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Questions and Answers
A moving stone and a sack of cotton, both weighing 50 kg, will require the same force to stop them.
True
An object will always change its motion if a force is applied to it.
True
The first law of motion is also known as the law of force.
False
A basketball has greater inertia than a truck.
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Inertia is directly proportional to the mass of an object.
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Aristotle believed that an object in motion will eventually come to rest due to friction.
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An object in motion will always continue to move in a straight line if no net force acts on it.
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If the net force acting on an object is zero, the object will accelerate.
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Galileo's observations on horizontal motion are only applicable to horizontal motion.
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Inertia is the tendency of an object to resist changes in its velocity.
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Study Notes
Forces and Motion
- A greater force is required to stop a moving stone than a stationary sack of cotton, both weighing 50 kg, due to the stone's motion.
Inertia
- The presence of a force always results in changes to an object's motion.
- The first law of motion is also referred to as the law of inertia.
Comparing Inertia
- A truck has more inertia than a basketball due to its larger mass.
Inertia and Mass
- Inertia is inversely proportional to the mass of an object.
Force and Motion
- A balanced force is required to change the motion of an object.
- Inertia is the tendency of an object to resist changes in its motion, which is why a person riding a car would tend to move forward when the car stops suddenly.
- If the net force acting on a stationary object is zero, the object will not move.
- Aristotle believed that a moving object does not require force to keep moving, which is opposite to Newton's law.
- Newton built upon Galileo's observation on horizontal motion and extended it to include vertical motion, suggesting that these motions can be thought of as the same thing.
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Description
Test your understanding of inertia and its relationship with force, mass, and motion. Evaluate your knowledge of Newton's first law of motion and its applications.
