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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

A car accelerates from 30mph to 40mph give an expression for the net force causing this acceleration?

m = mass of car

dV = change of velocity

dM = change in momentum

T= time

a = acceleration mile/hour2

dVmph =40mph - 30mph

dVmpg = a*T

dM = mdV*T

F = ma

impulse = FT = maT

What determines whether or not work is being done?

Work is done when a force is applied to an object and it causes the object to move in the direction of the force. Mathematically, work is calculated as the force applied multiplied by the distance the object moved in the direction of the force. If there is no movement or if the force is not in the same direction as the movement, then no work is being done.

According to newtons second law of motion does weight depends on an objects mass and the net force acting on the object?

Well, Weight is a force that equals mass times the gravitational acceleration.

i.e. F = m * g, on Earth g= 9.81 m/s/s (or meters per second squared).

So to answer your question, no. The Weight of an object depends only on its mass and the acceleration due to gravity.

A 2000 kg car can accelerate from 0-30 ms in 6 seconds assume all force generated by the engine goes into acceleration how much force is produced?

The acceleration of the car can be calculated using the formula a = Δv / Δt, where Δv is the change in velocity and Δt is the time taken. Plugging in the values, a = (30 m/s - 0 m/s) / 6 s = 5 m/s^2. The force produced can be calculated using the formula F = m * a, where m is the mass of the car. F = 2000 kg * 5 m/s^2 = 10,000 N.

Which surface would you slide further on-road covered in ice or straw?

You would slide further on ice because it has a lower coefficient of friction compared to straw. Ice offers less resistance, allowing for smoother sliding and covering a greater distance compared to straw, which provides more friction and slows down movement.

How do you find the mass of an object if it accelerates at 2.5ms2 with a force of 12N?

You use the formula: F = ma, or force = mass x acceleration. Solving for mass: m = F/a.

You use the formula: F = ma, or force = mass x acceleration. Solving for mass: m = F/a.

You use the formula: F = ma, or force = mass x acceleration. Solving for mass: m = F/a.

You use the formula: F = ma, or force = mass x acceleration. Solving for mass: m = F/a.

What is the net force of an object in equilibrium?


You and I stand on opposite ends of a small car.

You are in the back, pushing it forward with a force of 100 pounds. I am in the front, pushing it backward with a force of 100 pounds.

I don't know what the "force" on the car is. Is it 200 pounds, 100 each from you and me ? Do we also have to add in the weight of the car ... another 2,000 pounds of gravity pushing it downward ? How about the reaction force of the pavement ... another 2,000 pounds pushing it upward ? I don't know.

But I do know the net force on the car ... it's zero. The two horizontal forces on it cancel each other, because they're directed in opposite directions. Same for the vertical forces. Which is why the car doesn't accelerate in any direction ... because the net force in that direction is zero.

An airplane travels 80 km in 10 minutes and then flies 100km in 20 minutes the average speed of the plane is?

An airplane travels 80 km in 10 minutes and then flies 100km in 20 minutes the average speed of the plane is?

80 km in 10 minutes = 8 km/min

100km in 20 minutes = 5 km/min

Average speed = total distance traveled ÷ total time

Average speed = 180 km ÷ 30 min = 6 km/minute

Notice the average speed is closer to 5 km/min, because the plane spends twice as much time traveling at the slower speed.

How an object can have forces acting on it but not be accelerating?

Yes - if the sum of the forces is zero.

Yes - if the sum of the forces is zero.

Yes - if the sum of the forces is zero.

Yes - if the sum of the forces is zero.

How can you move in frictionless surface?

On a frictionless surface, you can move by applying a force in the direction you want to go. Once you start moving, you will continue in a straight line at a constant velocity due to the absence of friction to oppose your motion. controlling speed and direction may require external influences like walls or other objects.

Can you give me 50 problems on laws of acceleration?

I can provide you with some examples:

  1. A car accelerates from rest at a rate of 2 m/s^2.
  2. A ball is dropped from a height of 10 meters.
  3. A rocket launches into space at a constant acceleration of 10 m/s^2.
  4. A bicycle speeds up from 5 m/s to 10 m/s in 4 seconds. Please let me know if you would like more examples.

A 1000kg car travelling 25miles per second east has a collision with a 1500 kg van initially at rest using conservation of linear momentum what is their common velocity immediately after the collision?

1000kg car travelling 25miles per second east has a collision with a 1500 kg van initially at rest using conservation of linear momentum what is their common velocity immediately after the collision? I also assume the 1000 kg car is going 25 m/s, since 25 mi/s = 25 mi/sec * 5280 ft/mi ÷ 3.28ft/m = 40,243.9 m/s or 90,000 mi/hr.(jet speed)

Be careful when you type in units!!

Because the question asks, "what is their "common" velocity immediately after the collision?", I assume they are stuck together. Momentum = Mass * velocity

Think about a heavy object sitting still. Could you move this heavy object by throwing a light object at the heavy object, very fast? Is it possible? That is the theory behind momentum.

Momentum is conserved, so the total momentum of both objects before collision = the total momentum of both objects after collision.

Ma* Va (initial) + Mb*Vb (initial) = (Ma + Mb) * Vtotal(final)

Ma = 1000 kg

Va (initial) = 25 m/s

Mb = 1500 kg

Vb (initial) = 0 (at rest)

(Ma+ Mb) 2500 kg

Vtotal(final) = ?

