IB Physics HL-Topic 2

Define displacement

measured distance in a given direction

Define velocity

speed in a given direction

Define speed

rate at which moving object covers distance

Define acceleration

rate of change of velocity in a given direction

SUVAT equation not in Data Booklet

v=u+at

Acceleration of free fall

acceleration of a body falling in a vacumn near Earth's surface/ 9.8m/s^2

Constant Terminal Velocity

velocity increases until drag force equals acceleration of free fall then object no longer accelerates

Slope of distance time graph

speed

Slope of displacement time graph

velocity

Slope and area under of velocity time graph

acceleration/displacement

Slope and area under of acceleration time graph

impulse/velocity

Weight of a body using the expression

W=mg

State Newton's 1st Law of Motion

Every object continues in a state of rest/uniform motion in a straight line unless acted upon by an external force

State the condition for translational equilibrium

constant velocity (v=0/k) means acceleration=0/means net force on an object=0

State Newton's 2nd Law of Motion

force acting on an object is proportion to its acceleration F=ma/ F=deltap/deltat

Define linear momentum

p=mv

Define impulse

p=F/t

Area under Force Time graph

impulse

Law of Conservation of Linear Momentum

the momentum of a closed system is conserved p1m1=p2m2

State Newton's 3rd Law of Motion

When 2 bodies A & B interact the force that A exerts on B is equal and opposite to the force B exerts on A

What is meant by work?

W=Fd W=mgh *not always displacement

Area under Force Distance graph

=Work done

What is meant by a change in GPE?

stored energy changes to kinetic energy E=mgh

State principle of conservation of energy

Energy in a closed system is conserved (however entrophy)

Elastic collisions

mechanical energy not lost

Inelastic collisions

mechanical energy lost

Define Power

rate of work P=w/t P=Fv

Define concept of efficiency

Wout/Win or Pout/Pin

Acceleration of a particle moving with constant speed in a circle is directed towards the

center of the circle

Expression for centripetal acceleration

a=v^2/r *can use in F=ma to find centripetal force