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9. Work & Energy

Intro to Calculating Work

9. Work & Energy

Intro to Calculating Work

Scelta multipla
In introductory physics, the product of a force acting over a displacement is the definition of which quantity?
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In introductory physics, the use of force to move an object through a displacement is called what quantity?
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In introductory physics, the product of a force acting over a distance in the direction of the force is the definition of what quantity?
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How much work is done when a constant force of $60 N$ is used to pull a sled a distance of $5 m$ in the direction of the force?
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A particle of mass $250 g$ moving along the x axis has velocity $v_{x} = (7.6 x^{3}) m / s$ with x measured in m. How much work is done on the particle as it moves from $x = 0.0 m$ to $x = 2.0 m$ ?
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You pull a 5kg box vertically up with a constant 100N force for 2m. How much work do you do?
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You push a 3kg box against a wall for a distance of 2m with a force of 40N that makes a 53° angle with the horizontal, as shown. Calculate the work done by gravity.

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A $1000 kg$ pallet of bricks is being lowered to the ground by a crane. If the bricks are moving at a constant speed, how much work is done by the cable on the bricks as they descend $11 m$ ?
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