Podcast
Questions and Answers
Which of the following scenarios best illustrates a non-contact force?
Which of the following scenarios best illustrates a non-contact force?
- An apple falling from a tree. (correct)
- A hand pushing a grocery cart.
- A car being slowed down by its brakes.
- A rope pulling a box across the floor.
According to the law of universal gravitation, how would increasing the distance between two objects affect the gravitational force between them?
According to the law of universal gravitation, how would increasing the distance between two objects affect the gravitational force between them?
- It would not affect the gravitational force.
- It would double the gravitational force.
- It would decrease the gravitational force. (correct)
- It would increase the gravitational force.
A book is resting on a table. Which type of friction primarily prevents the book from sliding off if the table is slightly tilted?
A book is resting on a table. Which type of friction primarily prevents the book from sliding off if the table is slightly tilted?
- Static friction (correct)
- Sliding friction
- Fluid friction
- Rolling friction
A skater is gliding on ice. Which type of friction is primarily at play?
A skater is gliding on ice. Which type of friction is primarily at play?
A submarine is moving underwater. Which type of friction is primarily affecting its motion?
A submarine is moving underwater. Which type of friction is primarily affecting its motion?
An object with a mass of 10 kg is experiencing a gravitational force of 98 N. If the mass is doubled, what happens to the gravitational force, assuming all other variables remain constant?
An object with a mass of 10 kg is experiencing a gravitational force of 98 N. If the mass is doubled, what happens to the gravitational force, assuming all other variables remain constant?
If an astronaut has a mass of 60 kg on Earth, how would their mass change if they were on the Moon?
If an astronaut has a mass of 60 kg on Earth, how would their mass change if they were on the Moon?
An astronaut weighs 882N on Earth (where gravitational acceleration is 9.8 m/s²). What would happen to the astronaut's weight on the moon, where the gravitational acceleration is approximately 1/6th of that on Earth?
An astronaut weighs 882N on Earth (where gravitational acceleration is 9.8 m/s²). What would happen to the astronaut's weight on the moon, where the gravitational acceleration is approximately 1/6th of that on Earth?
A box is being pushed across a floor with a force of 150N. If the force of sliding friction is 50N, what is the net force acting on the box?
A box is being pushed across a floor with a force of 150N. If the force of sliding friction is 50N, what is the net force acting on the box?
Which of the following is an example of converting sliding friction to static friction?
Which of the following is an example of converting sliding friction to static friction?
Flashcards
Force
Force
A push or pull on an object.
Contact Force
Contact Force
A force requiring direct contact between objects.
Non-contact Force
Non-contact Force
A force that acts between objects without direct physical contact.
Friction
Friction
Signup and view all the flashcards
Static Friction
Static Friction
Signup and view all the flashcards
Sliding Friction
Sliding Friction
Signup and view all the flashcards
Fluid Friction
Fluid Friction
Signup and view all the flashcards
Gravity
Gravity
Signup and view all the flashcards
Mass
Mass
Signup and view all the flashcards
Weight
Weight
Signup and view all the flashcards
Study Notes
Forces
- Forces are explored in Chapter 2 (Gravity & Friction), Chapter 19 (Electric Forces), and Chapter 20 (Magnetic Forces)
- Electric and Magnetic forces are covered in Stemscopes
- Gravitational Forces are covered in Stemscopes
- Forces change the motion of an object
Gravity and Friction
- Contact forces and non-contact forces are two types of forces
- The law of universal gravitation exists
- Friction affects the motion of two objects sliding past each other
Types of Forces
- A force is a push or pull on an object
- There are two types of forces: contact and non-contact
Contact Force
- Defined as a push or pull on one object by another that is touching it
- Examples include pushing a container, pressing on computer keys, and friction
Noncontact Force
- Defined as a push or pull on one object by another without touching it
- Examples include gravity, magnetic force, and electrical force
Types of Friction
- Friction is a force that resists the motion of two objects that are touching
- Static friction prevents objects from sliding past each other
- Sliding friction opposes the motion of objects sliding past each other
- Fluid friction occurs between a surface and a fluid such as water or air (air resistance)
Static Friction vs. Sliding Friction
- Static friction has a net force of 0N
- Sliding friction has a net force of 130N
Gravity
- An attractive force that exists between all objects that have mass
- Mass is the amount of matter in an object
- The more the mass, the more the gravitational pull
- The greater the distance, the less the gravitational pull
Weight vs. Mass
- Weight is the amount of gravitational force exerted on an object and is measured in newtons
- If an astronaut weighs 539N and has a mass of 55kg on Earth, their weight would be less if they were on the moon, but their mass would not change
Non-contact Force: Electrical
- Static Charge: unbalanced negative or positive charge on an object
- Opposite charges attract each other
- The same charges repel each other
- The more charge, the greater the electrical force (attraction or repulsion)
- The more distance, the less electrical force
Non-contact Force: Magnetic
- Magnet: object that attracts metal iron
- Magnetic Pole: place on a magnet where the force it applies is the strongest
- Opposite poles (charges) attract each other
- The same poles (charges) repel each other
- Size of magnet is a variable affecting magnetic strength
- Distance: the further away two magnets are the weaker the magnetic force.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
Related Documents
Description
Explore forces including gravity, friction, electric, and Magnetic forces. Contact forces involve objects touching, while non-contact forces like gravity act at a distance. Friction opposes motion between surfaces.
