The average resistance force is the change in momentum divided by the time required to stop the bullet . The distance covered under constant acceleration is 1/2 a* t^2. The average acceleration is the change in velocity divided by the time.
What’s the formula for average force?
The mass of the object multiplied by the average velocity over the definite time is equal to the average force .
How do you find the resistive force of friction?
- F R is the resulting force.
- F is the force pushing the object (F = ma)
- F r is the resistive force of friction (F r = μN)
What is resistive formula?
Resistivity, commonly symbolized by the Greek letter rho, ρ, is quantitatively equal to the resistance R of a specimen such as a wire, multiplied by its cross-sectional area A, and divided by its length l; ρ = RA/l . ... Thus, in the metre-kilogram-second system, the unit of resistivity is ohm-metre.
How do you calculate resistive force a level?
m d v d t = m g + ( − F R ) or m d v d t = m g − F R , where represents this resistive force. Note that down is assumed to be the positive direction. The resistive force is typically proportional to the body’s velocity, v, or the square of its velocity, .
Is drag a resistive force?
Unlike other resistive forces, such as dry friction, which are nearly independent of velocity, drag force depends on velocity . ... Even though the ultimate cause of a drag is viscous friction, the turbulent drag is independent of viscosity.
What are two resistive forces?
The class of forces we are interested in for this section are the group known as resistive forces. These tend to act to reduce the relative motions of two objects. We will consider three different models of resistive forces, appropriate for different situations: friction, viscosity, and drag .
What is formula for mass?
Mass is always constant for a body. One way to calculate mass: Mass = volume × density . Weight is the measure of the gravitational force acting on a mass.
What is the weight formula?
The most common definition of weight found in introductory physics textbooks defines weight as the force exerted on a body by gravity. This is often expressed in the formula W = mg , where W is the weight, m the mass of the object, and g gravitational acceleration.
How can I calculate average?
Average This is the arithmetic mean, and is calculated by adding a group of numbers and then dividing by the count of those numbers . For example, the average of 2, 3, 3, 5, 7, and 10 is 30 divided by 6, which is 5.
What is current formula?
The current is the ratio of the potential difference and the resistance. It is represented as (I). The current formula is given as I = V/R . The SI unit of current is Ampere (Amp).
What is measured in Ohm?
Resistance is a measure of the opposition to current flow in an electrical circuit. Resistance is measured in ohms, symbolized by the Greek letter omega (Ω). Ohms are named after Georg Simon Ohm (1784-1854), a German physicist who studied the relationship between voltage, current and resistance.
What is the formula to calculate resistance?
What is the resistance of the lamp? To calculate the resistance of an electrical component, an ammeter is used to measure the current and a voltmeter to measure the potential difference. The resistance can then be calculated using Ohm’s Law.
Is drag force equal to weight?
The drag force depends on the square of the velocity. So as the body accelerates its velocity and the drag increase. It quickly reaches a point where the drag is exactly equal to the weight . When drag is equal to weight, there is no net external force on the object, and the acceleration becomes zero.
Does drag force increase with speed?
Drag increases with speed (v). ... An object that is stationary with respect to the fluid will certainly not experience any drag force. Start moving and a resistive force will arise.
How do you force drag?
Drag is a mechanical force. It is generated by the interaction and contact of a solid body with a fluid (liquid or gas). It is not generated by a force field, in the sense of a gravitational field or an electromagnetic field, where one object can affect another object without being in physical contact.
