Worksheets10th U1 Friction Forces
Total questions: 15
Worksheet time: 29mins
How much is the mass?
5 kg
5 x 10 = 50 kg
10 kg
5 x 10 = 50N
What is weight?
Forced pulled by the planet to its center
Forced pulled by the planet to its space
Forced pushed by the planet to its center
Forced pushed by the planet to its space
What is the weight of this mass?
W = (5kg)(10m/s2) = 50N
W = (5kg)(10) = 50Kg
W = (5)(10) = 15N
W = (5)(10) = 15kg
What does the vertical red arrow indicate?
Weight
Normal force
Applied Force (Fapp)
Friction Force
What does the Blue arrow indicate?
Weight
Normal force (also known as Reaction, R)
Applied Force (Fapp)
Friction Force
How much is the Normal Force?
N = weight = 5kg
N = weight = 50N
N = mass = 5kg
If Ffs =μ s•N and
μs=0.6 and μd=0.4
Find the maximum static force of friction.
(0.6)(50) = 30N
(0.6)(50) = 30kg
(0.4)(50N) = 20N
(0.4)(50N) = 20kg
If Ffs = μs•N and
μs=0.6 and μd=0.4
Find the dynamic force of friction.
(0.6)(50) = 30N
(0.6)(50) = 30kg
(0.4)(50N) = 20N
(0.4)(50N) = 20kg
If μs=0.6 and μd=0.4
Is it moving if we apply 25N?
No, because is less than 0.6*50N=30N
No, because is less than 5kg
Yes, because is less than 0.6*50N=30N
Yes, because is more than 5kg
If μs=0.6 and μd=0.4
If we apply 25N, what is the type of friction experiencing?
Static, 25N is less than 0.6*50N
Dynamic, 25N is less than 0.6*50N
Static, 25N is less than 5kg
Dynamic, 25N is less than 5kg
If μs=0.6 and μd=0.4
Is it moving if we apply 30N?
No, because Fapp needs to be greater than 0.6*50N
No, because Fapp is less than 0.4*50N
Yes, because Fapp needs to be greater than 0.6*50N
Yes, because Fapp is less than 0.4*50N
If μs=0.6 and μd=0.4
If we apply 30N, what is the type of friction experiencing?
Static, 30N is less or equal than 0.6*50N
Dynamic, 30N is less or equal than 0.6*50N
Static, 30N is less than 5kg
Dynamic, 30N is less than 5kg
If μs=0.6 and μd=0.4
Is it moving if we apply 35N?
No, because Fapp needs to be greater than 0.6*50N
No, because Fapp is less than 0.6*50N
Yes, because Fapp is greater than 0.6*50N
Yes, because Fapp is less than 0.6*50N
If μs=0.6 and μd=0.4
If we apply 35N, what is the type of friction experiencing?
Static, 35N is less or equal than 0.6*50N
Dynamic, 35N is less or equal than 0.6*50N
Static, 35N is greater than 0.6*50N
Dynamic, 35N is greater than 0.6*50N
If μs=0.6 and μd=0.4
If we apply 35N, Do we have dynamic friction?
Yes, 35N is greater than Ffs max,
Ffd=0.4*50
Yes, 35N is greater than Ffs max,
Ffd=0.6*50
No, 35N is less than Ffs max,
