O level Force, Mass and Weight
Use the following learning outcomes to design a lesson to learn O level science physics topic on kinematics.
Learning Outcomes
Candidates should be able to:
(a) identify and distinguish between contact forces (e.g. friction, air resistance, tension and normal force)
and non-contact forces (e.g. gravitational, electrostatic and magnetic forces)
(b) state that mass is a measure of the amount of matter in a body
(c) state that a gravitational field is a region in which a mass experiences a force due to gravitational attraction
(d) define gravitational field strength, g, as gravitational force per unit mass placed at that point
(e) recall and apply the relationship weight = mass × gravitational field strength to new situations or to solve related problems
(f) distinguish between mass and weight
(g) recall and apply the relationship density = mass / volume to new situations or to solve related problems
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答案文本
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Forces can be classified into two main types. Contact forces require physical contact between objects, such as friction when surfaces rub together, air resistance opposing motion through air, tension in ropes or strings, and normal force from surfaces pushing back. Non-contact forces act at a distance without physical contact, including gravitational force between masses, electrostatic force between charges, and magnetic force between magnets.