DYNTCS 12. A little red wagon with mass 7 kg moves in
straight line on a frictionless horizontal
Forced=ON
surface. It has an initial speed of 4 m/s and
Final speed
Acceleration
We have. Poma
then is pushed 3 m in the direction of the
F 10
Initial velocity by a force of 10 N. Calculate
= 1 43 m/sec
the wagon's final speed and the acceleration Again, as - 31433
produced by the forces
or v = 24 58
= 496 m/sec
Solution:
Final speed (v) = 496 m/sec
Given Mass of wagon (m) = 7 kg
acceleration = 1.43 m/sec
Initial speed (u) = 4 m/sec
Self-Test Problems
A car of mass of 1000 kg is accelerating at 2 ms. What resultant force acts on the ear? If the
resistance to the motion is 1000 N, what is the force due to engine?
Ans: 2000 N. 3000 N
A box of mass 50 kg is pulled up from the hold of a ship with an acceleration of 1 ms by a vertical
rupe attached to it. Find the tension in the rope. What is the tension in the rope when the box move
up with a uniform velocity of 1 m 8-19
Ans: 550 N. 500
A lift moves (i) up and (ii) down with an acceleration of 2 ms. In each case, calculate the reaction
the floor on a man of mass 50 kg standing in the lift
Ans: (i) 600 N (u) 400
A ball of mass 0.2 kg falls from a height of 45 m. On striking the ground, it rebounds in 0.1 s with to

Red’s momentum vector before the collision is green’s momentum vector after the collision. question 1 options: equal to shorter than longer than question 2 (1 point) saved since green bounces off red, this must be an collision. question 2 options: explosion elastic inelastic question 3 (1 point) red transfers of its momentum to green during the collision. question 3 options: none all little most question 4 (4 points) why does red transfer all its momentum to green? back up your answer with information from the simulation. write at least 2 sentences. question 4 options: skip toolbars for . more insert actions. more text actions. more paragraph style actions. question 5 (1 point) now make red much heavier than green. answer the questions below to describe how both red and green behave after the collision. question 5 options: slowed down sped up kept the same velocity question 6 (1 point) green sped up during the collision as it question 6 options: gained momentum from red lost momentum to red maintained a constant momentum. question 7 (1 point) after the collision . . question 7 options: both green and red moved to the right. both green and red stopped as they have lost all momentum. red stopped and green moved to the right. red bounced off green and went to the left. green moved to the right. question 8 (4 points) only some of red’s momentum was transferred to green. why did this occur? back up your answer with information from the simulation. write at least 2 sentences. question 8 options: skip toolbars for . more insert actions. more text actions. more paragraph style actions. question 9 (1 point) now make red much lighter than green. answer the questions below to describe how both red and green behave after the collision question 9 options: green sped up after the collision therefore it must have gained momentum. green sped up after the collision therefore it must have lost momentum. green slowed down after the collision therefore it must have gained momentum. green slowed down after the collision therefore it must have lost momentum. question 10 (1 point) since green gained momentum, red had to have momentum because you cannot create or destroy momentum. question 10 options: gained lost kept the same amount of question 11 (1 point) since green was so much and harder to move, it caused red to bounce back to the left giving red . question 11 options: heavier . . . . positive lighter. . . . negative lighter. . . . positive heavier . . . . negative question 12 (4 points) now, click on more data at the bottom of the sim. play with different numbers for the masses and starting velocities. you can even make the starting velocities negative! tell me one thing you discovered by adjusting the speeds and masses. write at least 2 sentences. be specific and use words like velocity, momentum, mass, increased, decreased, etc. 13. true or false: when red and green collide, they stick together. question 13 options: true false question 14 (1 point) the velocity of red & green after the collision is the velocity that red started off with. question 14 options: larger than smaller than equal to question 15 (1 point) the velocity after the collision was less because the mass has question 15 options: stayed the same decreased increased question 16 (1 point) the momentum before the collision was the momentum after the collision. question 16 options: larger than smaller than equal to conclusions question 17 (4 points) how are elastic and inelastic collisions different? give two or more ways. your answer should have at least 2 sentences. question 18 (4 points) give an example of a collision in real life. use the law of conservation of energy to describe the transfer of momentum. be sure and discuss the momentum before and after the collision occurs. you will need at least 3 sentences to thoroughly answer this question.

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