The answer is "According to Newton's 3rd law, forces come in pairs. The wall crumbles because it wasn't strong enough to apply an equal amount of force back on the man pushing it."

Newton’s 1st Law: The law of inertia. Inertia is an objects tendency to resist changes in motion. An object at rest stays at rest until acted upon by an unbalanced force. The same is true of an object in motion. It will stay in motion until acted upon by an unbalanced force. Motion usually stops due to the forces gravity, or friction. In empty space, moving objects just keep going and going and going because there aren’t forces like air resistance or gravity to stop them!

Newton’s 2nd Law: Force = mass x acceleration. This law tells us that force is directly related to mass and acceleration. In other words, more massive objects require more force to accelerate the same distance as less massive ones. It will also require more force to increase the acceleration of an object. Lastly, we can solve for any of these variables if we are given two of them. Mass = force ÷ acceleration. Acceleration = force ÷ mass.

Newton’s 3rd Law: For every action there is an equal and opposite reaction. Forces come in pairs, so when we send a baseball flying with a force of 50 Newtons, there is also a 50 Newton force acting on the baseball bat in the opposite direction. This is even true when things are sitting still. Gravity pulls down on an object, while the normal force pushes up in the equal and opposite direction.

The answer is Newton's 3rd Law, because the skaters move away from each other with equal and opposite forces.

Newton’s 1st Law: The law of inertia. Inertia is an objects tendency to resist changes in motion. An object at rest stays at rest until acted upon by an unbalanced force. The same is true of an object in motion. It will stay in motion until acted upon by an unbalanced force. Motion usually stops due to the forces gravity, or friction. In empty space, moving objects just keep going and going and going because there aren’t forces like air resistance or gravity to stop them!

Newton’s 2nd Law: Force = mass x acceleration. This law tells us that force is directly related to mass and acceleration. In other words, more massive objects require more force to accelerate the same distance as less massive ones. It will also require more force to increase the acceleration of an object. Lastly, we can solve for any of these variables if we are given two of them. Mass = force ÷ acceleration. Acceleration = force ÷ mass.

Newton’s 3rd Law: For every action there is an equal and opposite reaction. Forces come in pairs, so when we send a baseball flying with a force of 50 Newtons, there is also a 50 Newton force acting on the baseball bat in the opposite direction. This is even true when things are sitting still. Gravity pulls down on an object, while the normal force pushes up in the equal and opposite direction.

The answer is "a fireman turns on a hose and is knocked backwards" because the force of the water going out of the hose is equal and opposite to the force pushing backwards on the fireman.

Newton’s 1st Law: The law of inertia. Inertia is an objects tendency to resist changes in motion. An object at rest stays at rest until acted upon by an unbalanced force. The same is true of an object in motion. It will stay in motion until acted upon by an unbalanced force. Motion usually stops due to the forces gravity, or friction. In empty space, moving objects just keep going and going and going because there aren’t forces like air resistance or gravity to stop them!

Newton’s 2nd Law: Force = mass x acceleration. This law tells us that force is directly related to mass and acceleration. In other words, more massive objects require more force to accelerate the same distance as less massive ones. It will also require more force to increase the acceleration of an object. Lastly, we can solve for any of these variables if we are given two of them. Mass = force ÷ acceleration. Acceleration = force ÷ mass.

Newton’s 3rd Law: For every action there is an equal and opposite reaction. Forces come in pairs, so when we send a baseball flying with a force of 50 Newtons, there is also a 50 Newton force acting on the baseball bat in the opposite direction. This is even true when things are sitting still. Gravity pulls down on an object, while the normal force pushes up in the equal and opposite direction.

This is an example of Newton's 1st law, because the crash dummies have a tendency to remain in motion until a force acts on them.

Newton’s 1st Law: The law of inertia. Inertia is an objects tendency to resist changes in motion. An object at rest stays at rest until acted upon by an unbalanced force. The same is true of an object in motion. It will stay in motion until acted upon by an unbalanced force. Motion usually stops due to the forces gravity, or friction. In empty space, moving objects just keep going and going and going because there aren’t forces like air resistance or gravity to stop them!

