Podcast
Questions and Answers
Which of the following best describes the center of mass of an object?
Which of the following best describes the center of mass of an object?
- The point where the object is most dense.
- The point where the object experiences the most air resistance.
- The geometric center of the object's shape.
- The point where the object's entire weight appears to act. (correct)
Friction between two surfaces depends on the area of contact between the surfaces.
Friction between two surfaces depends on the area of contact between the surfaces.
False (B)
What force causes a dropped object to eventually stop accelerating and reach terminal velocity?
What force causes a dropped object to eventually stop accelerating and reach terminal velocity?
air resistance
In a Class 1 lever, the ______ is positioned between the load and the effort.
In a Class 1 lever, the ______ is positioned between the load and the effort.
Match each type of lever with its description:
Match each type of lever with its description:
What is the relationship between the normal reaction force (N) and the maximum static friction force (fmax) between two surfaces?
What is the relationship between the normal reaction force (N) and the maximum static friction force (fmax) between two surfaces?
An object is being pulled across a surface at a constant velocity. Which statement is correct regarding the pulling force (Fpull) and the friction force (f)?
An object is being pulled across a surface at a constant velocity. Which statement is correct regarding the pulling force (Fpull) and the friction force (f)?
The 'moment of a force' is a measure of its pushing/pulling effect.
The 'moment of a force' is a measure of its pushing/pulling effect.
What condition is achieved when an object falling through the air experiences a net force of zero?
What condition is achieved when an object falling through the air experiences a net force of zero?
According to the principle of moments, at equilibrium, the sum of the clockwise moments equals the sum of the ______ moments.
According to the principle of moments, at equilibrium, the sum of the clockwise moments equals the sum of the ______ moments.
Flashcards
Centre of Gravity/Mass
Centre of Gravity/Mass
The point in an object through which its entire weight appears to act.
Friction
Friction
Force resisting motion between surfaces.
Air resistance
Air resistance
Friction experienced in air.
Terminal Velocity
Terminal Velocity
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Lever
Lever
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Moment (Torque)
Moment (Torque)
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Gravitational Force
Gravitational Force
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Principle of Moments
Principle of Moments
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Maximum friction force
Maximum friction force
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Classes of Lever
Classes of Lever
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Study Notes
- These notes cover types of forces, center of mass/gravity, friction, levers, and fundamental forces
Learning Goals for Types of Force
- Centre of Mass is a key concept
- Friction is a type of force to be examined
- Air Resistance is a type of force to be examined
- Levers are to be looked at including Class 1, Class 2 (ankle), and Class 3 (elbow) levers
- Fundamental Forces are to be examined including Gravity
Centre of Gravity/Mass
- Large objects have many parts acted on by gravity, but don't need to be treated separately
- Every object has a point through which its entire weight (mg) appears to act
- The point through which the entire weight acts is the centre of gravity or centre of mass
Finding the Centre of Gravity
- Can be found by pivoting and hanging a plumb bob
Friction
- The force between two surfaces, parallel to the surfaces
- It always opposes relative motion
Friction at Rest or Constant Velocity
- Friction (f) equals the pulling force (Fpull)
Definition of Friction
- Maximum friction force (fmax) between two surfaces is μN
- N is the normal reaction (often N = mg, but not always)
- μ is the coefficient of friction, generally less than 1, often significantly less, especially in animal joints
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