Work of a constant force Scalar product between vectors

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Presentation transcript:

Work of a constant force Scalar product between vectors Chapter 6 – part A Work of a constant force Scalar product between vectors

Exercise 6.1 A block of mass 2.50 kg is pushed 2.20 m along a frictionless horizontal table by a constant 16.0-N force directed 25.0° below the horizontal. Determine the work done on the block by (a) the applied force, (b) the normal force exerted by the table, (c) the gravitational force. (d) Determine the total work done on the block.

Exercise 6.2 2. A shopper in a supermarket pushes a cart with a force of 35.0 N directed at an angle of 25.0° downward from the horizontal. Find the work done by the shopper on the cart as he moves down an aisle 50.0 m long.

Exercise 6.4 4. A raindrop of mass 3.35 × 10–5 kg falls vertically at constant speed under the influence of gravity and air resistance. Model the drop as a particle. As it falls 100 m, what is the work done on the raindrop (a) by the gravitational force and (b) by air resistance?

Exercise 6.5 5. Find the scalar product of the vectors in Figure below.

Exercise 6.6 6. For any two vectors and , show that · = AxBx + AyBy + AzBz

Exercise 6.7 7. A force N acts on a particle that undergoes a displacement m. Find (a) the work done by the force on the particle and (b) the angle between and .

Exercise 6.8