flashcards

Question 1

Acceleration

Answer 1

in physics, is the rate of change of velocity of an object. An object’s acceleration is the net result of any and all forces acting on the object, as described by Newton’s Second Law.

Question 2

Attract

Answer 2

to draw by a physical force causing or tending to cause to approach, adhere, or unite; pull (opposed to repel ): The gravitational force of the earth attracts smaller …

Question 3

Balanced forces

Answer 3

When two forces acting on an object are equal in size but act in opposite directions, we say that they are balanced forces. If the forces on an object are balanced (or if there are no forces acting on it) this is what happens: an object that is not moving stays still.

Question 4

Deceleration

Answer 4

When a ball rolls on the ground and slows down to a stop, the ball is decelerating. Deceleration is the term used for acceleration that causes an object to slow down. In general, acceleration is motion where the speed of an object changes every secon

Question 5

DISTANCE

Answer 5

Distance is a scalar quantity that refers to “how much ground an object has covered” during its motion. Displacement is a vector quantity that refers to “how far out of place an object is”; it is the object’s overall change in position.

Question 6

Energy

Answer 6

In physical science, energy means the ability to do work. Work means a change in position, speed, state, or form of matter. Therefore, energy is the capacity to change matter. Everything we do involves energy.

Question 7

Electrostatic force

Answer 7

Electrostatic Force[edit] As we now know, charged objects exert a force on one another. If the charges are at rest then this force between them is known as the electrostatic force.

Question 8

Froce

Answer 8

In physics, a force is any interaction which tends to change the motion of an object. In other words, a force can cause an object with mass to change its velocity (which includes to begin moving from a state of rest), i.e., to accelerate. Force can also be described by intuitive concepts such as a push or a pull.

Question 9

Force diagram

Answer 9

Free-body diagrams are diagrams used to show the relative magnitude and direction of all forces acting upon an object in a given situation.

Question 10

Force field

Answer 10

In physics a force field is a vector field that describes a non-contact force acting on a particle at various positions in space. Specifically, a force field is a vector field , where is the force that a particle would feel if it were at the point .

Question 11

Friction FORCE

Answer 11

Friction is a force that is created whenever two surfaces move or try to move across each other. Friction always opposes the motion or attempted motion of one surface across another surface. Friction is dependent on the texture of both surfaces.

Question 12

GRADIENT

Answer 12

The gradient is a vector operation which operates on a scalar function to produce a vector whose magnitude is the maximum rate of change of the function at the point of the gradient and which is pointed in the direction of that maximum rate of change. In rectangular coordinates the gradient of function f(x,y,z) is:

Question 13

GRAVITY

Answer 13

At Earth’s surface the acceleration of gravity is about 9.8 meters (32 feet) per second per second. Thus, for every second an object is in free fall, its speed increases by about 9.8 meters per second. At the surface of the Moon the acceleration of a freely falling body is about 1.6 meters per second per second.

Question 14

LUBRIENT

Answer 14

Lubrication is the process or technique employed to reduce friction between, and wear of one or both, surfaces in close proximity and moving relative to each other, by interposing a substance called a lubricant between them

Question 15

MAGNETISM

Answer 15

Magnetism refers to physical phenomena arising from the force between magnets, objects that produce fields that attract or repel other objects

Question 16

NEWTON

Answer 16

unit of force, 1904, named in honor of Sir Isaac Newton (1642-1727). In the meter-kilogram-second system, the unit of force required to accelerate a mass of one kilogram one meter per second per second, equal to 100,000 dynes

Question 17

NORTH POLE

Answer 17

The “North Pole” refers to multiple places: the geographically northernmost point on Earth, the magnetic north, and, most enchantingly, Santa’s headquarters. The North Pole has inspired human imagination, scientific exploration and political conflict for decades.

Question 18

REACTION TIME

Answer 18

Since reaction time is the length of time between a stimulus and a person’s response to it, we could say that reaction time is important for every sport. We normally think of a starting pistol for a race, and the shorter the race the more critical reaction time is

Question 19

REPEL

Answer 19

if you bring a north pole and a south pole together, they attract and the magnets may stick together. if you bring two north poles together, or two south poles together, they repel and the magnets push each other away.

Question 20

S.I. UNITS

Answer 20

The International System of Units (abbreviated SI from French: Système international d’unités) is the most widely used system of units of measurement. There are seven base units and 22 derived units (excluding compound units). These units are used both in science and in commerce.

Question 21

SOUTH POLE

Answer 21

The Amundsen–Scott South Pole Station is a US scientific research station at the Geographic South Pole, the southernmost place on the Earth. The station is located on the high plateau of Antarctica at an elevation of 2,835 metres (9,301 feet) above sea level.

Question 22

SPEED

Answer 22

In conclusion, speed and velocity are kinematic quantities that have distinctly different definitions. Speed, being a scalar quantity, is the rate at which an object covers distance. The average speed is the distance (a scalar quantity) per time ratio.

Question 23

TICKER TIMER

Answer 23

n you work out the speed of an object you need to know how far it goes in a certain time. The distance is fairly easy to find, use a ruler, but if the object is moving quickly the time it takes will be hard to measure. The ticker timer makes dots on a paper tape every fiftieth of a second

Question 24

TIME

Answer 24

Time is a measure in which events can be ordered from the past through the present into the future, and also the measure of durations of events and the intervals between them. Time is often referred to as the fourth dimension, along with the spatial dimensions.

Question 25

UNBALANCED FORCE

Answer 25

When two forces acting on an object are not equal in size, we say that they are unbalanced forces. If the forces on an object are unbalanced this is what happens: an object that is not moving starts to move. an object that is moving changes speed or direction.

Question 26

VELO

Answer 26

Velocity is a vector physical quantity; both magnitude and direction are required to define it. The scalar absolute value (magnitude) of velocity is called “speed”, a quantity that is measured in metres per second (m/s or m.HI