## Required Speed

**You’re driving your pickup truck around a curve with a radius of 22 m . A box in the back of the truck is pressed up against the wall of the truck.**

**How fast must you drive so that the force of the wall on the box equals the weight of the box?**

**Known Variables:**

**radius (r): 22 m**

**gravity (g): 9.8**

*“Centrifugal force represents the effects of inertia that arise in connection with rotation and which are experienced as an outward force away from the center of rotation.”*

**Since its a truck moving around a circle, we assume that it would be centrifugal force.**

**Centrifugal force Fc **= m x v2 / r

Weight = mg

As required by the question

**Fc** = W

v^{2} /r = g

given radius r = 22 m

v^{2} /22 = 9.8

**Solve for v
required speed**

**v =**√(22 * 9.8)

= 14.35 m/s

**v**=15 m/s

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