iGCSE Physics (0625) 1.3 Mass and weights-Exam Style Questions- New Syllabus
▶️ Answer/Explanation
Detailed solution:
Weight is defined as the gravitational force acting on an object that has mass.
This force is always directed towards the center of the Earth, which is represented as vertically downwards.
The horizontal motion of the arrow at constant speed does not change the direction of the gravitational pull.
In the provided diagram, arrow $A$ points directly toward the ground, representing the vertical downward pull of gravity.
Therefore, the weight of the arrow acts in direction $A$, regardless of its horizontal velocity or direction of motion.
▶️ Answer/Explanation
Detailed solution:
Weight is the gravitational force acting on an object and is calculated using the formula $W = m \times g$.
Given the mass $m = 6.0\text{ kg}$ and the gravitational field strength $g = 20\text{ N/kg}$.
Substituting the values: $W = 6.0\text{ kg} \times 20\text{ N/kg}$.
This gives a total weight of $120\text{ N}$.
Therefore, the object exerts a downward force of $120\text{ N}$ on the planet’s surface.
Option D is the correct numerical result of this calculation.
▶️ Answer/Explanation
Detailed solution:
According to the syllabus, forces can cause an object to change its shape or size, such as stretching a spring. Additionally, a resultant force $F$ causes an object of mass $m$ to undergo acceleration $a$, governed by $F = ma$, which changes its speed. However, mass is defined as the quantity of matter in an object; applying a force does not add or remove matter. Therefore, while velocity, size, and shape are all variable under the influence of a force, the mass remains constant.