Question

Quiz
Question 1 (3 points)

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How do machines make work easier?

Question 1 options:

By changing the size or direction of the force


By decreasing the amount of work done


By changing only the size of the force


By changing only the direction of the force

Question 2 (3 points)

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What are the SI units for power?

Question 2 options:

Watt


Force


Newton


Joule

Question 3 (3 points)

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What must occur when you apply force to an object in order to do work?

Question 3 options:

float


move some distance


create friction


obey

Question 4 (3 points)

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A machine's ____________ is the number of times the machine multiplies your effort force.

Question 4 options:

mechanical advantage


efficiency rating


output distance


work input

Question 5 (3 points)

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If a machine is very efficient, what would the actual mechanical advantage be closest to?

Question 5 options:

output force


input force


direction


ideal mechanical advantage

Question 6 (3 points)

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In which example is work being done?

Question 6 options:

picking up a pile of books from the floor


propping a stack of books against a table


dropping a stack of books onto a table


holding a heavy stack of books while standing

Question 7 (3 points)

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Which statement is correct about simple machines?

Question 7 options:

Simple machines do not affect the perceived difficulty level of work.


Simple machines make work harder to do by increasing the amount of work done.


Simple machines make work easier to do by decreasing the amount of work done.


Simple machines make work easier to do, even though the amount of work actually done is the same.

Question 8 (3 points)

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Which of the following is an example of work according to the scientific definition of work?

Question 8 options:

reading a chapter in a novel for Social Studies


walking up a hill


pushing a wheelbarrow


studying for a test

Question 9 (3 points)

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What do you do when you lift an object off the floor onto a shelf?

Question 9 options:

force


power


work


watts

Question 10 (3 points)

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Which of the following describes compound machines?

Question 10 options:

Machines used to make mixtures.


Combinations of simple machines.


Machines that use gears.


Machines that use wheels.

Question 11 (3 points)

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How does a ramp make it easier to move a heavy object a certain distance?

Question 11 options:

by decreasing the distance the object moves


by changing the direction in which the object moves


by decreasing the amount of work required to move the object


by decreasing the amount of force required to move the object

Question 12 (3 points)

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In a basketball game, what is NOT considered to be work done on an object?

Question 12 options:

throwing the ball to a teammate


slam-dunking the ball


running down the court without the ball


dribbling the ball in place

Question 13 (3 points)

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Give the net force of all the vectors in the image below. Remember to give direction.

fb 5

Question 13 options:
Question 14 (3 points)

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When a machine increases the size of the force exerted, what happens to the distance?

Question 14 options:

must increase


must double


must decrease


must stay the same

Question 15 (3 points)

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What is the net force on an object when you combine a force of 10 N north with a force of 5 N south?

Question 15 options:

5 N north


15 N north


5 N south


50 N north

Question 16 (3 points)

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Distance : meter :: work : _______.
(This is an analogy - if you have never seen one before, just read it as, " Distance is to meter as work is to ____." That means once you know the relationship between distance and meter, you need to remember the word that has that same relationship with the idea of work.

Question 16 options:

Newton


Feet


Watts


Joule

Question 17 (3 points)

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You push a 75 N box 3m across the floor. How much work has been done?

Question 17 options:

225 J


15 J


26 J


75 N

Question 18 (3 points)

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Which of the following actions do more work on an object?

Question 18 options:

lifting an 80 N box 1 m up off the floor


lifting a 90 N box 2 m up off the floor


lifting a 160 N box 1 m up off the floor


lifting a 100 N box 1.5 m up off the floor

Question 19 (3 points)

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Give the net force for the following vectors in the image below.

vector

Question 19 options:
Question 20 (3 points)

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Give the net force for the following free body diagram.

fb1

Question 20 options:
Question 21 (3 points)

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Juan and Anita each lift an identical stack of books. Juan lifted the stack a distance 2 meters and Anita lifted the stack a distance of 1.5 meters. Which of the following answers correctly identifies and explains who did more work?

Question 21 options:

Juan because he lifted the stack a greater distance.


Juan because he lifted the stack a lesser distance.


Anita because she lifted the stack a lesser distance.


Anita because she lifted the stack a greater distance.

Question 22 (3 points)

Listen
Give the net force for the following free body diagram.

fb 3

Question 22 options:
Question 23 (3 points)

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A man applies a force of 500 N to push a truck 10 m down the street. How much work has been done?

