MECHANICS

Question 1

Projectile motion

Answer 1

2 suvat
vertical and horizontal motions
no air resistance horizontally (speed distance time equation can be used).

Question 2

W = fscosx

Answer 2

F = force same direction of distance
s = distance
x = angle between f and s
W = work done

Question 3

Area under force displacement graph

Answer 3

work done

Question 4

Area under force time graph

Answer 4

Impulse

Question 5

Couple

Answer 5

pair of equal and opposite coplanar forces

Question 6

Coplanar Forces

Answer 6

multiple forces acting on an object in the same plane

Question 7

Moment

Answer 7

Force about a point x perpendicular distance between the pivot and the line of action of the force

Question 8

Moment of couple

Answer 8

force x perpendicular distance between lines of action of forces

Question 9

Conditions for equilibrium

Answer 9

All forces acting on body = 0

Question 10

change in momentum

Answer 10

impulse

Question 11

equation for momentum carried per second

Answer 11

F = (impulse/ t) x v

Question 12

momentum carried per second equation (in density)

Answer 12

F = pAv^2

Question 13

why displacing gas from a parachute cause a force on system and deceleration.

Answer 13

Gas is being accelerated this requires a force according to Newtons 2nd law. Gas exerts force with equal magnitude and opposite direction force. Drag on system. Parachute exerts force on gas due to Newtons 3rd law. Resistive force greater than weight, therefore resultant force, acceleration in same direction as resultant force according to Newtons 2nd law.

Question 14

How does an increase in density (from dust) of atmosphere decelerate a system.

Answer 14

more gas/ dust to displace, greater resistive force, greater rate of change of momentum, greater resultant force on system greater loss of velocity per second

Question 15

scalars

Answer 15

mass, speed, distance, temperature

Question 16

Vectors

Answer 16

Weight
force
displacement
velocity
acceleration