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The units in which we talk about cars often differ from the SI units
we conventionally use in Physics. This table gives some examples.
The last column gives the typical range of values for a normal
- Velocity has the same magnitude as speed, but is associated with
a direction. A car moving in a circle may have a constant speed, but it
has a changing velocity.
- Mass is often referred to as weight. Weight is the force exerted
by a mass due to the earth's gravitational pull.
- Power (and Torque) are usually quoted as the maximum values. The engine
produces less power (torque) if the accelerator pedal is not pressed fully
to the floor, or if it is not spinning at the optimal speed (see Part II).
- In SI units, torque is quoted in Nm, but this must not be confused
with Joules. They mean completely different things (see below).
Thursday October 8 16:09:30 BST 1998