Force Calculation: Incorrect Result

In summary, the jet fighter plane is being launched from rest with a thrust of 2.10 * 10^5 N and after traveling 90 m, it has a kinetic energy of 4.20 * 10^7 J. The work done on the jet by the catapult is 4.20 * 10^7 J.
  • #1
Alexandra Fabiello
42
1
Homework Statement
Jet fighter planes are launched from aircraft carriers with the aid of their own engines and a catapult. If in the process of being launched from rest, the thrust of a jet's engines is 2.10 * 10^5 N and after moving through a distance of 90 m the plane lifts off with a kinetic energy of 4.20 * 10^7 J, what is the work done on the jet by the catapult?
Relevant Equations
Work total = change in kinetic energy
force = change in kinetic energy / change in distance
force = 4.2e7 J/90 m = 466666.6667 N
this minus 2.10e5 = 2.57e5 N rounded
This is incorrect, so I'm probably missing a formula or something.
 
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  • #2
Alexandra Fabiello said:
Homework Statement: Jet fighter planes are launched from aircraft carriers with the aid of their own engines and a catapult. If in the process of being launched from rest, the thrust of a jet's engines is 2.10 * 10^5 N and after moving through a distance of 90 m the plane lifts off with a kinetic energy of 4.20 * 10^7 J, what is the work done on the jet by the catapult?
Homework Equations: Work total = change in kinetic energy
force = change in kinetic energy / change in distance

force = 4.2e7 J/90 m = 466666.6667 N
this minus 2.10e5 = 2.57e5 N rounded
This is incorrect, so I'm probably missing a formula or something.
You are asked for the work done, not the force.
 
  • #3
haruspex said:
You are asked for the work done, not the force.

Whoops, I mixed up 'change in kinetic energy' with force somehow.

Thanks, that worked!
 

FAQ: Force Calculation: Incorrect Result

Why am I getting an incorrect result for my force calculation?

There could be several reasons for an incorrect result in force calculation. Some possible reasons include using the wrong formula or equation, incorrect input values, or errors in units conversion.

How can I ensure accurate results in my force calculation?

To ensure accurate results in force calculation, make sure you are using the correct formula or equation for the given scenario. Double-check your input values and units to ensure they are correct. It is also helpful to check your calculations using different methods or equations.

What is the difference between weight and force in a calculation?

Weight is a type of force that is caused by the gravitational interaction between two objects. It is often measured in units of mass, such as pounds or kilograms. Force, on the other hand, is a more general term that can refer to any type of push or pull on an object. It is measured in units of newtons.

How does Newton's Second Law of Motion apply to force calculation?

Newton's Second Law of Motion states that the acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass. This means that the greater the force applied to an object, the greater its acceleration will be, and the larger the mass of an object, the less it will accelerate for a given force. This law is often used in force calculations.

Can I use force calculation to predict the motion of an object?

Yes, force calculation can be used to predict the motion of an object. By calculating the net force acting on an object, you can determine its acceleration, which in turn can be used to predict its future position and velocity. This is the basis of Newton's Laws of Motion and is frequently used in physics and engineering applications.

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