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Questions and Answers
What is the S.I unit of force?
What is the S.I unit of force?
- Watt
- Joule
- Newton (correct)
- Pascal
Which type of force does work done depend on the path taken?
Which type of force does work done depend on the path taken?
- Spring force
- Gravitational force
- Frictional force (correct)
- Non-contact force
According to the 1st Law of Motion, what happens to an object at rest when no external force is applied?
According to the 1st Law of Motion, what happens to an object at rest when no external force is applied?
- It changes direction
- It accelerates
- It decelerates
- It moves at a constant velocity (correct)
Which law of motion quantifies motion?
Which law of motion quantifies motion?
In which case is acceleration zero?
In which case is acceleration zero?
What quantity is represented by the symbol 'F' in the equation F = ma?
What quantity is represented by the symbol 'F' in the equation F = ma?
In the context of the text, what is the significance of 'm' as a scalar quantity?
In the context of the text, what is the significance of 'm' as a scalar quantity?
Based on the content provided, what is the implication of the statement 'Gas expelled out'?
Based on the content provided, what is the implication of the statement 'Gas expelled out'?
What is the key principle that the range of weak nuclear force being of the order of 10m illustrates?
What is the key principle that the range of weak nuclear force being of the order of 10m illustrates?
How does the smoothness of surfaces affect friction according to the information provided?
How does the smoothness of surfaces affect friction according to the information provided?
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Study Notes
Motion and Force
- Motion is caused by force, which can bring a rested body to motion, bring a moving body to rest, speed up or slow down a body, and change the direction of a body.
- The S.I unit of force is Newton (N), which is a unit of measurement for the amount of force required to cause a change in velocity.
Types of Forces
- Contact forces: forces that require physical contact between objects, such as frictional force.
- Non-contact forces: forces that do not require physical contact, such as gravitational force and spring force.
Newton's Laws of Motion
1st Law of Motion (Law of Inertia)
- An object at rest remains at rest, or an object in motion remains in motion at a constant velocity, unless acted upon by an external force.
- Inertia is the tendency of an object to resist changes in its motion.
2nd Law of Motion
- Momentum (p) is the product of an object's mass (m) and velocity (V), and is measured in Kg m/s.
- Force (F) is the rate of change in momentum, and is measured in Newtons (N).
- F = m(V - u) / t, where u is the initial velocity and V is the final velocity.
3rd Law of Motion
- For every action, there is an equal and opposite reaction.
- The law applies to conservation of momentum and is often seen in explosions, where gas is expelled out.
Conservation of Momentum
- The total momentum before a collision is equal to the total momentum after a collision.
- Momentum is conserved in a closed system.
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