resistive force

resistive force

In physics, resistive force is a force, or the vector sum of numerous forces, whose direction is opposite to the motion of a body, and may refer to: Friction, during sliding and/or rolling. Drag (physics), during movement through a fluid (see fluid dynamics)

What is an example of a resistive force?

For example, a boat moving through still water experiences the resistive force of water resistance. If the water is moving in the same direction as the boat is moving but at a slower speed, the force of the water resistance is reduced.

What is the formula for resistive force?

Newton’s Second Law of Motion: The rate at which the momentum of a body changes with respect to time is equal to the resultant force acting on the body. m d v d t = F . m d v d t = m g + ( ? F R ) or m d v d t = m g ? F R , where represents this resistive force.

What are the 3 resistive forces?

We will consider three different models of resistive forces, appropriate for different situations: friction, viscosity, and drag. Friction When two solid objects slide over each other, each exerts a force on the other that is parallel to the interacting surfaces and in a direction to reduce the relative sliding.

Is resistive force negative?

Negative work in Physics usually means work done by the object such as the work done by a falling object, and positive work is the work done on the object such as lifting the object. Work done opposing the resistive force is positive, so work done by the resistive force would be negative.

How is net force calculated?

Net force is the sum of all forces acting on an object. The net force can be calculated using Newton’s second law, which states that F = ma, where: F is the net force. m is the mass of the object.

What is the resistive force of friction?

Resistive Forces These include: Friction which is a force that prevents, or tries to prevent, the slipping or sliding of two surfaces in contact. Air Resistance which acts in the opposite direction to the motion.

What is impulsive force?

An impulsive force is a force which acts on an object for a short period of time. In a collision that results in a change in the velocity or momentum of one or more the objects involved in the collision, an impulsive force is primarily produced.

What do you mean by viscous force?

1. n. [Enhanced Oil Recovery] A measure of a fluid’s resistance to flow. Viscous forces in a fluid are proportional to the rate at which the fluid velocity is changing in space; the proportionality constant is the viscosity.

What is one example of a resistant force explain why it is called resistant?

Friction and fluid resistance are resistive forces when the material is stationary. However, both can also contribute as an applied force when the materials or objects are moving relative to each other. For example, a boat moving through still water experiences the resistive force of water resistance.

What is average resistive force?

Calculating the force: F = ma = m * v/t = 0.04 * 90/t = 3.6/t = 3.6 / 0.005 [Since t = 0.005] = 720 Newtons. Thus, the average resistive force is 720 N.

Is upthrust force a contact force?

Is upthrust a contact force? Upthrust force is an example of a contact force. This is because the two objects touch for the force to be applied.

What is the magnitude of the resistive force?

If you mean electrical resistance; since voltage is equal to amperage multiplied by resistance, resistance is voltage divided by amperage. If you mean resistive forces in general; then there is usually a coefficient that is multiplied by the force being resisted to get the magnitude of the resistive force.

What’s an example of net force?

In a tug of war, a fat man pulls with a force of 100 N on a side, and a lean man pulls with 90 N on the other side. Determine the net force. Therefore, the net force is 10 N. A toy car is at rest, and a force of 70 N is applied to it.

What is net force in physics?

The net force is the vector sum of all the forces that act upon an object. That is to say, the net force is the sum of all the forces, taking into account the fact that a force is a vector and two forces of equal magnitude and opposite direction will cancel each other out.

What is an example of net force?

Definition of a Net Force

When we kick a soccer ball, then the ball takes off and moves through the air. Then, there is a net force acting on the ball. Again when the ball starts to come back to the ground and eventually stops, there is also a net force acting on the ball.

What is impulse and impulsive forces?

The product of the force & the time for which it acts on a body is called impulse of a force. The force acting on a body for short interval of time is called impulsive force.

What is impulse force Class 11?

Impulse is defined as a force multiplied by time it acts over. For example: Tennis racket strikes a ball, an impulse is applied to the ball. The racket puts a force on the ball for a short time period.

What are impulsive forces give two examples?

When a batsman plays a shot for six, a force acts on a ball through a bat for short interval of time. We call that force, an impulsive force. 2. When a bullet strikes a glass, an impulsive force acts on the glass.

What is Stokes law in physics class 11?

This law states that when a body moves in a fluid, it experience a drag force opposite to its motion and for a spherical body this drag force is proportional to the speed of the body, the coefficient of viscosity of the fluid and the radius of the sphere.

What is viscosity and viscous force?

This property of liquids is called viscosity. The force existing between the two consecutive layers of fluids due to their velocity gradient is called viscous force.

What is Newton’s law of viscosity?

Newton’s law of viscosity states that. Shear stress is directly proportional to velocity. gradient

Is drag a resistive force?

When a solid object moves through a fluid it will experience a resistive force, called the drag force, opposing its motion. The fluid may be a liquid or a gas. This force is a very complicated force that depends on both the properties of the object and the properties of the fluid.

How can you reduce resistive forces on an object?

The faster the object moves the more drag it experiences. When the fluid is air, drag is usually described as air resistance . The effects of air resistance can be reduced by streamlining the object, which will allow the moving object to go faster for the same thrust force.

14.1 Intro to resistive forces

14.2 Resistive forces – low speed case

14.3 Resistive forces – high speed case

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