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Maths Edexcel A Level > AS Mechanics > Flashcards

Flashcards in AS Mechanics Deck (24)
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1

gravity

force of attraction between all objects

2

inextensible string

a string that does not stretch under load- acceleration is the same in objects connected by a inextensible string

3

light object

mass of the object is small compared to other masses, like a string or pulley (treat objects as having zero mass)

4

smooth surface

assume there is no friction between the surface and any object on it

5

weight

gravitational force that acts vertically downwards

6

friction

a force that opposes the motion between two rough surface

7

normal reaction

the force which acts perpendicular to a surface when an object is in contact with the surface

8

tension

the force acting on an object when it is being pulled along by a string

9

air resistance

opposes motion

10

buoyancy

the upward force on a body that allows it to float or rise

11

vector

a quantity with both magnitude and direction (positive or negative)

12

scalar

a quantity with magnitude only (only positive)

13

velocity

rate of change of displacement

14

Displacement-time graphs

Gradient represents the velocity
Average velocity= displacement from starting point/ time taken
Average speed= total distance travelled/ time taken

15

acceleration

rate of change of velocity

16

Velocity-time graphs

Gradient represents the acceleration
Area under graph represents the distance travelled

17

SUVAT Equations

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

18

Force of gravity

It causes all objects to accelerate towards the earth. If you ignore the effects of air resistance, the acceleration is constant. The acceleration does not depend on the mass of the object

19

Acceleration due to gravity

Modelled as g= 9.8 m/s^2

20

Newton's first law of motion

an object at rest and an object moving with constant velocity will continue in the same state unless acted upon by an unbalanced force

21

resultant force

causes the object to accelerate in the same direction as the resultant force

22

Newton's second law of motion

the force needed to accelerate a particle is equal to the product of the mass of the particle and the acceleration produced (F=ma)

23

Connected particles

When all parts of the system are moving in the same straight line, the whole system can be treated as a single particle

24

Newton's third law of motion

for every action there is an equal and opposite reaction