the unit is centimetre square or metre square - Area, the unit centimetre or metre - length, a push or a pull - force, the unit Kg or gram - mass, a force of gravity and can be zero - weight, is contact force between to surfaces - friction, Upthrust, a pulling force by any object i.e the planet - Gravity, non contact force, a force by air particles effects the speed of the object - Air resistance, is useful because it help the car moving forward - friction between the tires and the road, not useful because can limit the speed of the car - friction between the air and the car's body, the bigger the force - The longer the arrow, is the device to measure force. there is a spring inside - force meter, it will stretches 9 cm when 15 N weight hangs on it - A spring stretches 3 cm when a 5 N weight hangs on it., it will stretches 15 cm when 9 N weight hangs on it - A spring stretches 5 cm when a 3 N weight hangs on it.,

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