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# Forces

Forces. Answers. #1. Known mass = 40 kg g Earth = 9.8 m/s 2 g Jupiter = 25.0 m/s 2 mass is constant…. #2. Known m = 23.0 g F = 3.00 N force is kg m/ s 2 , so, have to convert to kg F = ma. #3. Known m arrow = 29.0g needs to be in kg d = 7.00 cm needs to be in m Télécharger la présentation ## Forces

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2. #1 • Known • mass = 40 kg • g Earth = 9.8 m/s2 • g Jupiter = 25.0 m/s2 • mass is constant….

3. #2 • Known • m = 23.0 g • F = 3.00 N • force is kg m/ s2, so, have to convert to kg • F = ma

4. #3 • Known • m arrow = 29.0g needs to be in kg • d = 7.00 cm needs to be in m • v i = 30.0 m/s • v f = 24.0 m/s • F = ma • need to find a • a = Δv/t or Δv2/2d

5. #4 • Known • m barbell = 225.0 kg • g sun = 274 m/s2 • F = ma

6. #5 • m baseball = 0.15 kg • a = 3.0 x 104 m/s2 • F = ma

7. #6 • Known • v axe = 26.0 m/s • d imbedded in tree = 2.4 cm • m axe = 2.5 kg • looking for force, what formula do we know? • F = ma (need to find a) • vf2=vi2 + 2gd (remember, g is just an acceleration)

8. #7 • known • m Mr. LeBlanc = 116 kg • μ = 0.0500 • Ff = μFN

9. #8 • known • θ = 26.0º • m Martin = 50. kg • μ = 0.10 • a = 9.8m/s2 • Ff = μFN 26.0º FN mg 26.0º

10. #9 • Known • m combined = 81 kg • θ = 29º (with the vertical) • tension will be the force in the rope • F = ma 29º

11. #10 • known • m box = 12.5 kg • weight will be distributed between each arm • F = ma (1/2 the mass is supported by each arm)

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