RPs paper 3 and 4 Flashcards
True or false – the work done to stretch a spring is equal to the elastic potential energy stored in the spring
True – unless the limit of proportionality is exceeded
What does a linear force-extension graph mean about the force and extension?
They are directly proportional
What is the equation that links extension, force and spring constant?
Spring constant = Force / Extension
State Hooke’s Law.
Force and extension are directly proportional
What are the units for spring constant?
N/m
What is the difference between elastic and inelastic deformation?
Elastic – object returns to original size when forces are removed
What is elastic limit?
The point at which an object is deformed inelastically
How can we identify the elastic limit on a graph?
When the line of best fit starts to curve
What is the dependent variable when you investigate force and extension of a spring?
Extension of the spring
Give one control variable when investigating Hooke’s law.
Material of spring, where the length of spring is measured from and to
What are the SI units for extension?
Meters (m)
What is the equation that links gravitational field strength, mass and weight?
Weight = Mass x G.F.S
What is the equation that links elastic potential energy, extension and spring constant?
Ee = 0.5 x spring constant x extension2
Rearrange the equation in Q5 to make spring constant the subject.
Spring constant = Ee / (0.5 x extension2)
What are the units for weight?
Newtons, N
True or false? Elastic bands obey Hooke’s law.
False
What is inertia?
The tendency of an object to remain in its current state of motion
What is a vector quantity?
A quantity with both magnitude and direction
If the resultant force acting on an object is zero, what do you know about its velocity?
Velocity is constant
What is the equation that links force, mass and acceleration?
Force = Mass x Acceleration
What is the resultant force acting on an object falling at terminal velocity?
Zero
How is increasing deceleration shown on a V-T graph?
Downwards curve which gets steeper
What is the equation to calculate the acceleration?
Change in velocity / Time
What is a scalar quantity?
Quantity with magnitude only