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Newtons Laws of Motion
The three laws proposed by Sir Isaac Newton to define the concept of a force and describe motion, used as the basis of classical mechanics.
1,508 Questions
The force the mover needs to apply to keep the box moving to the right at 1 m/s is 20 N to overcome the friction force acting to the left on the box. So, the total force applied by the mover in the right direction should be greater than 20 N to maintain the constant velocity of 1 m/s.
What way is the net force acting on a ball thrown in the air with upward velocity?
The net force acting on a ball thrown in the air with upward velocity is the force of gravity acting downwards. Gravity causes the ball to accelerate towards the ground. At the highest point of its trajectory, the net force is zero since the upward velocity is momentarily halted before the ball begins to fall back down.
What force acts as the centripetal force for a plane?
In a plane, the centripetal force required to maintain a circular path is provided by the lift force generated by the wings. As the plane turns, the wings generate a component of lift that acts towards the center of the circle, providing the necessary centripetal force.
What are some examples of newtons second law in space?
In space, Newton's second law can be observed in how a spacecraft accelerates or changes direction when thrusters are fired. The law explains that the acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass. This means that to accelerate a spacecraft in space, a force needs to be applied, considering the spacecraft's mass.
Why is it easier to successfully tackle a 70 kg man than a sumo wrestler?
Providing velocity is constant (say they are both running at 0.5ms-1).
The concept of momentum applies in this problem. The sumo wrestler (assume 165kg) will have more momentum despite moving at the same speed.
Momentum is given as the formula p = mv
Where p is momentum, m is mass and v is velocity.
The momentum of the sumo wrestler is 160 x 0.5 = 80kgms-1
The 70kg man has a momentum of:
70 x 0.5 = 35kgms-1
As you can see, the sumo wrestler has a momentum of 80kgms-1 as opposed to the man with a momentum of 35kgms-1.
The person with the more momentum is therefore harder to tackle and more difficult to bring to a stop.
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.
Why action and reaction forces of newton 3 law not cancel each other give reason?
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.
What is the measure of an objects laziness?
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.
What are two nonmoving objects that are useful reference points?
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.
Did isaac newton develop three rules about forces we still use today?
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.
What happens to a system when there are no external 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.
What happens when no force acts on an object?
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.
When is total mechanical energy conserved?
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.
Do centripetal and centrifugal reaction constitute action-reaction pair?
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.
When finding net force why must you kow the directions of the forces acting on an object?
If you want to know the result of two people pushing a car with equal forces, it's
going to help you to know whether they're both pushing in the same direction or
in opposite directions. And if you need them to move the car, I'm sure you'll know
which method you want them to use, and which method you don't want them to use.
=20N*15m
=300J
When moving horizontal no work has been done against gravity( or weight of the book)
Can you give me a good example of each of newton's laws plus inertia and conservation of momentum?
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.
Does Newton's First Law apply to rotating objects?
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.
What equation states newtons 2nd law of motion?
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.
What forces have to be balanced for terminal velocity to be reached by an object?
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.
Which of newton's laws explain how a walking person moves forward by pushing backward?
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.
Which of Newtons laws is not a law of motion?
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.