Newton’s 2nd Law: Force = mass x acceleration. This law tells us that force is directly related to mass and acceleration. In other words, more massive objects require more force to accelerate the same distance as less massive ones. It will also require more force to increase the acceleration of an object. Lastly, we can solve for any of these variables if we are given two of them. Mass = force ÷ acceleration. Acceleration = force ÷ mass.

Newton’s 3rd Law: For every action there is an equal and opposite reaction. Forces come in pairs, so when we send a baseball flying with a force of 50 Newtons, there is also a 50 Newton force acting on the baseball bat in the opposite direction. This is even true when things are sitting still. Gravity pulls down on an object, while the normal force pushes up in the equal and opposite direction.

The answer is: "sitting in a chair and the chair exerts the same amount of force as you when you sit on it" because this is an example of Newton's 3rd law.

Newton’s 1st Law: The law of inertia. Inertia is an objects tendency to resist changes in motion. An object at rest stays at rest until acted upon by an unbalanced force. The same is true of an object in motion. It will stay in motion until acted upon by an unbalanced force. Motion usually stops due to the forces gravity, or friction. In empty space, moving objects just keep going and going and going because there aren’t forces like air resistance or gravity to stop them!

Newton’s 2nd Law: Force = mass x acceleration. This law tells us that force is directly related to mass and acceleration. In other words, more massive objects require more force to accelerate the same distance as less massive ones. It will also require more force to increase the acceleration of an object. Lastly, we can solve for any of these variables if we are given two of them. Mass = force ÷ acceleration. Acceleration = force ÷ mass.

Newton’s 3rd Law: For every action there is an equal and opposite reaction. Forces come in pairs, so when we send a baseball flying with a force of 50 Newtons, there is also a 50 Newton force acting on the baseball bat in the opposite direction. This is even true when things are sitting still. Gravity pulls down on an object, while the normal force pushes up in the equal and opposite direction.

The answer is 100 Newtons of force because using Newton's 2nd law, we can multiply mass x acceleration to get the force.

Newton’s 1st Law: The law of inertia. Inertia is an objects tendency to resist changes in motion. An object at rest stays at rest until acted upon by an unbalanced force. The same is true of an object in motion. It will stay in motion until acted upon by an unbalanced force. Motion usually stops due to the forces gravity, or friction. In empty space, moving objects just keep going and going and going because there aren’t forces like air resistance or gravity to stop them!

Newton’s 2nd Law: Force = mass x acceleration. This law tells us that force is directly related to mass and acceleration. In other words, more massive objects require more force to accelerate the same distance as less massive ones. It will also require more force to increase the acceleration of an object. Lastly, we can solve for any of these variables if we are given two of them. Mass = force ÷ acceleration. Acceleration = force ÷ mass.

Newton’s 3rd Law: For every action there is an equal and opposite reaction. Forces come in pairs, so when we send a baseball flying with a force of 50 Newtons, there is also a 50 Newton force acting on the baseball bat in the opposite direction. This is even true when things are sitting still. Gravity pulls down on an object, while the normal force pushes up in the equal and opposite direction.

The answer is "all of these" because each of the answer choices applies one of newton's laws to make the object slide for longer.

Newton’s 1st Law: The law of inertia. Inertia is an objects tendency to resist changes in motion. An object at rest stays at rest until acted upon by an unbalanced force. The same is true of an object in motion. It will stay in motion until acted upon by an unbalanced force. Motion usually stops due to the forces gravity, or friction. In empty space, moving objects just keep going and going and going because there aren’t forces like air resistance or gravity to stop them!

