Newtons Laws of Motion

The law of motion, particularly Newton's first law of motion, states that an object in motion will continue in motion unless acted upon by an external force. This has implications for safety and protection in that it emphasizes the need for seat belts, airbags, helmets, and other protective gear to prevent injury during sudden stops or impacts. Understanding this law can also help design safer vehicles and structures to better withstand external forces.

Yes, it is possible for a body to have zero velocity while experiencing non-zero acceleration. This occurs when the body is changing direction but not speed, such as in circular motion. Another example is when the body is momentarily at rest at the peak of its motion, like a ball thrown upwards.

That is difficult to answer in that a horizontal force may be perpendicular to the body. So, the question does not differentiate between "can a vertical force cancel a horizontal force?" and "can a horizontal force cancel a horizontal force?" The best answer is, yes: two opposite and equal horizontal forces, both perpendicular to a body, will cancel each other.

Frictional force depends on the nature of the surfaces in contact and can vary based on surface roughness, temperature, and the presence of lubricants. It does not depend on the surface area in contact but relies on the normal force acting between the surfaces. Frictional force can also generate heat and wear on the surfaces in contact, leading to energy loss and decreased efficiency in mechanical systems.

Yes, it is possible for the average velocity of an object to be zero during a given interval even if its average velocity for the first half of the interval is not zero. This can occur when the object moves in opposite directions such that the distances traveled cancel out over the entire interval. For example, if an object moves 3 meters to the right and then 3 meters to the left in equal times, its average velocity for the entire interval would be zero.

If we take this simply, we can manage it. Let's take it one law at a time. First, inertia. Bodies at rest tend to remain at rest and bodies in motion tend to remain in motion. And both of those are in effect unless the body is acted upon by an outside force. For the glider, it is going to need to have some force applied for it to start flying (gliding). It will also be subject to some pretty complex forces when flying. Gravity is pulling down, and aerodynamics is supplying lift and the shape of the thing will engender drag (or "friction moving through the air" if you like). When air moves in a nonuniform way around the glider or when the control surfaces are used, things happen. There is a lot of stuff going on that has to do with inertia in a flying glider. It's inertial moment changes every microsecond (or less) as it is flying and interacting with the air. The second law of motion, that a change in motion is proportional to the force acting on a body, is tied to the first one. It takes a certain amount of force to get the mass of the glider moving to make it start to fly (or glide). The amount of force is proportional to the mass of the glider, and the more massive the glider, the more force is required to get it going. Same with changes in flight. The more massive the glider, the more force the control surfaces will have to effect to change the course of the thing. And smaller irregularities in air flow will have little affect on a more massive glider while they will affect a small, light glider more noticeably. Lastly, for every action there is an equal and opposite reaction. When a glider is in flight, any movement of the glider will move some volume of air in a given direction with a given amount of force to cause the glider to stay aloft or to change direction. When the glider pushes on air to maneuver, the air will "push back" on the glider and/or its control surfaces. Certainly it is pushing up on the underside of the wing to give the glider lift, and the air is being pushed down with equal force. Newton's laws of motion can be reviewed by using the link to the article on them posted by our friends at Wikipedia, where knowledge is free.

let a Body moving with initial velocity 'u' changes its velocity to 'v' in time 't'

then ,

acceleration 'a' = (v-u)/t

=> a * t = v - u

=> a * t + u = v

=> v = u + a * t

Well, I can't give you any pictures but I can give you a simple definition that is very easy to understand.

Newton's Laws of Motion

Law 1- (often referred to as the law of inertia) An object at rest will tend to stay at rest and an object in motion will continue to move at the same velocity (speed in a certain direction) until acted upon by an unbalanced force.

Hope this helped.

Friction originates from the fact that everything is rough at a small enough scale. When these rough parts grind against each other, something must move out of the way, since every force results in motion. When something does give, part of the force is used, and since the scale is so small, heat is created as individual molecules move.

The work done by the coolie is zero because the force he exerts is in the vertical direction (lifting the load against gravity) while the displacement is in the horizontal direction. Work is only done when the force and displacement are in the same direction.

No, dropping two objects of different mass from the same height doesn't contradict Newton's 2nd Law. The law states that the acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass, so objects of different mass will experience different accelerations due to gravity even when dropped from the same height.

m/s^2 ? , strictly speaking this should be (m/s)/s , meaning velocity change per second, so if you go from 0 to 10 m/s in 2 seconds , your acceleration is

10/2 = 5 (m/s)/s

maybe m/s^2 is easier to type ?

To recap, Newton's first law states that an object in motion will stay in motion with constant velocity given that there are no net forces acting upon it. For example, if a ball was pushed with zero net forces acting on it besides the first force push, it will go on forever until a force decides to act on it, such as friction or gravity. Contrary to Newton's first law, Newton's second law implies that if an object is acted upon with existing net force, the object will accelerate with the same direction.

The equation Force (F) = mass (m) x acceleration (a) derives from the second law. Similarly to the first law, any net force on a body is conserved, implying the rule of conservation of momentum. In the first law, a force acted on a body will cause the body to move with the same magnitude of force in the same direction if there is zero net force. In the second law, a net force on a body causes the body to accelerate with the same direction as the net force.

If the raindrop is falling at a constant speed, then it has reached terminal velocity. This happens when the downward force (due to gravity) is the same as the upward force due to friction. As such the net force acting on the rain drop is 0.

Yes, it is possible for a nonzero net force to act on an object without changing its speed. This can happen if the force is acting perpendicular to the direction of motion, resulting in a change in direction but not speed (as in circular motion).

Rugby players in motion tend to stay in motion unless acted upon by an external force—a concept known as Newton's First Law of Motion. When a player is running and suddenly stops or changes direction, they experience the impact of an external force that affects their motion. Similarly, when a rugby player tackles another player, they apply a force to alter the opponent's motion according to Newton's First Law.

The net force on the car can be calculated using Newton's second law, F = m * a, where F is the net force, m is the mass of the car (1200 kg), and a is the acceleration (20 m/s^2). Therefore, the net force on the car would be 24,000 N.

Yes, Newton's first law can be deduced from his second law. Newton's first law states that an object in motion stays in motion, and an object at rest stays at rest, unless acted upon by an external force. When applying the second law (F=ma) to an object with no external forces acting on it (F=0), we find that the acceleration (a) is zero, which means the object continues in its current state of motion, as described by the first law.

Strictly speaking, you would say that a force acts on a system and the impulse of that force corresponds to the change in momentum of the system due to the action of the force. More mathematically, the impulse of a force is defined as the integral of that force with respect to time over the time period that the force acts.

The unit of measurement commonly used for calculating ship total resistance is Newtons (N). Total resistance is the sum of different types of resistance a ship faces while in motion, such as wave-making resistance, viscous resistance, and appendage resistance.

A large truck typically has more inertia than a small car because inertia is directly proportional to an object's mass. The greater mass of the truck means it will resist changes in its state of motion more than the smaller car.

A catapult demonstrates Newton's second law of motion by showing how the acceleration of the projectile (object being launched) is directly proportional to the force applied by the tension in the catapult's arm (F=ma). This means that the larger the force applied to the arm, the greater the acceleration of the projectile, leading to a more powerful launch.

If there is no air resistance moving the 2000-kg box would cost virtually no effort since the slightest shove would set it into motion which it would continue indefinably.

Pushing the 1-kg box would require a constant investment of effort because you need to combat the force of friction.

Thus, pushing the 1-kg box around is more tiresome.