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Which direction must the string run for the sundial to work properly? Which direction must the string run for the sundial to work properly?
In such a direction that it is not 'standing into danger'.
Yes, vectors must have the direction. Without direction, it is simply a scalar quantity.
a magnitude and direction
Speed and direction of motion are needed to determine velocity.
direction
Forces cause motion or the change in motion.
Yes, always. Velocity is a vector, meaning it has both a magnitude and a direction. You must account for the direction. Speed is the magnitude of velocity and has no direction.
The first number tells you how far you must go in one direction (by convention, often the horizontal direction); the second number tells you how far you must go in another direction (usually the vertical direction).
the child must apply a force on the direction perpendicular to the car from the right side
Yes, vectors must have the direction. Without direction, it is simply a scalar quantity.
unitary