1. A 24.5 kg child sits on a bathroom scale which is placed on the seat of a swi

Question

1. A 24.5 kg child sits on a bathroom scale which is placed on the seat of a swing.  What does the scale read when the swing is at rest?  The child begins to swing back and forth until she reaches a maximum height of 0.85 meters(measured vertically) above the low point.  What will the scale read as she passes the low point?  The swing is 3.0 meters long.

2. A ball of mass 0.350 kg is swung at the end of a 2.40 m string such that the plane of its path is horizontal and the circle it moves in has a radiusof 1.40 m.  Find the tension in the string and the angle which the string makes with the vertical.

3. A ball of mass 0.250 kg is attached to a string 0.750 m long.  The ball is swung in a pendulum-type motion such that it has a speed of 6.40 m/s when it reaches the lowest point in its path.  What is the corresponding tension in the string?

Explanation / Answer

a) 24.5 kg, or 9.8x24.5 = 240 newtons depending on the scale. They all read in kg, but classroom problems are in newtons.

b) you need to calculate the speed, and you can do that via energy exchange.

Kinetic Energy in J if m is in kg and V is in m/s

KE =

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