no surface is perfectly smooth. Rougher surfaces have more friction between them. Heavier objects also have more friction because they press together with greater force. Friction produces heat because it causes the molecules on rubbing surfaces to move faster and have more energy.

When we walk on the ground friction acts along the direction of motion True or false?

We push the ground in the opposite direction of our motion so the friction acts in the direction of motion. The simple understanding is that, due to this friction force only,which is acting along the direction of motion, we are able to walk. Else, there is no other force which is pushing us forward.

Is it possible to build a perpetual motion machine quizlet?

It is possible to build a perpetual motion machine. All machines which involve motion convert energy from one form to another.

Why is perpetual motion impossible?

A perpetual motion machine of the first kind produces work without the input of energy. It thus violates the first law of thermodynamics: the law of conservation of energy. This conversion of heat into useful work, without any side effect, is impossible, according to the second law of thermodynamics.

What friction force must be overcome to set an object in motion?

Friction is created when two surfaces slide one on top of the other. Since this consumes additional energy, this so-called sliding friction is considered an irksome yet inevitable aspect of dynamic processes. However, to set a stationary object in motion, its static friction must be overcome first.

How is friction force Minimised?

By polishing the surface, as polishing makes the surface smooth and friction can be reduced. Using lubricants such as oil or grease can reduce the friction between the surfaces. When objects are rolled over the surface, the friction between the rolled object and surface can be reduced by using ball bearings.

Is it possible to have no friction?

The coefficient of friction depends on the objects that are causing friction. The value is usually between 0 and 1 but can be greater than 1. A value of 0 means there is no friction at all between the objects; such is possible with Superfluidity.

What is fluid friction?

Fluid friction occurs between fluid layers that are moving relative to each other. This internal resistance to flow is named viscosity. In everyday terms, the viscosity of a fluid is described as its “thickness”.

What are 2 types of friction?

There are two main types of friction, static friction and kinetic friction. Static friction operates between two surfaces that aren’t moving relative to each other, while kinetic friction acts between objects in motion.