Nowton's third law 52. If the mother pushes her daughter to the right with a force of 160 N, with what magnitude of force does the daughter push Бя о8 her mother? 53. Determine the magnitude of the mother's acceleration during her 160 N push on her daughter. 56. An object is supported by a vertical spring attached to the ceiling. What are the forces acting on the object? 57. A girl pushes a 10 kg box from rest across a horizontal floor with a force of 50 N. The forceof friction opposing her is 45 N. If the box uniformly accelerates from rest to a final velocity of 2.0 m/s, how much time did it take to get to that velocity? 64. A girl pushes a 10 kg crate to the right across the floor with a constant force of 10N against a force of friction. The box accelerates to the right at a rate of 0.1 m/s/s. What is the magnitude of the opposing frictional force? 70. A car's wheels are locked as it skids past you to the right. The coefficient of friction between the road and the tires is 0.5. Draw a free body diagram that represents the relative size and direction of the relevant forces on the car. mp=2 kg

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Q: the force exerted by gravity on 70 kg = N. O 10 О 68 О 66

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Q: How does changing the applied force affect acceleration?

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Newton's First Law of Motion

If a very smooth ball is rolled down an inclined surface with zero friction, the ball will continue to roll indefinitely for an infinite time, in an attempt to reach to the same height on the opposite hill!