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Answer:
The minimum force to start the block moving up the wall = 49 N
Explanation:
Friction: This is the force that tend to oppose the motion of two bodies in contact. The S.I unit of frictional force is Newton (N)
The minimum force required to start the block moving up the wall = Frictional Force.
I.e F = Frictional force.
And, F = μR..........................Equation 1
Where μ = coefficient of static friction, R = Normal reaction.
But R = mg ( on a level surface).................. Equation 2
Where m = mass, g = acceleration due to gravity.
Given: m = 10 kg,
Constant: g = 9.8 m/s²
substituting these values into Equation 2
R = 10 × 9.8
R = 98 N.
Also given: μ = 0.50
Substituting these values into equation 1
F = 98 × 0.5
F = 49 N.
Therefore The minimum force to start the block moving up the wall = 49 N
Answer:
-20 kg.m/s
Explanation:
We have an object moving at 5 m/s with mass 5 kg. The initial momentum is:
pi = m × vi
pi = 5 kg × 5 m/s = 25 kg.m/s
It undergoes a quick collision with some other object and now moves at 1 m/s. The final momentum is:
pf = m × vf
pf = 5 kg × 1 m/s = 5 kg.m/s
The change in the object's momentum is:
Δp = pf - pi
Δp = 5 kg.m/s - 25 kg.m/s = -20 kg.m/s
D. A rocket pushes gases backward while the gases push the rocket forward
Newton’s third law: for every action there is and equal and opposite reaction
