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Q. 45

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Physics for Scientists and Engineers: A Strategic Approach with Modern Physics
Found in: Page 229

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Short Answer

Susan’s kg baby brother Paul sits on a mat. Susan pulls the mat across the floor using a rope that is angled above the floor. The tension is a constant N and the coefficient of friction is . Use work and energy to find Paul’s speed after being pulled m.

Paul's speed after being pulled m is m/s

See the step by step solution

Step by Step Solution

Step 1. Given Information

Mass kg

Tension N

the coefficient of friction

Step 2. Find the magnitude of friction

We use second Newton's law for direction perpendicular to motion, or direction

Friction is defined as

Step 3. Work done by friction if Paul is pulled  m

Step 4. Work done by rope on Paul

Step 5. Total work done on mat and Paul

Step 6. Find Paul's speed

From the work-kinetic theorem, we can calculate Paul's speed

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