What are some examples of work?
Examples: Pushing a car horizontally from rest; shooting a bullet (the powder does the work); walking up stairs; sawing a log.
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Clarification of a concept
To be clear, most of the time carrying a box is not regarded as work because the force and the distance applied must be in the same direction for something to be classified as work.
Since you are traveling a horizontal distance while applying a vertical force to lift the box, carrying it involves zero work because the force and the distance are not applied in the same direction.
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Examples of work include lifting a box, pushing a car, typing on a keyboard, walking up stairs, and stirring a pot of soup.
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When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
- An object with a mass of #18 kg# is hanging from an axle with a radius of #15 cm#. If the wheel attached to the axle has a radius of #60 cm#, how much force must be applied to the wheel to keep the object from falling?
- A ball with a mass of #210 g# is projected vertically by a spring loaded contraption. The spring in the contraption has a spring constant of #16 (kg)/s^2# and was compressed by #7/3 m# when the ball was released. How high will the ball go?
- How does the law of conservation of energy relate to a bat hitting a baseball?
- If a rocket with a mass of 3500 tons vertically accelerates at a rate of # 1/5 m/s^2#, how much power will the rocket have to exert to maintain its acceleration at 15 seconds?
- An object with a mass of #5 kg# is hanging from an axle with a radius of #30 m#. If the wheel attached to the axle has a radius of #9 m#, how much force must be applied to the wheel to keep the object from falling?

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