A boy is exerting a force of 70 N at a 50-degree angle on a lawn mower. He is accelerating at 1.8 m/s2. Round the answers to the
nearest whole number.
What is the mass of the lawn mower?
What is the normal force exerted on the lawn mower?
2 answers:
The mass is 25kg and the normal force is 299N
The mass of the lawn mower can be calculated from the expression force is equal to the product of mass and acceleration. We do as follows:
F = ma
70 = m(1.8)
m = 38.89 kg
The normal force is the upward force perpendicular with the object. For this case it is equal with Wcos(50). We calculate as follows:
Fn = Wcos50 = 38.89(9.81)(cos50) = 245.23 N
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