Provided that no external forces are acting, it can be assumed that when collision happens between two bodies, the total momentum before collision is the same as that after collision.
A 2.0 kg object moving with a velocity of 8.0 ms -1 collides with a 4.0 kg object moving with a velocity of 5.0 ms -1 along the same line. If the two objects join together on impact, calculate their common velocity when they are initially moving
Momentum is conserved in a collision. Total energy is also conserved but the kinetic energy might not be conserved. It can be converted to other forms such as sound, work done during plastic deformation, etc.
Calculate the KE converted to other forms during the collisions in (a) and (b) of Exercise 2.2
KE converted = [ 6J ]
KE converted = [ 113J ]
Exercise 2.4:
A 2.0 kg object moving with velocity 6.0 ms -1 collides with a stationary object of mass 1.0 kg. Assuming that the collision is perfectly elastic, calculate the velocity of each object after the collision.
Two particles S of mass 30g and T of mass 40g, both travel at the speed of 35 ms -1 in directions at right angles to each other. The two particles collide and stick together. Calculate their speed after the impact. [ 25.0 ms -1 ]
An object explodes as a result of some internal forces. As the result, the total momentum of the separate parts will be the same as that of the original body, which is normally zero.
Exercise 2.4:
Figure below shows two trolleys A and B initially at rest, separated by a compressed spring. The spring is now released and the 3.0 kg trolley moves with a velocity of 1.0 ms -1 to the right. Calculate:
Figure below shows how the force acting on a body varies with time. The increase in momentum of the body, measured in Ns as the result of this force acting for four seconds is _________
A 1500kg car traveling east with the speed of 25 ms -1 collides at an intersection with a 2500kg van traveling north at a speed of 20ms -1 . find the direction and the magnitude of the velocity of the wreckage after the collision, assuming that the collision undergoes perfectly inelastic collision
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