Unbalanced forces and acceleration

Question 1

For helical springs and metal wires

Answer 1

• F=kX
• k is the gradient when plotting force against extension
• When the elastic limit is passed the spring will remain deformed
• A=FX/2=Work done
• Area under graph=Work done

Question 2

For elastic bands

Answer 2

• Hysteresis curve => different trends for loading and unloading
• A(below loading)=total energy of system
• A(below unloading)=useful energy
• A(inbetween)=thermal energy lost

Question 3

What is Hooke’s Law?

Answer 3

The extension of an elastic object is directly proportional to the force applied up to the limit of proportionality

Question 4

What is elastic behaviour?

Answer 4

The ability of a material to recover its original shape once the forces causing deformation have been removed

Question 5

F

Answer 5

m*a

Question 6

Terminal velocity

Answer 6

When there is no resultant force (weight and air resistance are equal) and no acceleration. It is the maximum velocity a falling object can reach

Question 7

Greater speed

Answer 7

Greater air resistance