Grip
The amount of traction a car can transfer on track trough contact between tires and road, and traction car has at any given point, thus affecting how easy it is for the driver to keep control through corners. Grip depends of track condition, temperature of track or tires, and tire compound used as whell as car global set-up.
It's well known that F1 drivers used to say that during Friday free practice, track condition (or grip) is not good, or that later during session track condition will "come to them". That mean that track condition (read grip) will improve as more rubber is laid on the track and dust, send and dirt is cleaned from tack by passing cars.
Same is valid when they say that they can't get rubbers work properly, they can't get proper temperature to the tires and so on. All that mean - "I don't have enough grip"
Grip also depend, as I sad before, how good is your global car setup, aerodynamical efficiency of your car, aerodynamical grip, mechanical balance, brake balance, car downforce, dynamic weight distribution, ride height, suspension setup and a combination of all that.
A lot to think about for a race engineer and driver.
