Chapter 4 - Mechanics

Question 1

Newton’s Laws:

1st =>

2nd =>

3rd =>

Answer 1

1st => No net force = no acceleration

2nd => Fnet = ma

3rd => F(1-on-2) = - F (2-on-1)

Question 2

What does it mean if Fnet = 0?

Answer 2

An object won’t accelerate, but it can still move

Question 3

If the masses of the interacting objects are not the same, according to Newton’s third law, but will also not be the same?

Answer 3

Resulting accelerations and velocities

Question 4

Normal force

Answer 4

Perpendicular to the surface that exerts it

Question 5

For an object on a horizontal surface, that feels no other vertical forces, the normal force =

Answer 5

Weight of the object

Question 6

Force due to gravity acting parallel on the inclined plane =

Answer 6

mgsin(theta)

Question 7

Force due to gravity acting perpendicular on the inclined plane =

Answer 7

mgcos(theta)

Question 8

Weight =

Answer 8

mg

Question 9

For kinetic friction, Ff =

Answer 9

coefficient of kinetic friction * Normal force

Question 10

For static friction, Ff, max =

Answer 10

coefficient of static friction * Normal force