Mechanics

Question 1

What is the formula for Force?

Answer 1

Force = mass × acceleration

Question 2

What is the formula for Momentum?

Answer 2

Momentum = mass × velocity

Question 3

What is the First Law of Motion?

Answer 3

An object at rest will remain at rest and an object in motion will stay at a constant velocity unless an unbalanced external force acts upon it.

Question 4

What is the Second Law of Motion?

Answer 4

The rate of change of an object’s momentum is directly proportional to the force which caused it.

Question 5

What is the Third Law of Motion?

Answer 5

When objects interact, they exert an equal and opposite force on each other.

Question 6

What is the Law of Conservation of Momentum?

Answer 6

In any interaction between two or more bodies, the total momentum before and after the collision will be equal, provided no external factors act upon the system.

Question 7

What is the Conservation of Momentum formula?

Answer 7

m1u1 + m2u2 = m1v1 + m2v2

Question 8

Prove V=u+at

Answer 8

a=(v-u)/t > at=v-u > v=u+at

Question 9

Prove s=ut+1/2at^2

Answer 9

s=(u+v)/2 x t > s=(u+u+at)t/2 > s=(2ut+at^2)/2 > s=ut+1/2at^2

Question 10

Prove v^2=u^2+2as

Answer 10

v=u+at > v^2=u^2+2uat+(at)^2 > v^2=u^2+2a(ut+1/2at^2) > v^2=u^2+2as

Question 11

How does force relate to momentum

Answer 11

F=mv-mu / t