1. The categories in which forces can be classified into are; contact forces and action-at-a-distance forces. An example of a contact force is friction. An example of an action-at-a-distance force is gravity.
2. Weight is different from mass because mass is the amount of matter in an object, whereas weight is the amount of force on an object, due to the force of gravity.
3. The most commonly used device for measuring force is a spring scale, (a.k.a. the Newton gauge).
Answer Key
1. The categories in which forces can be classified into are; contact forces and action-at-a-distance forces. An example of a contact force is friction. An example of an action-at-a-distance force is gravity.
2. Weight is different from mass because mass is the amount of matter in an object, whereas weight is the amount of force on an object, due to the force of gravity.
3. The most commonly used device for measuring force is a spring scale, (a.k.a. the Newton gauge).
4. a) 25 kg
Fg = mg
Fg = (25 kg) (9.8 N/kg)
Fg = 245 N
b) 6 kg
Fg = mg
Fg = (6 kg) (9.8 N/kg)
Fg = 58.8 N
c) 250 g
Fg = mg
Fg = (250 g) (9.8 N/kg)
Fg = (0.25 kg) (9.8 N/kg)
Fg = 2.45 N
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