Physics 12: Power Output Calculation for Accelerating Object

In summary, the conversation discusses the calculation of power output for an object with a mass of 5.0 kg that is accelerated from rest to 6.0 m/s over a distance of 2.0 m on a level surface. The force of friction is given as 4.0 N. After using the equation d=vt to find the time of 0.33 seconds, the power output is calculated using the equation P=Fd/t, resulting in 270 Watts. The role of a v-t graph is not applicable in this case since the object is accelerating. A kinematics equation must be used to find the time.
  • #1
gdhillon
16
0
A 5.0 kg object is accelerated from rest to 6.0 m/s while moving 2.0 m across a level
surface. If the force of friction is 4.0 N, calculate the power output



I used d=vt to find the time which was .33sec then i put that into P=Fd/t and had (49-4)(2)/.35 and got 270 Watts
 
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  • #2
Cool - was there a question in all that?
Is there some role the v-t graph could play?
 
Last edited:
  • #3
d = vt is applicable only for constant velocities. The object is accelerating in this case. You must use a kinematics equation to find the time - you know the initial and final velocities, and the distance traveled.
 

FAQ: Physics 12: Power Output Calculation for Accelerating Object

What is impulse in physics?

Impulse in physics refers to the change in momentum of an object caused by a force acting on it for a certain amount of time. It is calculated as the product of force and time, and is measured in units of Newton seconds (N·s).

How is impulse related to momentum?

Impulse and momentum are closely related, as impulse is the change in momentum of an object. In other words, the impulse acting on an object is equal to the change in momentum of that object. This relationship can be expressed as the impulse-momentum theorem: FΔt = mΔv, where F is the force, Δt is the time interval, m is the mass, and Δv is the change in velocity.

What is the difference between impulse and impact?

Impulse and impact are often used interchangeably, but they have distinct meanings in physics. Impulse refers to the change in momentum of an object caused by a force acting on it, while impact refers to the collision between two objects. In other words, impulse is the cause of impact, while impact is the result of impulse.

What are some real-life applications of impulse?

Impulse has many practical applications, such as in sports. For example, in baseball, a player can increase the distance the ball will travel by increasing the impulse on the ball with a stronger swing. In addition, impulse is also important in car safety, as airbags are designed to increase the time interval of a collision, reducing the impact force and therefore the impulse on the driver and passengers.

How does the impulse-momentum theorem relate to Newton's Second Law?

The impulse-momentum theorem is essentially a restatement of Newton's Second Law of Motion, which states that the net force acting on an object is equal to the rate of change of its momentum. In terms of impulse, this can be written as F = mΔv/Δt, where F is the net force, m is the mass, Δv is the change in velocity, and Δt is the time interval.

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