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Chapter 8
Force, Mass and Momentum
| Question | Answer |
|---|---|
| What is force | A force causes the velocity of an object to change (causes the object to speed up, slow down or change direction). |
| What is friction | Friction is a force that opposes motion. It tends to slow or stop one surface sliding across another. |
| What is The SI unit of force | The SI unit of force is the newton (N). |
| What is the symbol for force | F |
| What is the relationship between force and acceleration | The acceleration of a body is directly proportional to the force causing it. |
| What is mass and what is its SI unit | The mass (m) of a body is a measure of the amount of matter in that body. The SI unit of mass is the kilogram (kg). |
| What is the formula for force | F=ma (mass x acceleration) |
| What is a body’s centre of mass | A body’s centre of mass is the point through which the line of action of a force must pass for the body to accelerate without rotating. |
| What is weight | The weight of an object is the force of the Earth’s gravity acting on it. |
| What is the SI unit of weight | Newton (N) |
| What is the formula for mass | Weight = mass × acceleration due to gravity |
| What is a body's centre of gravity | The centre of gravity of a body is the point through which the entire weight of he body acts The centre of gravity is the same as the centre of mass for this course |
| What is the formula for momentum | Momentum = mass × velocity p = mv |
| What is the SI unit of momentum | The SI unit of momentum is the kilogram metre per second (kg m s−1). |
| What are Newtons Law's of motion | First law of motion: A body remains at rest or constant velocity unless acted on by a net external force. Second law of motion: The rate of change of a body’s momentum is directly proportional to the net force acting on it and is in the direction of the force. Third law of motion: If a body A exerts a force on a body B, then body B exerts an equal but opposite force on body A, i.e. action and reaction are equal and opposite. |
| What is the Principle of conservation of momentum | If two or more bodies interact, their total momentum before the interaction is equal to their total momentum after the interaction. m1u1 + m2u2 = m1v1 + m2v2 |
| What is the Principle of conservation of momentum when the two bodies stick together | m1u1 + m2u2 = (m1+m2)V |
Created by:
21JulianM
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