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Motion & Force Science 8 Laws 1 & 2 and app problems Name:__________KEY____________________ #3 Date:________________ Hr:_____ 1. Infer whether the inertia of an object changes as the object’s velocity changes. Inertia depends on mass, and doesn’t effect the speed or direction of an object. 2. Explain why the net force on an object that is traveling at a constant speed in a straight line is equal to 0N. If there is no change in motion, then forces are balanced. When the forces are balanced the net for is 0N. Constant speed and straight line indication that no change in motion is being made. 3. What must be occurring to the forces on an object at rest? If an object is at rest, and no change in occurring then the forces must be balanced. 4. If the mass of a helicopter is 5225 kg, and the net force on it is 16,500 N, what is the helicopter’s acceleration? Info given What are you asked to find? Formula Substitute and solve (show work with units) Answer that includes units m= 5225 kg F=16,500 N Acceleration? a=F/m a = 16,500 N / 5225 kg a=3.16 m/s/s 5. What is the net force on a dragster with a mass of 1200 kg if its acceleration is 31.23 m/s/s? Info given m =1200 kg What are you asked to find? Force? Formula F=mxa Substitute and solve (show work with units) F = 1200 kg x 31.23 m/s/s Answer that includes units F=37,476 N a = 31.23 m/s/s 6. A car is being pulled by a tow truck. What is the car’s mass if the net force on the car is 6500N and it has an acceleration of 2.7 m/s/s? Info given What are you asked to find? Formula Substitute and solve (show work with units) Answer that includes units F = 6500 N Mass? m = F/a m = 6500 N / 2.7 m/s/s a = 2.7 m/s/s m= 2407.41 kg 7. You push yourself on a skateboard with a force of 30 N and accelerate at 0.5 m/s/s. Find the mass of you and the skateboard together. Info given What are you asked to find? Formula Substitute and solve (show work with units) Answer that includes units F= 30 N a = 0.5 m/s/s Total mass? m = F/a M = 30 N / 0.5 m/s/s m= 60 kg 8. You push a book that has a mass of 2.0 kg so that it has an acceleration of 1.0 m/s/s. What is the net force on the book? Info given m = 2.0 kg a = 1.0 m/s/s What are you asked to find? Force Formula F=mxa Substitute and solve (show work with units) F = 2.0 kg x 1.0 m/s/s Answer that includes units F=2 N Force & Motion Science 8 Laws 1 & 2 and app problems #3 Name:______________________________ Date:________________ Hr:_____ 1. Infer whether the inertia of an object changes as the object’s velocity changes. 2. Explain why the net force on an object that is traveling at a constant speed in a straight line is equal to 0N. 3. What must be occurring to the forces on an object at rest? 4. If the mass of a helicopter is 5225 kg, and the net force on it is 16,500 N, what is the helicopter’s acceleration? Info given What are you asked to find? Formula Substitute and solve (show work with units) Answer that includes units 5. What is the net force on a dragster with a mass of 1200 kg if its acceleration is 31.23 m/s/s? Info given What are you asked to find? Formula Substitute and solve (show work with units) Answer that includes units 6. A car is being pulled by a tow truck. What is the car’s mass if the net force on the car is 6500N and it has an acceleration of 2.7 Info given What are you asked to find? Formula m/s/s? Substitute and solve (show work with units) Answer that includes units 7. You push yourself on a skateboard with a force of 30 N and accelerate at 0.5 m/s/s. Find the mass of you and the skateboard together. Info given What are you asked to find? Formula Substitute and solve (show work with units) Answer that includes units 8. You push a book that has a mass of 2.0 kg so that it has an acceleration of 1.0 m/s/s. What is the net force on the book? Info given What are you asked to find? Formula Substitute and solve (show work with units) Answer that includes units