thomas 2nd law test

Question 1

Bossy newtons first law

Answer 1

if a body is at rest or moving at a constant speed in a straight line, it will remain at rest or keep moving in a straight line at constant speed unless it is acted upon by a force.

Question 2

Bossy newtons second law

Answer 2

the time rate of change of the momentum of a body is equal in both magnitude and direction to the force imposed on it. The momentum of a body is equal to the product of its mass and its velocity.

Question 3

Bossy newtons third law

Answer 3

when two bodies interact, they apply forces to one another that are equal in magnitude and opposite in direction.

Question 4

Towing problem

Answer 4

Net force: (one force take away the other)

Acceleration: F=MA

Question 5

Rocket problem

Answer 5

Thrust, T, from the rocket increases
Weight of the rocket, MG, decreases
F=T-MG

Question 6

Elevator problem Lift moving up and accelerating

Answer 6

F=MG
T-MG=MA
1) Lift moving up and accelerating (a>0) T=MG+MA T>MG

Question 7

Pulling problem

Answer 7

As on goes up, one goes down
For m: T-mG=mA
For M: Mg-t=MA
T-MG = MG -T (M-m)g = (M+m)a

Question 8

Sliding slope

Answer 8

mgsinθ = force slope down
mgsinθ - friction = ma
mgsinθ - friction = resultant force

Question 9

Lift problem Lift moving at combined velocity

Answer 9

F=MG
T-MG=MA
2) Lift moving at combined velocity (a=0) T=MG

Question 10

lift problem Lift, M, moving up and decelerating

Answer 10

F=MG
T-MG=MA
3) Lift, M, moving up and decelerating (a<0) T=MG+MA T(less than) MG

Question 11

Lift problem Lift accelerating downwards

Answer 11

F=MG
T-MG=MA
4) Lift accelerating downwards (a<0) T=MG+MA T

Question 12

Lift problem Lift moving down and decelerating

Answer 12

F=MG
T-MG=MA
5) Lift moving down and decelerating (a>0) T=MG+M