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Grade 8 Forces and Interactions Quiz

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Questions and Answers

Which of the following is an example of a contact force?

Gravity

Magnetism

Friction (correct)

Electromagnetic force

What happens to an object that has a net force of zero acting on it?

It moves with a constant velocity (correct)

It does not move at all

It moves with an increasing velocity

It moves with a decreasing velocity

Which of the following is an example of Newton's Third Law of Motion?

A skydiver falling from a plane

A tennis ball hitting a racket (correct)

A car accelerating on a straight road

A person walking on a sidewalk

An object in motion will remain in motion unless acted upon by an unbalanced force

True (A) Signup and view all the answers

Gravity is an example of a non-contact force

False (B) Signup and view all the answers

Friction is a force that always opposes motion

True (A) Signup and view all the answers

What is the difference between balanced and unbalanced forces?

Balanced forces are equal in size and opposite in direction and cancel each other out, resulting in no change in motion. Unbalanced forces are unequal in size and cause a change in motion. Signup and view all the answers

What is the relationship between mass and inertia?

Mass is the measure of an object's inertia. The greater the mass, the greater the object's resistance to changes in motion. Signup and view all the answers

What is the difference between static and kinetic friction?

Static friction is the force that opposes the start of motion between two surfaces that are in contact and at rest relative to each other. Kinetic friction is the force that opposes the motion of two surfaces that are in contact and are sliding relative to each other. Signup and view all the answers

Motion and Stability: Forces and Interactions, grade 8 ______

curriculum Signup and view all the answers

The study of forces and motion is important in understanding the behavior of ______

objects Signup and view all the answers

Newton's second law of motion states that force is equal to mass times ______

acceleration Signup and view all the answers

Study Notes

Types of Forces

An example of a contact force is friction.
Gravity is an example of a non-contact force.

Newton's Laws of Motion

An object in motion will remain in motion unless acted upon by an unbalanced force.
Newton's second law of motion states that force is equal to mass times acceleration.
Newton's Third Law of Motion states that every action has an equal and opposite reaction.

Forces and Motion

When an object has a net force of zero acting on it, it will remain stationary or maintain its motion.
Balanced forces are when the sum of forces acting on an object is zero, resulting in no change in motion.
Unbalanced forces are when the sum of forces acting on an object is not zero, resulting in a change in motion.

Friction

Friction is a force that always opposes motion.
There are two types of friction: static and kinetic friction.
Static friction occurs when an object is stationary, while kinetic friction occurs when an object is moving.

Mass and Inertia

The relationship between mass and inertia is that objects with more mass have more inertia.
Inertia is the tendency of an object to resist changes in its motion.

Importance of Studying Forces and Motion

The study of forces and motion is important in understanding the behavior of objects and their interactions.

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Description

Test your knowledge of Motion and Stability with this grade 8 level quiz on Forces and Interactions. Challenge yourself with questions like, "Which of the following is an example of a contact force?" and "What happens to an object that has a net force of zero acting on it?" Explore Newton's Third Law of Motion with questions like "Which of the following is an example of Newton's Third Law of Motion?" Put your understanding to the test and improve your science skills with this quiz.