Question

1. directions: use the formula work = force × distance to calculate the answers to each of the following questions. a box is pushed 40 m by a mover. the amount of work done was 2,240 j. how much force was exerted on the box? 2. a person expended 500 newtons to move a full wheelbarrow 30 meters. how much work was done? 3. directions: use the formula mechanical advantage = output force/input force to solve the following problem. a carpenter uses a crowbar to remove the top of a box. the top has a resistance of 500 n. the carpenter applies an input force of 250 n. what is the mechanical advantage of the crowbar? 4. directions: answer the following questions with complete sentences. what are two ways that machines make work easier? 5. how does a crowbar used to remove the top of a box change the direction of the force?

Explanation:

1.

Step1: Identify values

Given force $F = 500$ N and distance $d=30$ m.

Step2: Apply work - formula

Work $W = F\times d$, so $W=500\times30$.

Step3: Calculate result

$W = 15000$ J.

Step1: Identify values

Given $W = 2240$ J and $d = 40$ m.

Step2: Rearrange work - formula

$F=\frac{W}{d}$.

Step3: Calculate result

$F=\frac{2240}{40}=56$ N.

Step1: Identify values

Given mechanical advantage formula $MA=\frac{\text{output force}}{\text{input force}}$, input force $F_{in}=250$ N and resistance force (output force) $F_{out}=500$ N.

Step2: Calculate mechanical advantage

$MA=\frac{F_{out}}{F_{in}}=\frac{500}{250}$.

Step3: Get result

$MA = 2$.

Answer:

15000 J

2.