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How are the direction of an objects motion and the direction that friction acts related?

Friction always acts in a direction opposite to the direction of motion. When to push or pull an object, friction manifests in a direction opposite to motion and the frictional force is dependent on the characteristics of the surfaces. When the push or pull force is slowly increased, at a certain point the frictional force is overcome and the object starts moving.

Which force do not work on the body on which it acts?

frictional force

Explain how frictional force is used to reduce the speed of a moving object?

Friction is a force that always acts in a direction opposite to that of motion. So the frictional force does negative work on the velocity of an object ( thus reducing the speed of an object).

Describe each force that are acting on a moving object?

forces of body depends on the path it is moving for example if it is moving in straight path it under go forces like frictional forces and forces applied on it if the body is moving in slant path it has frictional force,acceleration due to to gravity(which acts down wards)

How many plus and minus are there in frictional force?

Only one minus: the frictional force acts in the direction opposite to that of motion.

Which dtrection does frictional force acts always?

It always acts opposite to the direction of friction

What is the name of the force that always acts against the direction of movement?

In geneal frictional force. If it rubs against a surface then it is known to be friction. If it drags the moving body then it is said to be viscous drag.

Which force acts against speed?

Frictional force acts against speed of any object.

Does friction cause the speed of moving objects to increase?

No, the force of friction always acts in the direction opposite to that of the motions.

The name of the force that slows any moving object?

During motion, the force of friction acts to resist further movement of objects. Such objects are always in contact with others or through air.

What is the frictional force if you don't have the coefficient of friction but know that a downward force of 60 N at 10 degrees below the horizontal keeps the object moving at a constant speed?

If the speed is constant the frictional force must be equal to the propelling force (which is gravity in this case) as any imbalance of forces creates an acceleration. If the 60N is in the same direction as the movement, then the frictional force is also 60N. If 60N is the gravitational force, you'll have to use the angle to calculate the propelling force that acts in the direction of movement. Again, the frictional force will be exactly the same as the propelling force in the direction of movement (only in magnitude, though - the direction of the frictional force (the vector) will be in the opposite direction).

The inward force needed to keep an object moving in a circle?

The force that keeps objects moving in a circle is known as the centripetal force, which acts towards the center. The velocity of the object moving in a circle will be tangential to the circle.