Question 7
While a cart pulled by a bullock is moving, someone applies a force opposite to the direction the cart is travelling. What happens to the cart?
The right answer is the one marked above.
Its velocity decreases. The force applied opposes the direction of travel, so it works against the motion and reduces the velocity.
The very same force applied along the direction of motion would increase the velocity instead. So the magnitude can be identical, yet the result is completely different depending on direction.
Which means a magnitude alone is not enough to describe a force — a direction is needed too. That is exactly what makes force a vector quantity.