What
is the momentum of an 6 Kg bowling ball rolling at 3 m/s? Solution
Calculate the momentum
of an 80 Kg ice skater sliding along the ice at 4 m/s. Solution
An
explosive charge is placed between the two balls shown on the right. When
the charge is detonated both balls move in opposite directions with different
velocities?
If the orange ball has a velocity
of 10 m/s after the explosion, can you calculate the velocity of the blue
ball? Solution
If the orange ball
has a velocity of 20 m/s after the explosion, can you calculate the velocity
of the blue ball?
Consider the animation
on the right. An explosive charge accelerates a 30 Kg cannon ball from the
cannon at a speed of 600 m/s. What is speed with which the 1,00o kg cannon
recoils?
A 10 Kg rifle is
used to fire a 30 g bullet at a target. If the bullet leaves the rifle with
a speed of 700 m/s what is the speed with which the rifle recoils?
The guns on Nelson's
Victory are shown on the right. 30 Kg cannon balls were often fired at speeds
in excess of 600 m/s. These guns recoiled violently when fired. Were they
too heavy or too light? Explain.
Consider the picture
on the right of a V2 rocket been launched. The rocket weighing several tons
is accelerating quickly. Is this an example of conservation of momentum?
Explain.
Tanks fire heavy
shells a distance of many kilometres. Why is there little recoil from the
immense force required to propel the shells?
An 70 Kg man on
frictionless roller skates throws a 5 kg ball at 2 m/s at his friend. What
is the speed with which the man moves backwards?
Consider the video on the right. It shows two trolleys colliding.
If each trolley weighs 2.0 Kg what is the speed of the initial trolley before the collision if the speed of the second trolley, after the collision, is 2.0 m/s?
What is the momentum of the first trolley, approaching from the right, after the collision?
What is the momentum of the system immediately after the collision?
Consider the video on the right. It shows two trolleys being pushed apart as a spring is released. Both trolleys travel in opposite direction to each other.
What is the momentum of the system just before the spring is released?
What is the momentum of the system immediately after the spring is released?
Explain.
If both trolleys are of equal mass, what can you say about the speed of each trolley?
