Newtons Laws of Motion

The direction of the force of kinetic friction is opposite to the direction of an object's motion. This is due to the fact that kinetic friction acts to oppose the relative motion between the object and the surface it is moving on. As the object moves forward, the kinetic friction force acts in the opposite direction in an effort to slow down or stop the object.

Yes, that is correct. The law of inertia, also known as Newton's First Law of Motion, states that an object will remain at rest or continue moving at a constant velocity in a straight line unless acted upon by an external force.

The action and reaction forces do cancel each other out, so that there is a net force of zero. When you push on a wall, the wall does not move because the action force that you exert and the reaction force that the wall exerts are equal but opposite and the net force is zero.

When the upward force of air resistance becomes equal to the downward force of gravity, the ball will reach its terminal velocity and stop accelerating. The net force acting on the ball will be zero, and it will continue to fall at a constant speed.

The measure of an object's laziness is subjective and can vary based on individual perceptions. However, common indicators of laziness in an object may include lack of efficiency, delays in completing tasks, or overall sluggish performance compared to expected standards.

Two nonmoving objects that are useful reference points are a stationary pole or a fixed building. These objects can serve as points of comparison or markers to determine direction, distance, or positioning.

Yes, Isaac Newton formulated three laws of motion that are still widely used today. These laws describe the relationship between the motion of an object and the forces acting on it.

If there are no external forces acting on a system, it will remain in its current state of motion or rest. This is described by Newton's first law of motion, which states that an object will continue in its state of rest or uniform motion in a straight line unless acted upon by an external force.

If no force acts on an object, it will remain at rest if it was initially at rest, or continue moving at a constant velocity if it was already in motion. This is known as Newton's first law of motion, which states that an object will remain in its state of motion unless acted upon by an external force.

Total mechanical energy is conserved in a system when no external forces, such as friction or air resistance, are acting on the system. This often occurs in idealized situations like when an object is in free fall or when no energy is lost due to non-conservative forces.

That is Newton's First Law of Motion, or Newton's Law of Inertia. What it means that once an object is moving, its inertia will keep it moving until another force stops it. Also, an object at rest will stay at rest, until a force overcomes its inertia.

No, centripetal and centrifugal reactions do not constitute an action-reaction pair. Centripetal force acts towards the center of rotation to keep an object moving in a circular path, while centrifugal force is a pseudo-force that appears to act outward on the object in the rotating frame of reference. These forces do not follow Newton's third law of motion as an action-reaction pair.

=20N*15m

=300J

When moving horizontal no work has been done against gravity( or weight of the book)

well, i can explain the law of inertia. Think of the I turned sideways as a seat belt, because the law is about the safety of wearing a seat belt. If you are in your car going 70 miles on highway and you stop, if you don't have your seat belt on then you are going to fly up.

Yes, Newton's First Law applies to rotating objects as well. An object in rotational motion will continue rotating at a constant speed and direction unless acted upon by an external torque (force). This is analogous to Newton's First Law for linear motion, which states that an object in motion will remain in motion unless acted upon by an external force.

The equation that states Newton's second law of motion is F = ma, where F is the net force acting on an object, m is the mass of the object, and a is the acceleration of the object. This law describes how an object will accelerate in response to the forces acting upon it.

For an object in freefall, terminal velocity is reached when the drag force becomes equal and opposite to the force of gravity. This creates a net force of 0, resulting in no further acceleration.

Newton's third law of motion states that for every action, there is an equal and opposite reaction. When a person pushes backward against the ground while walking, the ground exerts an equal and opposite force forward on the person, propelling them forward.

Newton's law of universal gravitation is not a law of motion. This law describes the force of gravity between two objects based on their masses and the distance between them, rather than the motion of objects themselves.

I assume you mean micro gravity or in free fall when you write "space" You (the jumper) has to push on something.

Once you have jumped off something you will continue (as Newtons laws of motion propose) until you are stopped by another force.

If the vertical speed is constant, that means there is zero vertical acceleration.

If the vertical acceleration is zero, that means the net vertical force on the object

is zero. If the net vertical force on the object is zero, that means the downward

force (weight) and upward force (air resistance) are equal.

Surfers experience both kinetic and static friction while surfing. Kinetic friction occurs between the water and the surfboard as it moves across the surface of the water. Static friction is experienced when the surfer paddles to catch a wave or when they stand up on the board to balance.

Projectile motion refers to the motion of an object moving through a gravitational field, such as a ball thrown in the air. The Magnus effect, on the other hand, is a phenomenon where a spinning object experiences a sideways force perpendicular to its direction of motion, affecting its trajectory. In essence, projectile motion is a general term for the motion of objects in a gravitational field, while the Magnus effect is a specific effect caused by rotation.