What is Newton’s second law of motion?
F = ma
Resultant Force (N) = Mass (kg) x Acceleration (m/s^2)
Acceleration is directly proportional to the resultant force,
The larger the resultant force, the larger the acceleration
What is the principle of moments?
When a body is in equilibrium, the sum of the clockwise moments about any point equals the sun of the anti-clockwise moments about the same point
F1 x d1 = F2 x d2
How might the principle of moments be demonstrated?
- Suspend and balance a meter Euler at the 50cm mark using thread.
- Adjust the position of the thread so that the ruler does not rotate.
- Hang unequal masses from either side of metre ruler.
- Adjust the position of the masses until the metre ruler is balance once again
- Gravity exerts forces F1 and F2 on the masses.
- Record the results in a table and repeat for other masses and distances
What is Hooke’s Law?
F = k x e
Force = spring constant x extension
Extension is proportional to the load, provided that the proportional limit is not exceeded
What is meant by the term pressure?
How force is distributed normally over an area
Pressure = Force / Area
P = F / A
Measured in N / m^2 or Pascals (Pa)
