UNIT 2 Flashcards
1
Q
Gravity =
A
10 N/kg
2
Q
Weight ( in Newtons )
A
Weight ( N ) = mass ( kg ) x gravitational field strength ( N/ kg )
3
Q
Density
A
Density = mass / volume or p = m / V
4
Q
- What does hooke’s law state ?
2. Equation for Hooke’s law :
A
- Hook’s law for springs states that the extension of a spring is directly proportional to the weight it supports
- F= kx ( F is stretching force or tension, x is the extension and k is the spring constant.
5
Q
How do you calculate the extension of a material
A
Extension = length at that stage - its initial length.
6
Q
Resultant force
A
Resultant Force = N ( mass) x Acceleration ( m/s 2 )
F= ma
Rearranging —
7
Q
Momentum
Unit of momentum
Conservation of momentum equation
A
Momentum = mass x velocity
Unit is ; kg m/s
Conservation of momentum —> m1V1 + m2V2 = m3V3
8
Q
Impulse
What is the impulse of a force ?
Why is it this equation ? (UNIT 2.8)
A
Ft= mv - mu
The impulse of a force ( Ft ) = the change in momentum ( mv - mu )