Substitute the values of the variables into the equation and solve for

Ma* Va (initial) + Mb*Vb (initial) = (Ma + Mb) * Vtotal(final)

(1000 kg) * (25 m/s) + (1500 kg) * ( 0 m/s) = (2500 kg) * Vtotal(final)

Vtotal(final) = (37,500 Kg*m/s ) ÷ (2500 kg)

Vtotal(final) = answer is between 10 m/s and 20 m/s.

What is true meaning of the law of acceleration?

What is true meaning of the law of acceleration?

If you mean Newton's 2nd law which states that a force causes a mass to accelerate.

Acceleration measures how fast your velocity changes.

I will give you an example.

If you know a child with a wagon, this could be fun. The child is sitting on the wagon. Right now the child is at rest (velocity =0). He does not like being at rest, so he asks you to push him. As you push him he giggles, oh what fun. He is now moving (v = 6 m/s, not 0). Your friend said, "Do that again, and I will time how many seconds it takes for you to get him going that fast." It took 2 seconds for you to reach a velocity of 6 m/s. That means you were accelerating at a rate of 3 m/s each second.

When you push the wagon, you exert a force, which causes the child and wagon to accelerate.

Newton's 2nd law states that a force causes a mass to accelerate

1) Your push is the force.

2) The child and wagon are the mass.

3) The acceleration is the result.

As a formula, Force = mass * acceleration

I hope this helps

Balancing the forces acting on an object give you the net force?

Yes, balancing the forces acting on an object involves ensuring that the sum of all forces is zero, which means there is no net force acting on the object. This equilibrium condition results in the object either remaining at rest or moving at a constant velocity.

What do you call the tendency of matter to stay at at rest if it is at rest of to to move if it is moving?

This tendency is known as inertia. Inertia is the property of matter that causes objects to resist changes in their motion.

What distance does it move vertically?

What distance does it move vertically?

Throw a ball straight up.

Gravity will slow it down at the rate of 9.8 m/s each second.

Example

A ball is thrown up at a velocity of 49 m/s.

Due to gravity it will slow down at the rate of 9.8 m/s each second.

After 5 seconds the ball will stop, it is at its highest point; the velocity is 0 m/s.

The initial velocity was 49 m/s; the final velocity is 0m/s.The average velocity is 24.5 m/s.

Distance = Average velocity * time

Distance = 24.5 m/s * 5 seconds = 122.5 m

Here are the physics equations I used!!

Acceleration due to gravity = g = -9.8m/s each second = -9.8m/s^2 (negative because gravitational force pulls down toward the center of the Earth!!

Vfinal = Vinitial + (acceleration * time)

0 m/s = 49m/s+ (-9.8m/s^2 * time)

-9.8 t = - 49m/s

t = 5 seconds

Average velocity = (49m/s + 0) ÷ 2

Average velocity = 24.5 m/s

Distance = Average Velocity * time.

Distance = 24.5 m/s * 5 seconds

Distance = 122.5 m

Is the net force zero if the object is not moving?

Yes, but an object with net force of zero may still be moving. The net force is zero if the object is not accelerating.

What acceleration will result when a 12N net force is applied to a 3kg object?

According to Newton's second law, Force = mass x acceleration. From the equation F = ma, one can deduce that

A = F/m

Simply plug in the known values and solve.

A = (12 N) / (3kg)

A = 4 m/s^2

The answer is 4 meters per second squared.

What the difference between the acceleration of a baseball one earth compared to the moon?

The acceleration due to gravity on Earth is approximately 9.81 m/s^2, while on the moon it is only 1.62 m/s^2. This means that a baseball will accelerate more slowly on the moon compared to Earth due to the lower gravitational force.

The inertia of a bowling ball is what the inertia of a basketball?

No, the inertia of a bowling ball is greater than the inertia of a basketball due to the bowling ball's larger mass. Inertia is the resistance of an object to changes in its state of motion, and a heavier object like the bowling ball requires more force to accelerate or decelerate compared to the basketball.

If an object has no net force acting on it?

If an object has no net force acting on it, it will either remain at rest or continue moving at a constant velocity in a straight line, following Newton's first law of motion.

If a freely falling object is equipped with a odometer Would the readings of distance falling each second indicate equal or unequal distances of fall for successive seconds?

It depends on how heavy the rock is. The heavier it is the faster it will fall.

No. Acceleration due to gravity is independent of weight. Galileo proved as much.

acceleration due to gravity is dependent on latitude but is always near 10m/s2

What does a seat belt have to do with Newton's first law of motion?

Whiplash occurs due to the fact that your head is at rest and stays to tend at rest, as explained by inertia/Newton's first law. In the case of a rear-end collision, your head resists the impact while the back of the seat drives to rest of your body forward so suddenly and your head is jerked back relative to your body.

Why a balloon filled with helium do not follow the newton first law of motion when it is tied in bus which in motion?

If the balloon accelerates (changes its speed), then that means that forces act on it. If any object "does not follow" Newton's First Law, that means that the conditions are not fulfilled - the conditions being that no net force acts on an object.

When a frog jumps off a lilypad and the lilypad moves backwards which of Newton's laws is this?

This situation is an example of Newton's third law of motion, which states that for every action, there is an equal and opposite reaction. The frog exerts a force on the lilypad (action), causing the lilypad to move backwards (reaction) in the opposite direction.

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