Two railway trucks are travelling in the same direction and collide. The mass of truck X is 2 . 0 × 10 4 kg and the mass of truck Y is 3 . 0 × 10 4 kg . This graph shows how the velocity of each truck varies with time. (b) State and explain whether the collision of the two trucks is an example of an elastic collision.

Initial kinetic energy before 2.0 second = 2 × 10 4 × 5 2 + 3 × 10 4 × 1 2 2 J =total initial kinetic energy= 2 . 65 × 10 5 J Final kinetic energy after 3.6 second = 3 × 10 4 × 3 2 + 2 × 10 4 × 2 2 2 J Total final kinetic energy= 1 . 75 × 10 5 J Collision is not elastic because the total kinetic energy has decreased in the collision

Two railway trucks are travelling in the same direction and collide. The mass of truck X is 2 . 0 × 10 4 kg and the mass of truck Y is 3 . 0 × 10 4 kg . This graph shows how the velocity of each truck varies with time. (b) State and explain whether the collision of the two trucks is an example of an elastic collision.

Initial kinetic energy before 2.0 second = 2 × 10 4 × 5 2 + 3 × 10 4 × 1 2 2 J =total initial kinetic energy= 2 . 65 × 10 5 J Final kinetic energy after 3.6 second = 3 × 10 4 × 3 2 + 2 × 10 4 × 2 2 2 J Total final kinetic energy= 1 . 75 × 10 5 J Collision is not elastic because the total kinetic energy has decreased in the collision

Two railway trucks are travelling in the same direction and collide. The mass of truck X is 2 . 0 × 10 4 kg and the mass of truck Y is 3 . 0 × 10 4 kg . This graph shows how the velocity of each truck varies with time. Determine the force that acts on each truck during the collision.

Change in momentum kg m s - 1 Initial kinetic energy J Final kinetic energy J truck X 6 . 0 × 10 4 2 . 5 × 10 5 4 . 0 × 10 4 truck Y 6 . 0 × 10 4 1 . 5 × 10 4 1 . 35 × 10 5 Using the relation between force and momentum , we have f o r c e = c h a n g e i n m o m e n t u m t i m e = 6 × 10 4 1 . 6 = 3 . 75 × 10 4 N

E M B I B E

Physics for Cambridge International AS & A Level Coursebook 3rd Edition Digital Access>Chapter 6 - Momentum>EXAM-STYLE QUESTIONS>Q 14

EASY

AS and A Level

IMPORTANT

Earn 100

Two railway trucks are travelling in the same direction and collide. The mass of truck $X$ is $2.0 \times 10^{4} kg$ and the mass of truck $Y$ is $3.0 \times 10^{4} kg$ . This graph shows how the velocity of each truck varies with time.

(b) State and explain whether the collision of the two trucks is an example of an elastic collision.

Important Questions on Momentum

EASY

AS and A Level

IMPORTANT

Physics for Cambridge International AS & A Level Coursebook 3rd Edition Digital Access>Chapter 6 - Momentum>EXAM-STYLE QUESTIONS>Q 14

Two railway trucks are travelling in the same direction and collide. The mass of truck $X$ is $2.0 \times 10^{4} kg$ and the mass of truck $Y$ is $3.0 \times 10^{4} kg$ . This graph shows how the velocity of each truck varies with time.