Net Force of a Rocket and Acceleration

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SUMMARY

The net force acting on an 8.0 kg rocket, which experiences a thrust of 100 N and air resistance of 4.9 N, is calculated to be 95.1 N. This is derived from the equation F_net = thrust - air resistance, resulting in 100 N - 4.9 N = 95.1 N. Consequently, the rocket's acceleration is determined using the formula F = MA, yielding an acceleration of approximately 11.89 m/s² when applying the net force to the mass of the rocket.

PREREQUISITES
  • Understanding of Newton's Second Law of Motion (F=MA)
  • Basic knowledge of forces including thrust and air resistance
  • Familiarity with unit conversions (N to kg·m/s²)
  • Ability to perform vector addition of forces
NEXT STEPS
  • Study the concept of net force and its calculation in various scenarios
  • Learn about the effects of air resistance on projectile motion
  • Explore advanced applications of Newton's laws in rocket propulsion
  • Investigate the relationship between mass, acceleration, and force in different contexts
USEFUL FOR

Students studying physics, particularly those focusing on mechanics and dynamics, as well as educators teaching concepts related to forces and motion in rockets.

icecubefosho
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Homework Statement


An 8.0Kg rocket is fired and encounters a force of air resistance of 4.9N. If the rocket's engines applied 100N of thrust:
A. What is the Net Force on the rocket?
B. What is the Rocket's Acceleration?

Homework Equations


(A) F=MA
(B) Is it (Vfinal - Vinitial)/T?

The Attempt at a Solution


(A)F=MA
F=(8.0KG)(A) = (8.0 x A) The paper tells me its 16.7N
(B) I don't know if this is the right equation... but it must be about 2.9 M/S2 to get A above.
 
Physics news on Phys.org
a) The rocket is fired vertically... just added up all the forces in the vertical direction... remember to take signs into account... you have 3 forces... thrust, gravity and air resistance.

b) here use fnet = ma where fnet is what you get in part a).
 

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