The percentage and force of Friction ( 9/28/09)

Click For Summary
SUMMARY

The discussion focuses on a physics problem involving a 10g bullet fired into a ballistic pendulum consisting of a 4kg wooden block. The initial velocity of the bullet was calculated to be 19.8 m/s using the equation 1/2mv² = mgh. The participant also calculated the force of friction acting on the bullet within the block to be 1.5E-3 N, employing the formula F = ma. The percentage of the bullet's initial kinetic energy lost during the collision remains to be determined.

PREREQUISITES
  • Understanding of kinetic energy and gravitational potential energy
  • Familiarity with Newton's laws of motion
  • Knowledge of ballistic pendulum mechanics
  • Ability to perform basic physics calculations involving mass, velocity, and force
NEXT STEPS
  • Calculate the percentage of kinetic energy lost during the collision using energy conservation principles
  • Explore the concept of ballistic pendulums and their applications in physics
  • Study the effects of friction on motion and energy loss in collisions
  • Review the derivation and application of the equations of motion in collision scenarios
USEFUL FOR

Students studying physics, particularly those focusing on mechanics and energy conservation, as well as educators seeking to enhance their understanding of collision dynamics.

sumo87
Messages
2
Reaction score
0

Homework Statement



Hi everyone,

I have 2 quick Questions, about my HW so if u think u can give me a hit please post.

Homework Equations



the Question was :-

10g bullet is fired into a ballistic pendulum made from a 4kg wood block and two light cords. The block's vertical displeacment is 5 cm.

1-

what is the inital velocity.

what percentage of the bullet's initial kinetic energy is lost in the collision

what is the force of friction acting on the bullet in the block assuming that it stops in 3 cm

The Attempt at a Solution

I found the initial velocity into the equation

1/2mv^2 = mgh

and i got 19.8 m/s

so please help me with 2nd and the 3rd Qs
 
Physics news on Phys.org
k i got for the 3ed Q

1.5E-3

I used the equation

F= ma
 

Similar threads

Find the mass of a block on an inclined pulley
  • · Replies 3 ·
Replies
3
Views
2K
The tension in the cord in this system
  • · Replies 7 ·
Replies
7
Views
2K
How Does Friction Affect Pulley Systems on Inclined Planes?
  • · Replies 6 ·
Replies
6
Views
3K
Conservation of Energy With Friction
  • · Replies 10 ·
Replies
10
Views
3K
Linear momentum problem (ballistic pendulum)
  • · Replies 2 ·
Replies
2
Views
4K
How to use the coefficient of kinetic friction?
  • · Replies 36 ·
2
Replies
36
Views
4K
Friction on an incline and velocity
  • · Replies 3 ·
Replies
3
Views
2K
Calculating Force Magnitude with Friction and Initial Velocity
  • · Replies 18 ·
Replies
18
Views
2K
How Far Will a Block Slide on an Incline with Friction?
  • · Replies 2 ·
Replies
2
Views
2K
Does V0 affect acceleration under constant Force?
  • · Replies 4 ·
Replies
4
Views
2K