Physics problems: conservation laws

Conservation of momentum


Problem 4.

A 2000 kg truck is traveling east through an intersection at 2 m/s when it is hit simultaneously from the side and the rear. One car is a 1000 kg compact traveling north at 5 m/s.  The other car is a 1500 kg midsize traveling east at 10 m/s.  The three vehicles become entangled and slide at one body.  What are their speeds and direction just after the collision?



Problem 7.

Ball A, with a mass of 2 kg, moves with a velocity 5 m/s. It collides with a stationary ball B, with a mass of 4 kg. After the collision, ball A moves in a direction 60.0 degrees to the left of its original direction, while ball B moves in a direction 50.0 degrees to the right of ball A's original direction. Calculate the velocities of each ball after the collision.



Problem 8.

A toy car “1” of mass 0.30 kg moves along a frictionless surface with a velocity of 0.20 m/s. It collides with another toy car “2”, with a mass of 0.40 kg and a speed of 0.10 m/s in the same direction. After the collision, toy car “1” continues to move in the same direction with a velocity of 0.15 m/s. Calculate the speed of toy car “2” after the collision.



Problem 9.

A skater of mass 80 kg initially at rest speeds up to a final speed of 10.0 m/s along a straight line and towards the East direction.

(a) Find the momentum of the skater while at rest.

(b) Find the momentum of the skater while traveling with its final speed.

(c) Find the change in momentum of the skater.

(d) Find the impulse acted on the skater.

(e) If that impulse exerted on the skater acts for 4 s, find the average force acting on the skater.



Problem 10.

A constant force of 80 N acts for 8 s on a box of mass 10 kg horizontally that initially rests on a horizontal frictionless surface.

(a) Find the change in the box's momentum.

(b) Calculate the final speed of the box after the 8 s have passed.



Problem 20.

Two bodies of mass M and 4M are moving with equal kinetic energy. What is the ratio of their linear momenta?







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