Forces and their interactions 1

Created by

Emilia Hala

Cards (22)

Give examples of scalar quantities 
Distance, speed
What is a vector quantity?
Has both size and direction
Give examples of vector quantities
Forces, velocity, displacement
What is a scalar quality
Only has size (magnitude)
What is a contact force
When objects are physically touching
Give examples of a contact force 
Friction
Air resistance
Tension
Normal Contact force
What is a non-contact force?
When objects are not physically touching
Give examples of a non-contact force
Gravity, magnetic force, electrostatic force
What is resultant force?
Overall force on an object
What is the name of the force acting on an object due to gravity?
Weight
What is the equation for calculating weight?
Weight (N) = mass (kg) x gravitational field strength (N/kg)
W = mxg
What is the centre of mass? 
The point on an object where the weight seems to act
What is work done?
The energy transferred when a force moves an object
What is the equation for calculating work done?
Work done (J) = Force (N) x distance (m)
W= Fxd
What is the equation for calculating power?
Energy (J) = Power (W) x time (s)
E= Pxt
What is an elastic object (or elastic deformation)? 
An object which goes back to its original shape (after forces are removed)
What is an inelastic object (or inelastic deformation)? 
When an object does not go back to its original shape (after forces are removed)
What is the relationship between force and extension?
Directly proportional
What does the spring constant (k) tell us about a spring?
How stiff it is (greater the constant, more stiff it is)
What is the equation for the relationship between force and extension? 
Force (N) = spring constant (N/m) x extension (m)
F =k x e
How do you find the spring constant from a force-extension graph? 
Gradient
What is the equation for calculating elastic potential energy?
Energy (I) = ½ x spring constant (N/m) x extension (m)
E = ½ ke