Work and EnergySection 1 Unit 3 Lesson 1: Work Goals: Recognize the difference between the scientific and ordinary definitions of work. Define work by.

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Work and EnergySection 1 Unit 3 Lesson 1: Work Goals: Recognize the difference between the scientific and ordinary definitions of work. Define work by relating it to force and displacement. Identify where work is being performed in a variety of situations. Calculate the net work done when many forces are applied to an object.

Work and EnergySection 1 Bellringer List five examples of things you have done in the last year that you would consider work. Based on these examples, how do you define work?

Work and EnergySection 1 Work Work is done on an object when a force causes a displacement of the object. Work is done only when components of a force are parallel to a displacement.

Work and EnergySection 1 Work In physics, work is the magnitude of the force (F) times the magnitude of the displacement (d) in the same direction as the force. W = Fd What are the SI units for work? –Force units (N)  distance units (m) –Nm are also called joules (J). How much work is 1 joule? –Lift an apple weighing about 1 N from the floor to the desk, a distance of about 1 m.

Work and EnergySection 1 Work Pushing this car is work because F and d are in the same direction. Why aren’t the following tasks considered work? –A student holds a heavy chair at arm’s length for several minutes. –A student carries a bucket of water along a horizontal path while walking at a constant velocity.

Work and EnergySection 1 Practice Problem A 20.0 kg suitcase is raised 3.0 m above a platform by a conveyor belt. How much work is done on the suitcase?

Work and EnergySection 1 Practice Problem A 20.0 kg suitcase is raised 3.0 m above a platform by a conveyor belt. How much work is done on the suitcase? 5.9 x 10 2 J

Work and EnergySection 1 Work How would you calculate the work in this case? –What is the component of F in the direction of d? F cos  –If the angle is 90°, what is the component of F in the direction of d? F cos 90° = 0 –If the angle is 0°, what is the component of F in the direction of d? F cos 0° = F

Work and EnergySection 1 Work

Work and EnergySection 1 Practice Problem How much work is done on a vacuum cleaner pulled 3.0 m by a force of 50.0 N at an angle of 30.0 O above the horizontal?

Work and EnergySection 1 Practice Problem How much work is done on a vacuum cleaner pulled 3.0 m by a force of 50.0 N at an angle of 30.0 O above the horizontal? 130 J

Work and EnergySection 1 Practice Problem A tugboat pulls a ship with a constant net horizontal force of 5.00 x 10 3 N and causes the ship to move through a harbor. How much work is done on the ship if it moves a distance of 3.00 km?

Work and EnergySection 1 Practice Problem A tugboat pulls a ship with a constant net horizontal force of 5.00 x 10 3 N and causes the ship to move through a harbor. How much work is done on the ship if it moves a distance of 3.00 km? 1.50 x 10 7 J

Work and EnergySection 1 Practice Problem A weight lifter lifts a set of weights a vertical distance of 2.00 m. If a constant net force of 350 N is exerted on the weights, what is the net work done on the weights?

Work and EnergySection 1 Practice Problem A weight lifter lifts a set of weights a vertical distance of 2.00 m. If a constant net force of 350 N is exerted on the weights, what is the net work done on the weights? 7.0 x 10 2 J

Work and EnergySection 1 Practice Problem A shopper in a supermarket pushes a cart with a force of 35 N directed at an angle of 25 O downward from the horizontal. Find the work done by the shopper on the cart as the shopper moves along a 50.0 m length of aisle.

Work and EnergySection 1 Practice Problem A shopper in a supermarket pushes a cart with a force of 35 N directed at an angle of 25 O downward from the horizontal. Find the work done by the shopper on the cart as the shopper moves along a 50.0 m length of aisle. 1.6 x 10 3 J

Work and EnergySection 1 Practice Problem If 2.0 J of work is done in raising a 180 g apple, how far is it lifted?

Work and EnergySection 1 Practice Problem If 2.0 J of work is done in raising a 180 g apple, how far is it lifted? 1.1 m

Work and EnergySection 1 Practice Problem A bumble bee has a mass of about 0.3 grams. Suppose the bee does 0.04 J of work against gravity, so that it ascends straight up with a net acceleration of 1.0 m/s 2. How far up does it move?

Work and EnergySection 1 Practice Problem A bumble bee has a mass of about 0.3 grams. Suppose the bee does 0.04 J of work against gravity, so that it ascends straight up with a net acceleration of 1.0 m/s 2. How far up does it move? Answer

Work and EnergySection 1 Work is a Scalar Work can be positive or negative but does not have a direction. What is the angle between F and d in each case?

Work and EnergySection 1 Homework Due Next Class

Work and EnergySection 1 Ticket Out Determine whether work is being done in each of the following examples a.A train engine pulling a loaded boxcar initially at rest. b.A tug of war that is evenly matched c.A crane lifting a car Choose one of the examples above and explain your answer.

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