Question

question 10 (9 points)
match the description to newtons 1st, 2nd, or 3rd law of motion.
column a

1. as the fuel in a rocket ignites, the force of the gas expansion and explosion pushes out the back of the rocket and pushes the rocket forward.
2. when you are standing up in a subway train, and the train suddenly stops, your body continues to go forward.
3. after you start up your motorbike, as you give it more gas, it goes faster.
4. a pitched baseball goes faster than one that is gently thrown.
5. a swimmer pushes water back with her arms, but her body moves forward.
6. as an ice skater pushes harder with his leg muscles, he begins to move faster.
7. when bobby, age 5, and his dad are skipping pebbles on the pond, the pebbles that bobbys dad throws go farther and faster than his.
8. when you paddle a canoe, the canoe goes forward.
9. a little girl who has been pulling a sled behind her in the snow is crying because when she stopped to tie her hat on, the sled kept moving and hit her in the back of her legs.

column b
a. 3rd
b. 1st
c. 2nd

Explanation:

1. Gas - rocket interaction is action - reaction, Newton's 3rd law.
2. Body continuing forward when train stops is due to inertia, Newton's 1st law.
3. More gas makes motorbike go faster, force - acceleration relation, Newton's 2nd law.
4. Faster pitched baseball, more force leads to more acceleration, Newton's 2nd law.
5. Swimmer pushing water and moving forward is action - reaction, Newton's 3rd law.
6. Ice skater pushing harder and moving faster, force - acceleration relation, Newton's 2nd law.
7. Dad's pebbles going faster, more force leads to more acceleration, Newton's 2nd law.
8. Paddling canoe and it moving forward is action - reaction, Newton's 3rd law.
9. Sled keeping moving when girl stops is due to inertia, Newton's 1st law.

Answer:

1. a. 3rd
2. b. 1st
3. c. 2nd
4. c. 2nd
5. a. 3rd
6. c. 2nd
7. c. 2nd
8. a. 3rd
9. b. 1st