The nice thing is that it doesn't change during a sliding motion. It's always pulling down with a magnitude equal to the product of the mass of the human (m) and the gravitational field (g = 9.8 ...

- OCR 21st Century Vector diagrams Unbalanced forces on an object will change its motion. Ideas about force and momentum can be used to explain road safety measures.

Scientists often make measurements. The physical quantities they measure fall into two categories: scalars and vectors. Scalar and vector quantities are treated differently in calculations. Motion ...

Since the velocity is a vector, you can have an acceleration just by changing the direction of the velocity. Moving in a circle at a constant speed means there is indeed an acceleration.