Podcast
Questions and Answers
A box rests on an inclined plane. At what angle will static friction be overcome, causing the box to slide?
A box rests on an inclined plane. At what angle will static friction be overcome, causing the box to slide?
- When the angle of the inclined plane is equal to the coefficient of static friction.
- When the box's weight is completely supported by the inclined plane.
- When the normal force equals the weight of the box.
- When the component of gravity parallel to the plane exceeds the maximum static friction force. (correct)
What would happen to the gravitational force between two objects if the distance between them is doubled and both masses are halved?
What would happen to the gravitational force between two objects if the distance between them is doubled and both masses are halved?
- The gravitational force increases by a factor of 4.
- The gravitational force remains the same.
- The gravitational force decreases by a factor of 16. (correct)
- The gravitational force decreases by a factor of 8.
A student is measuring the force of sliding friction between a wooden block and a table. Which action would likely increase the force of friction?
A student is measuring the force of sliding friction between a wooden block and a table. Which action would likely increase the force of friction?
- Decreasing the weight of the wooden block.
- Reducing the surface area of the block in contact with the table.
- Placing sandpaper between the block and the table. (correct)
- Applying a lubricant between the block and the table.
Considering the concept of non-contact forces, which of the following scenarios best illustrates the effect of an electrical force?
Considering the concept of non-contact forces, which of the following scenarios best illustrates the effect of an electrical force?
An object is at rest on a table. Which of the following statements best describes the forces acting on the object?
An object is at rest on a table. Which of the following statements best describes the forces acting on the object?
A car is traveling at a constant velocity on a straight, level road. What can be said about the forces acting on the car?
A car is traveling at a constant velocity on a straight, level road. What can be said about the forces acting on the car?
An object is launched into the air. Disregarding air resistance, what force(s) act on the object during its flight?
An object is launched into the air. Disregarding air resistance, what force(s) act on the object during its flight?
A student rubs a balloon on their hair, and the balloon becomes negatively charged. The balloon then sticks to a wall. What force is primarily responsible for the balloon sticking to the wall?
A student rubs a balloon on their hair, and the balloon becomes negatively charged. The balloon then sticks to a wall. What force is primarily responsible for the balloon sticking to the wall?
Flashcards
Force
Force
A push or pull on an object, measured in Newtons (N).
Contact Force
Contact Force
A force that requires direct contact between objects.
Non-Contact Force
Non-Contact Force
A force that acts between objects without 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
Study Notes
- Forces can change the motion of an object.
Gravity and Friction
- Contact forces and Non-contact forces are different 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 defined as a push or a pull on an object.
- Forces are measured in newtons (N).
Contact force
- A contact force is a push or pull on one object by another that is touching it.
- Pushing a container, pressing on computer keys, and friction are examples of contact forces.
Non-Contact Force
- A non-contact force is a push or pull on one object by another without touching it.
- Gravity, magnetic force, and electrical force are examples of non-contact forces.
Types of Friction
- Friction is a force that resists the motion of two objects that are touching.
Static Friction
- Static friction prevents objects from sliding past each other.
Sliding Friction
- Sliding friction opposes the motion of objects sliding past each other.
Fluid Friction
- Fluid friction is friction between a surface and a fluid such as water or air, like air resistance.
Static Friction vs. Sliding Friction Example
- Static friction is illustrated by a scenario where an applied force of 100N is met with -100N of static friction resulting in zero net force.
The Effects of Mass and Distance on Gravity
- Gravity refers to an attractive force between objects that possess mass.
- Mass is the amount of matter an object has.
- The greater the mass, the greater the gravitational pull between objects.
- The greater the distance, the weaker the gravitational pull.
Weight vs. Mass
- An astronaut weighs 539N and has a mass of 55kg on Earth, so her weight would be less on the moon.
Static Charge
- Static charge is an imbalance of positive or negative charge on an object.
- Opposite charges attract each other.
- The same charges repel each other.
Variables Affecting Electric Charge
- The amount of charge: the greater the charge, the greater the electric force (attraction or repulsion).
- Distance: the greater the distance, the less electrical force.
Magnet
- A magnet is an object that attracts metal like iron.
- A magnetic pole is the location on a magnet where the force is strongest.
- Opposite poles (charges) attract each other.
- The same poles (charges) repel each other.
Variables Affecting Magnetic Strength
- Size of magnet affects magnetic strength.
- Distance: the further away the 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 how forces alter an object's motion, distinguishing between contact and non-contact forces such as gravity and friction. Learn about the law of universal gravitation and the different types of friction that resist motion between objects. Grasp the concept of force measured in newtons.
