Does power depend on time?
depends on the situation. But, in general, it is not an equation for average power. if, for example, during a certain time period, the velocity or the force change value, then the power changes value too.
What effect does time have on power?
In calculus terms, power is the derivative of work with respect to time. If work is done faster, power is higher. If work is done slower, power is smaller. Since work is force times displacement (W=F*d), and velocity is displacement over time (v=d/t), power equals force times velocity: P = F*v.
How does power depend on time taken explain?
Power can be expressed as P = Work/Change in Time, instead of P = Change in Energy/Change in Time, because the change in energy is basically the work done. In both cases you end up with joules / time.
Is power inversely proportional to time?
Power is the rate at which work is performed determined by how long it takes to perform the work. Power is then directly proportional to the work done and inversely proportional to the time to do the work. Remembering that work is force times displacement (W = F*d), you can derive a corollary for the power equation.
What is the relationship between work and power?
Work is the energy needed to apply a force to move an object a particular distance, where force is parallel to the displacement. Power is the rate at which that work is done.
Is work directly proportional to time?
Why is work not force times time?
So the natural definition of work is to say that work is the force applied multiplied by the distance that that force acts through, times the distance that is travelled, added up along the whole path of motion. In fact, force multiplied by time wouldn’t even have the units of energy.
Is power directly proportional to resistance?
Here, we can see that the electric power is directly proportional to resistance on keeping I constant. When power increases, the resistance also increases, while keeping current I constant. However, when the resistance in the circuit decreases, power in the circuit also decreases, while keeping current I constant.
What is work directly proportional to?
Work is directly proportional to the first two factors: force and displacement.
What is an example of directly proportional?
The relationship between days and hours is another example of a direct proportionality: time (hr) = 24 × time (days) . Now we combine the direct proportionality for minutes and hours, with the direct proportionality for hours and days: time (min) = 60 × time (hr) = 60 × ( 24 × time (days) ) .
Is proportional to symbol?
∝
Can work be done on a system without motion?
Can work be done on a system if there is no motion? No, because of the way work is defined. Does the centripetal force acting on an object do work on the object?
Is work done ?( Yes or no?
NO WORK IS DONE if the force you exert does not make the object move. Work is done when the force (F) applied to the object causes the object to have a displacement (d) in the same direction as the force applied. 6. A GIRL IS PULLING HER TOY CAR • Yes, the situation is an example of work.
Is it possible for a system to have negative energy?
B Is it possible for a system to have negative potential energy? Yes, since the choice of the zero of potential energy is arbitrary. C) No, because the kinetic energy of a system must equal its potential energy.
Is it possible for a system to have energy if nothing is moving in the system?
Is it possible for a system to have energy if nothing is moving in the system? Yes. A system that has all its energy in the form of potential energy is such a system. Potential energy depends on position relative to a reference point.
Why is kinetic energy not negative?
Kinetic energy can’t be negative, although the change in kinetic energy Δ K \Delta K ΔK can be negative. Because mass can’t be negative and the square of speed gives a non-negative number, kinetic energy can’t be negative.
When energy is stored What is it called?
Potential energy
What would possibly occur if there is no flow of energy in a system?
The Second Law of Thermodynamics states that “in all energy exchanges, if no energy enters or leaves the system, the potential energy of the state will always be less than that of the initial state.” This is also commonly referred to as entropy. In the process of energy transfer, some energy will dissipate as heat.
What is energy of movement?
Kinetic energy is the energy of motion. All moving objects have kinetic energy. When an object is in motion, it changes its position by moving in a direction: up, down, forward, or backward. Potential energy is stored energy.
What abilities do you have working?
Mechanical Energy as the Ability to Do Work. An object that possesses mechanical energy is able to do work. In fact, mechanical energy is often defined as the ability to do work. Any object that possesses mechanical energy – whether it is in the form of potential energy or kinetic energy – is able to do work.