# Why does a child in a wagon seem to fall backward when you give the wagon a sharp pull forward?

Though the legs of the child may get pulled along with the wagon, the upper body of the child wants to remain at rest, therefore it has a tendency to fall backward as the wagon is pulled forward.

## What’s Newton’s first law of motion?

1. Newton’s First Law of Motion (Inertia) An object at rest remains at rest, and an object in motion remains in motion at constant speed and in a straight line unless acted on by an unbalanced force.

## What is Newton’s third law of motion?

Newton’s third law simply states that for every action there is an equal and opposite reaction. So, if object A acts a force upon object B, then object B will exert an opposite yet equal force upon object A.

## Is acceleration directly or inversely proportional to force?

Newton’s 2nd Law. Acceleration is produced by a net force on an object and is directly proportional to the magnitude of the force, in the same direction as the force, and is inversely proportional to the mass of the object.

## What is the SI unit of force?

The SI unit of force is the newton, symbol N. The base units relevant to force are: The metre, unit of length — symbol m. The kilogram, unit of mass — symbol kg. The second, unit of time — symbol s.

## What is Newton’s 2nd law called?

The other name for Newton’s second law is the law of force and acceleration.

## What is the formula of law of inertia?

Newton’s second law of motion describes this phenomenon and property with an inertia formula that states “Force = Mass * Acceleration”. The formula states that objects that have more mass require more force to change their acceleration.

## What is Newton’s law formula?

Newton’s second law, which states that the force F acting on a body is equal to the mass m of the body multiplied by the acceleration a of its centre of mass, F = ma, is the basic equation of motion in classical mechanics.

## Is Newton’s third law always true?

In every action there is equal and opposite reaction. But this is a one sided law. It is not applicable in all the cases when the force is exerted between two bodies.

## What are the 7 types of forces?

• Applied Force.
• Gravitational Force.
• Normal Force.
• Frictional Force.
• Air Resistance Force.
• Tension Force.
• Spring Force.

## What is true inertia?

Inertia is a force which keeps stationary objects at rest and moving objects in motion at constant velocity. Inertia is a force which brings all objects to a rest position. All objects have inertia. A more massive object has more inertia than a less massive object.

## What is a negative newton?

If the applied force is in opposite direction to the displacement of the moving object then the force will be negative.

## Can an object have zero acceleration with only one force acting on it?

If only one force acts, the net force cannot be zero so the object cannot have zero acceleration.

## Is work done if you pull a child in a wagon?

Is work done if you pull a child in a wagon? Yes, the force applied is parallel to the direction of motion.

## What would your bathroom scale read if you weighed yourself on an inclined plane?

Normal force is perpendicular to the incline and has a magnitude of mg*cos(theta), with theta equaling whatever angle your incline is at. Thus your scale would be reading zero, which makes sense, because you wouldn’t be physically capable of standing on it.

## Is force a vector?

A force has both magnitude and direction, therefore: Force is a vector quantity; its units are newtons, N. Forces can cause motion; alternatively forces can act to keep (an) object(s) at rest.

## What is the unit velocity?

Velocity is a vector expression of the displacement that an object or particle undergoes with respect to time . The standard unit of velocity magnitude (also known as speed ) is the meter per second (m/s).

## What is the unit of speed?

So, What is the SI unit of speed? The SI unit of speed is given in terms of basic units of distance and time. Thus, the SI unit of speed is metre per second or m/s. The dimensions formula of speed is [M0L1T-1].

## What is the SI unit of momentum?

SI unit. kilogram meter per second (kg⋅m/s)

## What are 5 examples of Newton’s third law?

• Pulling an elastic band.
• Swimming or rowing a boat.
• Static friction while pushing an object.
• Walking.
• Standing on the ground or sitting on a chair.
• The upward thrust of a rocket.
• Resting against a wall or tree.
• Slingshot.

## Does force have mass?

Force (N) = mass (kg) × acceleration (m/s²). Thus, an object of constant mass accelerates in proportion to the force applied. If the same force is applied to two objects of differ- ent mass, the heavier object has less acceleration than the lighter object (Figure 1).

## What are the 3 types of inertia?

• Inertia:
• Different types of inertia with examples are given below.
• Inertia of rest:
• Inertia of motion:
• Inertia of direction:

## What are the 3 laws of inertia?

In the first law, an object will not change its motion unless a force acts on it. In the second law, the force on an object is equal to its mass times its acceleration. In the third law, when two objects interact, they apply forces to each other of equal magnitude and opposite direction.

## What is Alpha in torque?

τ = I α Where, τ is Torque(Rotational ability of a body). I is the moment of inertia (virtue of its mass) α is angular acceleration (rate of change of angular velocity).

## What are the 3 equations of motion?

• First Equation of Motion : v = u + a t.
• Second Equation of Motion : s = u t + 1 2 a t 2.
• Third Equation of Motion : v 2 = u 2 + 2 a s.