Mechanics

Question 1

What are the 4 suvat equations?

Answer 1

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

Question 2

What are newton’s 3 laws?

Answer 2

1st - an object will remain stationary or moving at a constant speed until a resultant force acts (inertia)
2nd - F=ma
3rd - if object A exerts a force on object B, object B will exert an equal and opposite force on object A

Question 3

What is drag dependent on?

Answer 3

The viscosity if the fluid
Speed
Objects surface area

Question 4

How do we reduce the force of impact?

Answer 4

Increase the time for the impact. Crumple zones increase the time it takes for the car to come to a stop, increasing the impact time, and decreasing the force on the passengers

Question 5

Difference between elastic and inelastic collisions?

Answer 5

In elastic collisions kinetic energy is conserved, in inelastic collisions kinetic energy is not conserved

Question 6

What affects stability?

Answer 6

The base area
The mass

Question 7

What is a couple?

Answer 7

A pair of forces of equal size which act parallel to each other in opposite directions

Question 8

What is the moment of a couple?

Answer 8

One force × perpendicular distance between the two forces