Physics Applications: Momentum, Impulse, and Recoil Calculations
Momentum-Impulse
Physics 513
Multi-Dimensional Impulse
•
A soccer ball has a mass of 0.40 kg. Initially it
is moving to the left at 20 m/s, but then it is
kicked. After the kick it is moving at 45°
upward and to the right with speed 30 m/s.
Find the impulse of the net force and the
average net force, assuming a collision time
Δ
t
= 0.010 s
Conservation of Momentum
Physics 513
On Your Mark…
•
A marksman holds a rifle of mass
m
R
= 3.00 kg
loosely, so it can recoil freely. He fires a bullet
of mass
m
B
= 5.00 g horizontally with a
velocity relative to the ground of
v
B
= 300 m/s.
What is the recoil velocity
v
R
of the rifle?
Bang!
•
A ballistic pendulum comprises a simple
system for measuring the speed of a bullet. A
bullet of mass
m
B
makes a completely inelastic
collision with a block of wood of mass
m
W
,
which is suspended like a pendulum. After the
impact, the block swings up to a maximum
height
y
. In terms of
y
,
m
B
, and
m
W
, what is
the initial speed
v
o
of the bullet?
Explore various physics scenarios involving momentum, impulse, and recoil in this collection. Calculate the impulse of net force, average net force, recoil velocity of a rifle, and initial speed of a bullet using principles of conservation of momentum. Solve problems related to multi-dimensional impulses and ballistic pendulum measurements. Enhance your understanding of how forces interact to produce motion in different scenarios.
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Presentation Transcript
Momentum-Impulse Physics 513
Multi-Dimensional Impulse A soccer ball has a mass of 0.40 kg. Initially it is moving to the left at 20 m/s, but then it is kicked. After the kick it is moving at 45 upward and to the right with speed 30 m/s. Find the impulse of the net force and the average net force, assuming a collision time t = 0.010 s
Conservation of Momentum Physics 513
On Your Mark A marksman holds a rifle of mass mR= 3.00 kg loosely, so it can recoil freely. He fires a bullet of mass mB= 5.00 g horizontally with a velocity relative to the ground of vB= 300 m/s. What is the recoil velocity vRof the rifle?
Bang! A ballistic pendulum comprises a simple system for measuring the speed of a bullet. A bullet of mass mBmakes a completely inelastic collision with a block of wood of mass mW, which is suspended like a pendulum. After the impact, the block swings up to a maximum height y. In terms of y, mB, and mW, what is the initial speed voof the bullet?