Newton’s 2nd Law: Force = mass x acceleration. This law tells us that force is directly related to mass and acceleration. In other words, more massive objects require more force to accelerate the same distance as less massive ones. It will also require more force to increase the acceleration of an object. Lastly, we can solve for any of these variables if we are given two of them. Mass = force ÷ acceleration. Acceleration = force ÷ mass.

Newton’s 3rd Law: For every action there is an equal and opposite reaction. Forces come in pairs, so when we send a baseball flying with a force of 50 Newtons, there is also a 50 Newton force acting on the baseball bat in the opposite direction. This is even true when things are sitting still. Gravity pulls down on an object, while the normal force pushes up in the equal and opposite direction.

The answer is "10 Newtons" because according to Newton's second law, force = mass x acceleration.

Newton’s 1st Law: The law of inertia. Inertia is an objects tendency to resist changes in motion. An object at rest stays at rest until acted upon by an unbalanced force. The same is true of an object in motion. It will stay in motion until acted upon by an unbalanced force. Motion usually stops due to the forces gravity, or friction. In empty space, moving objects just keep going and going and going because there aren’t forces like air resistance or gravity to stop them!

Newton’s 2nd Law: Force = mass x acceleration. This law tells us that force is directly related to mass and acceleration. In other words, more massive objects require more force to accelerate the same distance as less massive ones. It will also require more force to increase the acceleration of an object. Lastly, we can solve for any of these variables if we are given two of them. Mass = force ÷ acceleration. Acceleration = force ÷ mass.

Newton’s 3rd Law: For every action there is an equal and opposite reaction. Forces come in pairs, so when we send a baseball flying with a force of 50 Newtons, there is also a 50 Newton force acting on the baseball bat in the opposite direction. This is even true when things are sitting still. Gravity pulls down on an object, while the normal force pushes up in the equal and opposite direction.

Newton’s 1st Law: The law of inertia. Inertia is an objects tendency to resist changes in motion. An object at rest stays at rest until acted upon by an unbalanced force. The same is true of an object in motion. It will stay in motion until acted upon by an unbalanced force. Motion usually stops due to the forces gravity, or friction. In empty space, moving objects just keep going and going and going because there aren’t forces like air resistance or gravity to stop them!

Newton’s 2nd Law: Force = mass x acceleration. This law tells us that force is directly related to mass and acceleration. In other words, more massive objects require more force to accelerate the same distance as less massive ones. It will also require more force to increase the acceleration of an object. Lastly, we can solve for any of these variables if we are given two of them. Mass = force ÷ acceleration. Acceleration = force ÷ mass.

Newton’s 3rd Law: For every action there is an equal and opposite reaction. Forces come in pairs, so when we send a baseball flying with a force of 50 Newtons, there is also a 50 Newton force acting on the baseball bat in the opposite direction. This is even true when things are sitting still. Gravity pulls down on an object, while the normal force pushes up in the equal and opposite direction.

The answer is Newton's 1st law because the friction of the grass is an unbalanced force which changes the motion of the ball.

Newton’s 1st Law: The law of inertia. Inertia is an objects tendency to resist changes in motion. An object at rest stays at rest until acted upon by an unbalanced force. The same is true of an object in motion. It will stay in motion until acted upon by an unbalanced force. Motion usually stops due to the forces gravity, or friction. In empty space, moving objects just keep going and going and going because there aren’t forces like air resistance or gravity to stop them!

Newton’s 2nd Law: Force = mass x acceleration. This law tells us that force is directly related to mass and acceleration. In other words, more massive objects require more force to accelerate the same distance as less massive ones. It will also require more force to increase the acceleration of an object. Lastly, we can solve for any of these variables if we are given two of them. Mass = force ÷ acceleration. Acceleration = force ÷ mass.

Newton’s 3rd Law: For every action there is an equal and opposite reaction. Forces come in pairs, so when we send a baseball flying with a force of 50 Newtons, there is also a 50 Newton force acting on the baseball bat in the opposite direction. This is even true when things are sitting still. Gravity pulls down on an object, while the normal force pushes up in the equal and opposite direction.