Mechanics AS

Question 1

Pushing force

Answer 1

Thrust

Question 2

Pulling force

Answer 2

Tension

Question 3

Resistive force

Answer 3

Friction

Question 4

Rebound force

Answer 4

NCRF

Question 5

Gravity modelling assumption

Answer 5

Vertical and CONSTANT

Question 6

modelling assumption about surfaces

Answer 6

Smooth has NO FRICTION

Question 7

Modelling assumptions about particles

Answer 7

Has negligible dimensions

Question 8

Modelling assumptions about ‘light’ objects

Answer 8

0 mass

Question 9

SUVAT without s

Answer 9

a = v-u /t

Question 10

SUVAT without a

Answer 10

S = t (v+u)/2

Question 11

SUVAT without u

Answer 11

S = vt - 1/2 at^2

Question 12

SUVAT without v

Answer 12

S = ut + 1/2 at^2

Question 13

SUVAT without t

Answer 13

V^2 = u^2 + 2as

Question 14

displacement to velocity to acceleration

Answer 14

Differentiate

Question 15

Acceleration to velocity to displacement

Answer 15

Integrate

Question 16

r = (position vector)

Answer 16

r = r0 + s

s = displacement
r = original position

Question 17

SUVAT not used in 2D

Answer 17

v^2 = u^2 + 2as because squares aren’t vectors

Question 18

Modelling assumptions with projectiles

Answer 18

No air resistance,
Move freely under gravity,
No spin

Question 19

time of flight =

Answer 19

2u sinθ / g

Question 20

Horizontal displacement =

Answer 20

u^2 sin 2θ / g

Question 21

Time reached maximum height = (in terms of time)

Answer 21

Time of flight / 2

Question 22

Maximum height

Answer 22

u^2 sin^2 θ / 2g

Question 23

NI definition

Answer 23

an object at rest will stay at rest and an object moving at a constant VELOCITY will remain at a constant velocity unless a RESULTANT force acts upon it

Question 24

Rf =

Answer 24

F1 + F2 + F3 …

Question 25

NII definition (maths)

Answer 25

The RESULTANT force acting on a body is EQUAL to the PRODUCT of the mass of the body and its acceleration and force and acceleration are in the same direction.
F = ma

Question 26

NIII definition

Answer 26

The force exerted by body A on body B is equal in magnitude to the force exerted by body B on body A but in an opposite direction

Question 27

Find tension between two bodies connected by a string

Answer 27

Equal magnitude and opposite directions from each box
THEREFORE can model 2 particles as ONE PARTICLE

Question 28

equation for pulleys

Answer 28

NII and SUVAT

Question 29

Direction of tension in pulley system

Answer 29

Always TOWARDS pulley and OPPOSES WEIGHT