#### what international event led to the red scare

Red Scare. … World War I, which led many to embrace ...

What is the meaning of the expression ΣF = 0? It is the **mathematical expression of the Equilibrium Rule** – The sum of all forces equals zero. An object in mechanical equilibrium is an object. at rest, moving at constant velocity, with no acceleration.

Why is the support force on an object often called the normal force? **Because it acts at right angles to the surface**. Normal is another term for “right angle.” … You actually read the support force by the scale, which is the same as your weight when the scale is stationary.

Force and Motion

Forces **cause all motions**. Every time the motion of an object changes, it’s because a force has been applied to it. Force can cause a stationary object to start moving or a moving object to change its speed or direction or both. A change in the speed or direction of an object is called acceleration.

Power is defined as the energy (or work) per unit time. Since, time is not considered as a vector quantity, and neither energy or work because the work is not directional. … So yes, the power is a scalar quantity **because it has a unit magnitude but no direction**.

Force is stated as **a vector quantity**, meaning it has elements of both magnitude and direction. Mass and acceleration respectively. In layman’s terms, force is a push or pull that can be defined in terms of various standards. Dynamics is the study of the force that causes objects and systems to move or deform.

scalar, a physical quantity that is completely described by its magnitude; examples of scalars are **volume**, density, speed, energy, mass, and time. Other quantities, such as force and velocity, have both magnitude and direction and are called vectors. Scalars can be manipulated by the ordinary laws of algebra. …

We know that force is a vector quantity but the pressure is **considered to be the scalar quantity**. Although force is along the direction of the area which is taken into account, the direction of the quantity remains unchanged making the pressure a scalar quantity.

**Force cannot be described using a scalar**, since force has both direction and magnitude; however, the magnitude of a force alone can be described with a scalar, for instance the gravitational force acting on a particle is not a scalar, but its magnitude is.

Electric field strength is a **vector quantity**; it has both magnitude and direction.

**A quantity that has magnitude but no particular direction is described as scalar**. A quantity that has magnitude and acts in a particular direction is described as vector.

vector, in physics, a quantity that has both magnitude and direction. … For example, **displacement, velocity, and acceleration** are vector quantities, while speed (the magnitude of velocity), time, and mass are scalars.

A vector is a **quantity that has both a magnitude and a direction**. Vector quantities are important in the study of motion. Some examples of vector quantities include force, velocity, acceleration, displacement, and momentum.

The most familiar **non-contact force** is gravity, which confers weight. In contrast a contact force is a force which acts on an object coming physically in contact with it. All four known fundamental interactions are non-contact forces: Gravity, the force of attraction that exists among all bodies that have mass.

The normal reaction force is the force the ground exerts on the object to prevent the object from sinking into the ground. It can be zero. In which case, it would means that the object is floating just above the surface, not really touching it. But **it cannot be negative**.
## How do you find FN?

The weight of an object equals the mass of the object multiplied by the acceleration of gravity. Multiply the two values together. In order to find the normal force, you need to **multiply the weight of the object by the cosine of the angle of incline**. Write your answer.
## Why do we say that velocity is a vector and speed is not a vector?

## Does normal force always point up?

## Is a normal force a contact force?

Velocity arises from a vector (displacement) while speed arises from a scalar (distance), hence Velocity is a vector (magnitude and direction) and speed is a scalar (magnitude only). … This is due to the fact that **speed is a scalar quantity** and not a vector.

Newton’s third law says that for every force, there is an equal and opposite force: for an object on a non-inclined plane, the force of gravity is straight down and **the normal force is straight up**.

Normal force is **a contact force**. If two surfaces are not in contact, they can’t exert a normal force on each other. … It makes sense that the force is perpendicular to the surface since the normal force is what prevents solid objects from passing through each other.
## Why can’t we walk easily on ice?

## Is force and motion the same?

## Does a force always produce motion explain?

## Is volume a vector quantity?

## Is torque a vector?

The **coefficient of friction is low** and much less than one. A system with a low coefficient of friction has a low resistance to the surfaces sliding across one another. The fact that ice has a very low coefficient of friction it is difficult to apply force; hence it makes it difficult to walk on the ice.

the Big idea: Force and motion are **fundamental to all matter in** the universe. A force is anything that can push or pull on an object. Forces influence objects that are at rest or that are already in motion. Isaac Newton’s three laws of motion involve inertia, mass, velocity, and momentum.

Once you apply a force to an object, it will move. … If the answer is zero, as in one force pulling one way and the other pulling the opposite direction exactly, then those forces will basically cancel each other out. So **yes, forces will always result in motion**, unless there is another force exactly opposed to it.

**Volume is not a vector quantity but a scalar quantity**. A scalar quantity has only magnitude but a vector quantity has both magnitude and direction. Apart from volume, mass, speed, energy, time, etc., that have magnitude are scalar quantities.

Note that the SI units of torque is a Newton-metre, which is also a way of expressing a Joule (the unit for energy). However, torque is not energy. So, to avoid confusion, we will use the units N.m, and not J. The distinction arises because energy is a scalar quanitity, whereas **torque is a vector**.
## Is density a vector quantity?

## Why is net force a vector sum?

**Vector** Quantity: A physical quantity is said to be a vector quantity when it has both magnitude and direction. The scalar quantities are distance, mass, time, volume, density, speed, temperature, and energy, The vector quantities are weight, velocity, acceleration, and force.

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