A block lies on a plank with μ = 0.2. Initially both are at rest, then the plank suddenly starts with acceleration a₀ = 4 m s⁻². In the first 1 s, which statements are correct? Take g = 10 m s⁻².
Select all that apply

Question

A block lies on a plank with μ = 0.2. Initially both are at rest, then the plank suddenly starts with acceleration a₀ = 4 m s⁻². In the first 1 s, which statements are correct? Take g = 10 m s⁻².

Select all that apply

G1 Physics · Accepted Answer

Maximum acceleration friction can give the block is μg = 2 m s⁻², less than the plank's 4 m s⁻², so slipping occurs. In 1 s, plank displacement is ½(4)(1²)=2 m and block displacement is ½(2)(1²)=1 m. Thus A and B.