FILL IN THE BLANKS
1 The force of gravity is a ____ force.
2 The force required to lift 1g mass vertically upward is _______
3 The force of friction acts in the ____ direction to the direction of applied force.
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Answer:
1 non contact force
2 2 g
3 opposite
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1. Non-contact force
2. Gravitational force
3. Frictional force
Explanation:
- The most familiar non-contact force is gravity. The force of attraction that exists among all bodies that have mass.
- One Newton approximately equals the force to lift vertically upwards a 100 g mass against the gravitational acceleration. Another commonly used unit of force is kgf, which is the force required to lift vertically upward a mass of 1 kg.
- Frictional force offers the resistance to the applied force opposing its motion. Thus, it always acts in the direction opposite to that of the object in motion.
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