YR 2 Topic 5 (mechanics)

Question 1

opposite to the angle

Answer 1

sin component

Question 2

adjacent to the angle

Answer 2

cos component

Question 3

particle moves along an inclined plane

Answer 3

resolve forces:

• in direction of motion (parallel to plane)
• perpendicular to direction of motion (perpendicular to plane)

Question 4

friction

Answer 4

force which opposes motion

Question 5

frictional forces are dependent on

Answer 5

1. normal reaction between object and surface

2. the roughness between the 2 surfaces of contact

Question 6

roughness

Answer 6

measure using the coefficient of friction μ
0< or equal μ < or equal 1
rougher surface bigger value of μ
smooth surface no friction and μ=0 (icy = close to 0 coarse sandpaper = 1

Question 7

friction is only at maximum value at

Answer 7

limiting equilibrium

the particle is moving

Question 8

maximum or limiting value of the friction Fmax is given by

Answer 8

Fmax = μR

Question 9

always resolve forces

Answer 9

in the direction of motion or perpendicular to the direction of motion