I am supposed to fill in the blanks without a word bank.

1. I you push a crate with 40 N of force at an angle of 30 degrees and your friend pushes with a force of 40 N horizontally, the amount of work you are doing is _____ the amount of work your friend is doing on the crate

my answer: equal to

2. Kinetic friction does ____ work on moving objects

my answer: negative

3. as you carry books across the room, the work done by gravity on the books is ____

my answer: 9.8 N/kg

1. F1 = 40*cos30=34.64 N., Horizontally.


F2 = 40N., Horizontally.

My answer: less than.

2. My answer: its'

1. To determine the amount of work you are doing compared to your friend, we need to analyze the situation.

First, let's calculate the work done by each of you:

- You are pushing the crate at an angle of 30 degrees with a force of 40 N. To calculate the work done by you, we use the formula W = F * d * cos(theta), where F is the force applied, d is the displacement, and theta is the angle between the force and the displacement. In this case, the angle theta is 30 degrees. So, the work you are doing is (40 N) * (d) * cos(30°).

- Your friend is pushing the crate horizontally, so the angle theta is 0 degrees. The formula for work in this case simplifies to W = F * d * cos(theta), where F is the force applied, d is the displacement, and cos(theta) is equal to 1 because cos(0°) = 1. So, the work your friend is doing is simply (40 N) * (d) * cos(0°).

Comparing the two equations, we can see that cos(30°) ≠ cos(0°). Therefore, the amount of work you are doing is not equal to the amount of work your friend is doing on the crate. The correct answer should be different from "equal to".

2. Kinetic friction is a type of friction that occurs between two objects when they are moving relative to each other. It acts in the opposite direction to the motion, thus opposing the object's movement.

Since friction acts against the motion, it does negative work on moving objects. This means that the work done by kinetic friction is negative. It's important to note that negative work doesn't mean no work is being done; it signifies that the work is being done in the opposite direction of the displacement.

Therefore, the correct answer is "negative".

3. When you carry books across the room, the work done by gravity on the books is dependent on the object's motion relative to the vertical direction.

Since you are carrying the books horizontally, there is no vertical displacement. This means that the work done by gravity on the books is zero. Gravity only does work when there is a vertical displacement, while horizontal movement doesn't affect the work done by gravity in this scenario.

Hence, the correct answer is "zero" or "no work".