GCSE - Topic 2 - Forces, Moments and Elasticity - Year 9 Flashcards
What is the equation for moments?
Moments = Force X Distance
“Mmm! Flour Dumplings.”
What is a moment?
The turning effect of a force.
What is the law of moments?
If the anticlockwise moments equal the clockwise moments, the system will balance.
How do you get a larger moment?
- Apply a larger force
- A longer distance
What is the equation for force, spring constant and extension?
Force = Spring constant X Extension
F = K x E
“Fancy Kissing Elvis!”
What is the spring constant?
How stiff the spring is. The stiffer the spring, the greater the spring constant.
What’s the elastic limit?
The furthest point it can be stretched or deformed while being able to return to its previous shape.
What’s Hooke’s law?
The extension of a spring is directly proportional to the force applied, provided its limit of proportionality has not been exceeded.
What is the limit of proportionality?
It refers to the point beyond which Hooke’s law is no longer true when stretching the material.
The material can no longer return to its previous shape after this point has been reached.
What’s a vector quantity?
Something that has a magnitude and direction.
What’s a scalar quantity?
Something that has a magnitude - no direction.
What’s an example of a scalar quantity?
Speed Distance Mass Temperature Time
What’s an example of a vector quantity?
Force Velocity Displacement Acceleration Momentum
What’s an example of a contact force?
Friction
Air resistance
Tension in ropes
Normal contact force
What’s an example of a non-contact force?
Magnetic force
Gravitational force
Electrostatic force
