Podcast
Questions and Answers
A force of 20 N is applied to an object, but it does not move. How much work has been done?
A force of 20 N is applied to an object, but it does not move. How much work has been done?
- 20 Joules
- 200 Joules
- It cannot be determined
- 0 Joules (correct)
Which scenario accurately describes work being done in a scientific context?
Which scenario accurately describes work being done in a scientific context?
- A weightlifter strains to lift a barbell but cannot move it.
- A student holds a heavy book while standing still.
- A crane lifts a steel beam to the top of a building. (correct)
- A car travels at a constant speed on a flat road.
What best describes the relationship between force and displacement in the calculation of work?
What best describes the relationship between force and displacement in the calculation of work?
- Work is the difference between force and displacement.
- Work is the product of force and displacement. (correct)
- Work is the sum of force and displacement.
- Work is the quotient of force and displacement.
Which quantity is equivalent to a Newton-meter (Nm)?
Which quantity is equivalent to a Newton-meter (Nm)?
If two objects experience the same force, but object A moves twice the distance as object B, what can be said about the work done?
If two objects experience the same force, but object A moves twice the distance as object B, what can be said about the work done?
Which of the following is an example of a compound machine?
Which of the following is an example of a compound machine?
Which of the following actions would not be considered 'work' in the scientific sense?
Which of the following actions would not be considered 'work' in the scientific sense?
What happens to the amount of work done if the distance an object moves is halved, while the force applied remains the same?
What happens to the amount of work done if the distance an object moves is halved, while the force applied remains the same?
Which situation involves calculating work done against gravity?
Which situation involves calculating work done against gravity?
What is the primary distinction between simple and compound machines?
What is the primary distinction between simple and compound machines?
Flashcards
Work (in science)
Work (in science)
Work is done only when a force applied to an object moves it in the direction of the force.
Calculating Work
Calculating Work
Force multiplied by displacement (W = F x d). Measured in Newton-meters or Joules.
Force
Force
Anything that causes motion or a change in motion.
Displacement
Displacement
Signup and view all the flashcards
Machine
Machine
Signup and view all the flashcards
Simple Machines
Simple Machines
Signup and view all the flashcards
Compound Machines
Compound Machines
Signup and view all the flashcards
Study Notes
- College entrance exam and science high school entrance test tips for UPCAT, ACET, USTET, DLSUCET, PSHS-NCE, and other entrance tests
Work
- In science, work occurs only when a force applied to an object moves the object in the direction of the force
- Work is represented as force multiplied by displacement
- Force is anything that causes motion or a change in motion
- Displacement is the distance and direction by which an object is moved
Calculating the Amount of Work
-
Work (W) is calculated as Force (F) multiplied by distance (d).
-
Units are: Newton multiplied by meter
-
Equivalent to Newton-meter or Joule
-
Sample problem:
- To calculate the work done when pushing a sack of rice with a force of 50 N across a distance of 10 meters
- Given: Force (F) = 50 N, Distance (D) = 10 m
- Solution: W = F x d = 50 N x 10 m = 500 Nm or 500 J
- Note that 100 g is equivalent to 1 N
Machines
- Machines are mechanical devices that helps to do work or makes it easier
- Simple machines have only one or two parts
- Compound Machines are defined as machines using of one or more simple machines
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
