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?

kg

What is the normal force exerted on the lawn mower?

N

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

25 kg and 299 N

Explanation:

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