0
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
How do you calculate distance when given velocity and weight?
To calculate distance with velocity and weight, you can use the equation for work: Work = Force x Distance. The force can be calculated by multiplying the weight with gravity. Velocity can then be used to determine the time it takes for the object to travel that distance using the equation Distance = Velocity x Time.
The first law of motion, also known as the law of inertia, states that an object at rest will stay at rest, and an object in motion will stay in motion at a constant velocity unless acted upon by an external force. In the case of an ice skater sliding across the ice at a constant velocity, the skater will continue moving at that constant velocity unless a force (like friction or wind resistance) acts to change their motion.
How do headrests help to guard against this type of injury?
Headrests help guard against neck injuries by providing support to the head and upper body during an impact, reducing the risk of whiplash. The headrest acts as a barrier that restrains the head's backward movement and helps maintain proper alignment with the spine, preventing excessive strain on the neck muscles and ligaments.
What is a force in Newton's second law of motion?
In Newton's second law of motion, force is defined as the product of an object's mass and acceleration. It is represented by the formula F = ma, where F is the force, m is the mass of the object, and a is the acceleration. This law describes how the acceleration of an object is directly proportional to the net force acting on it.
Objects at rest will not accelerate unless a force acts on them. This concept is similar to Newton's First Law of Motion, which states that an object will remain at rest or in uniform motion unless acted upon by an external force. Both ideas emphasize the need for a force to cause a change in an object's motion.
Can the sum of the torques on an object be zero while the net force on the object is nonzero?
Yes. Consider an object with no torques acting on it (therefore the sum of the torques is obviously zero) but with a force directed through its center of mass.
How about a freely spinning wheel on a shaft? Would have to be in a vacuum.
Ok wait, the answer is yes. Consider a horizontal beam attached at one end that is 6 ft long. If a force (x) is applied at the end of it in the downward direction and another force is applied that is twice as powerful (2x) in the upward direction 3 ft from the attached end the net torque is zero but the net force is x in the upward direction.
F= M*g*Us
or
(Force needed) = (Mass of object) * (Gravitational field strength)* (Coefficient of Static Friction)
F (N)= .2 (kg) * 9.8 (m/s^2) * .4 (no units)
Solve it yourself
When an object is travelling on the rough surface frictional force is equal to ma?
When an object is moving on a rough surface, the frictional force acting on it is given by the equation F=μN, where μ is the coefficient of friction and N is the normal force. In this case, the frictional force is proportional to the mass of the object (m) and the acceleration (a) it experiences, so F=ma can be used to calculate the frictional force.
Why is an object in equilibrium during constant motion?
When an object is in equilibrium, the acceleration is zero. When the acceleration is zero, the velocity does not change; the non changing velocity includes the case when the velocity has value zero.
How does the first law apply to tennis?
The first law of Newton, also known as the law of inertia, applies to tennis in that an object at rest (such as a tennis ball) will stay at rest until acted upon by an external force (such as being hit by a racket). Similarly, once the ball is in motion, it will continue moving in a straight line unless another force acts upon it, like the net or the ground.
First of all, "cm cubed" is a volume, not an area. "cm squared" is an area.
On earth, the downward force (weight) exerted by a 5-kg mass is 49 newtons (11.02 pounds).
pressure = (force) / (area) = 49 newtons per cm2 = 490 kilopascal.
Also 71.1 PSI. (rounded)
To find the acceleration, use the formula F = ma, where F is the net force, m is the mass of the box, and a is the acceleration. Rearranging the formula to solve for acceleration gives a = F/m. Plugging in the values, a = 8.5 N / 24.3 kg = 0.35 m/s^2.
How do you find acceleration with mass and force?
You can find acceleration by dividing the force applied to an object by the mass of the object. The equation is: acceleration = force / mass. This relationship is described by Newton's second law of motion.
How is weight related to gravitational force?
Weight = Mass * Acceleration of gravity.
Weight = force of gravity on particular object.
Weight = force of gravity on an object;
Gravity = attracts all objects toward each other
When a force is applied that moves an object in the direction of the applied force is gravity done?
Gravity is indeed a force, but only one out of many.
magnetic, frictional, mechanical ... .
When an ordinary force applied to an object, (me pushing my wheelbarrow) this would not be considered as being affected by gravity.
What happens to the motion of an object if the net force acting on it is 0 n?
If the net force acting on an object is 0 N, the object will continue to move at a constant velocity in a straight line according to Newton's First Law of Motion.
Scale already reads 70 kg when elevator is at rest. This is Gravity Force down (Fg), plus Normal force (n) up. Now, force on the man in the upward direction from accelerating up (force E) = mass of the man x acc. of the lift in the upward direction = 70 x5.5 N = 385 N. Now force of gravity (Fg) = 70 x 9.8 N = 686 N. Plus the normal force (n) -which keeps him falling through floor of elevator - is also acting on him = 686 N (same as gravity in up direction).
So, F(y) = Elevator (Up) 385 (up) + Normal (up) 686 N - Gravity (down) 686 N. Therefore net force in the upward direction (against bottom of scale-floor) = (+385 + 686 - 686) N = 385 N. Hence the reading of the scale has extra = (385N). Scale is calibrated for "g = 9.8 m/ss". So, (385 / 9.8m/ss) kg = 39.3 kg extra. So, 39.3 kg (extra) + 70 kg (original) = 109.3 kg. This is why you feel heavier when elevator goes up.
Static friction does not apply when the block is already moving. Without friction, the force on the block parallel to the surface of the incline is Fg*sin(angle), so the acceleration without friction is 9.8* sin(30) = 9.8 * (1/2) = 4.9
Since it is accelerating at 3.2, friction is slowing down the block by (4.9-3.2 = 1.7). The coefficient of kinetic friction is (1.7/4.9) = 0.346939
What is it that its units are newtons per meters?
The units newtons per meter refer to the quantity known as a spring constant, which represents the stiffness of a spring. It describes how much force is needed to stretch or compress the spring by a certain distance.
Will knots help in the absence of friction?
No, knots rely on friction to hold them in place, so without friction, knots wouldn't be effective in securing items.
What force must be overcome to remove an electron?
The force that must be overcome to remove an electron from an atom is the electrostatic attraction between the electron and the positively charged nucleus. This force is governed by Coulomb's law and is known as the ionization energy. The amount of energy required to remove an electron depends on the specific atom and its electron configuration.
The force needed to slide the wooden block can be calculated using the formula: force = friction coefficient * mass * gravity. Given that the mass is 300 slugs and the friction coefficient is 0.80, the force required will be 2400 lbs.
Why is the idea of absolute motion or rest misleading?
The idea of absolute motion or rest is misleading because motion is always relative to other objects. There is no universal reference point that determines absolute motion or rest. This concept is further supported by Albert Einstein's theory of relativity, which states that there is no absolute frame of reference in the universe.