Question 23 options:

500 J


510 J


5,000 J


50 J


0 of 23 questions saved
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Answer 1

for question 13 0.55 m is pointing up and 0.70 m is too, 0.95 m and 1.60 are pointing down
question 19: 2.8 m and 5.6 and 4.2 m are pointing right and 3.8 m are pointing right
question 20: there is a box in the middle and 15 N is going up and 5 N is going down
question 22: there's a box and 2N is going left 25N is going right and 20 N is going up and down

Answer 2

Here are the answers to your quiz questions:

**Question 1:** How do machines make work easier?
- **Answer:** By changing the size or direction of the force

**Question 2:** What are the SI units for power?
- **Answer:** Watt

**Question 3:** What must occur when you apply force to an object in order to do work?
- **Answer:** move some distance

**Question 4:** A machine's ____________ is the number of times the machine multiplies your effort force.
- **Answer:** mechanical advantage

**Question 5:** If a machine is very efficient, what would the actual mechanical advantage be closest to?
- **Answer:** ideal mechanical advantage

**Question 6:** In which example is work being done?
- **Answer:** picking up a pile of books from the floor

**Question 7:** Which statement is correct about simple machines?
- **Answer:** Simple machines make work easier to do, even though the amount of work actually done is the same.

**Question 8:** Which of the following is an example of work according to the scientific definition of work?
- **Answer:** pushing a wheelbarrow

**Question 9:** What do you do when you lift an object off the floor onto a shelf?
- **Answer:** work

**Question 10:** Which of the following describes compound machines?
- **Answer:** Combinations of simple machines.

**Question 11:** How does a ramp make it easier to move a heavy object a certain distance?
- **Answer:** by decreasing the amount of force required to move the object

**Question 12:** In a basketball game, what is NOT considered to be work done on an object?
- **Answer:** running down the court without the ball

**Question 13:** Give the net force of all the vectors in the image below. Remember to give direction.
- **Answer:** (Not applicable without the image context; please provide the vectors to answer this.)

**Question 14:** When a machine increases the size of the force exerted, what happens to the distance?
- **Answer:** must decrease

**Question 15:** What is the net force on an object when you combine a force of 10 N north with a force of 5 N south?
- **Answer:** 5 N north

**Question 16:** Distance : meter :: work : _______.
- **Answer:** Joule

**Question 17:** You push a 75 N box 3m across the floor. How much work has been done?
- **Answer:** 225 J (Work = Force × Distance = 75 N × 3 m)

**Question 18:** Which of the following actions do more work on an object?
- **Answer:** lifting a 90 N box 2 m up off the floor (Work = Force x Distance; 90 N × 2 m = 180 J, which is more than the others)

**Question 19:** Give the net force for the following vectors in the image below.
- **Answer:** (Not applicable without the image context; please provide the vectors to answer this.)

**Question 20:** Give the net force for the following free body diagram.
- **Answer:** (Not applicable without the image context; please provide the details to answer this.)

**Question 21:** Juan and Anita each lift an identical stack of books. Juan lifted the stack a distance 2 meters and Anita lifted the stack a distance of 1.5 meters. Which of the following answers correctly identifies and explains who did more work?
- **Answer:** Juan because he lifted the stack a greater distance.

**Question 22:** Give the net force for the following free body diagram.
- **Answer:** (Not applicable without the image context; please provide the details to answer this.)

**Question 23:** A man applies a force of 500 N to push a truck 10 m down the street. How much work has been done?
- **Answer:** 5,000 J (Work = Force × Distance = 500 N × 10 m)

Please provide the relevant images or vectors for Questions 13, 19, 20, and 22 if you would like specific answers for those.

Answer 3

Based on the information provided for the vectors in Questions 13, 19, 20, and 22, here are the calculations for the net forces:

### Question 13
**Vectors:**
- 0.55 m (up)
- 0.70 m (up)
- 0.95 m (down)
- 1.60 m (down)

**Calculation:**
- Upward forces: \(0.55 m + 0.70 m = 1.25 m\)
- Downward forces: \(0.95 m + 1.60 m = 2.55 m\)
- Net force = Upward forces - Downward forces
- Net force = \(1.25 m - 2.55 m = -1.30 m\) (indicating 1.30 m down)

**Answer:** 1.30 m down

### Question 19
**Vectors:**
- 2.8 m (right)
- 5.6 m (right)
- 4.2 m (right)
- 3.8 m (left)

**Calculation:**
- Rightward forces: \(2.8 m + 5.6 m + 4.2 m = 12.6 m\)
- Leftward forces: \(3.8 m\)
- Net force = Rightward forces - Leftward forces
- Net force = \(12.6 m - 3.8 m = 8.8 m\) (indicating the direction is right)

**Answer:** 8.8 m right

### Question 20
**Forces:**
- 15 N (up)
- 5 N (down)

**Calculation:**
- Net force = Upward forces - Downward forces
- Net force = \(15 N - 5 N = 10 N\) (indicating the direction is up)

**Answer:** 10 N up

### Question 22
**Forces:**
- 2 N (left)
- 25 N (right)
- 20 N (up)
- 20 N (down)

**Calculation:**
- Rightward forces = \(25 N\)
- Leftward forces = \(2 N\)
- Vertical forces: Upward = \(20 N\), Downward = \(20 N\) (They cancel each other out)
- Net force horizontally = \(25 N - 2 N = 23 N\) (indicating the direction is right)
- Net vertical force = \(20 N - 20 N = 0 N\)

**Answer:** 23 N right

If you have any other questions or need further assistance, feel free to ask!