Physics Help: Calculating Breaking Distance with -9000 N Force

  • Thread starter Thread starter emma123
  • Start date Start date
  • Tags Tags
    Force
AI Thread Summary
To calculate the breaking distance for a 1500 kg car stopped by a -9000 N force, first apply Newton's second law to find the acceleration. With the given force and mass, the acceleration can be calculated as -6 m/s². Next, use the initial velocity of 30 m/s and the calculated acceleration in a kinematic equation to determine the breaking distance. The relevant kinematic formula relates initial velocity, acceleration, and distance. This approach will yield the required breaking distance to bring the car to a halt.
emma123
Messages
29
Reaction score
0
hi this is my first year in physics and i am already confused on it. I really need help on the following question: "The force of -9000 N is used to stop a 1500 kg car traveling at 30 m/s. What is the breaking distance is needed to bring the car to a halt?" I have no idea which formula to use or where to begin since i don't have the time or acceleration. Please help me. Thanks!
 
Physics news on Phys.org
You have a force and a mass, you can find teh acceleration using Newton's 2nd law.
 
you already have "v", once you find "a" you can use one of those kinematic equations to find "d".
 
Thanks A Bunch!
 
Thread 'Variable mass system : water sprayed into a moving container'
Starting with the mass considerations #m(t)# is mass of water #M_{c}# mass of container and #M(t)# mass of total system $$M(t) = M_{C} + m(t)$$ $$\Rightarrow \frac{dM(t)}{dt} = \frac{dm(t)}{dt}$$ $$P_i = Mv + u \, dm$$ $$P_f = (M + dm)(v + dv)$$ $$\Delta P = M \, dv + (v - u) \, dm$$ $$F = \frac{dP}{dt} = M \frac{dv}{dt} + (v - u) \frac{dm}{dt}$$ $$F = u \frac{dm}{dt} = \rho A u^2$$ from conservation of momentum , the cannon recoils with the same force which it applies. $$\quad \frac{dm}{dt}...
TL;DR Summary: I came across this question from a Sri Lankan A-level textbook. Question - An ice cube with a length of 10 cm is immersed in water at 0 °C. An observer observes the ice cube from the water, and it seems to be 7.75 cm long. If the refractive index of water is 4/3, find the height of the ice cube immersed in the water. I could not understand how the apparent height of the ice cube in the water depends on the height of the ice cube immersed in the water. Does anyone have an...
Back
Top