Year 2 Mechanics

Question 1

What is the equation for the moment of a force

Answer 1

Force x perpendicular distance

Question 2

What is the resultant moment

Answer 2

It is the sum of the moments acting on a body

Question 3

What does it mean if a rigid body is in equilibrium

Answer 3

The resultant force is 0
The resultant moment is 0

Question 4

What does it mean if a rigid body is on the point of tilting about a pivot

Answer 4

The reaction at any other support is zero

Question 5

What is the equation for friction

Answer 5

F = uR
u=coefficient of friction
R = normal reaction force between 2 surfaces

Question 6

What is the horizontal motion of a projectile measured as

Answer 6

It has a constant velocity
acceleration is zero

Question 7

What is the vertical motion of a projectile measured as

Answer 7

It has a constant acceleration of g

Question 8

What is the time of flight of a particle

Answer 8

2Usinx / g
U = initial velocity

Question 9

What is the time to reach greatest height

Answer 9

Usinx/g
U = initial velocity

Question 10

What is the range on horizontal plane

Answer 10

U2sin2x / g

Question 11

What is the equation of trajectory

Answer 11

y=xtanz -gx^2(1+tan^2z)/2U^2
y is vertical height
x is horizontal distance