# Science -Force and Motion words

### 39 terms by jinnyloke

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useful words to know for force and motion

### motion

changing position, the act of changing location from one place to another

### triangle formula

a method used to rearrange the symbols of scientific equations

### distance

how far an object has travelled, size of the gap between two places

### unit

what a variable or quantity is measured by

### time

how long a journey takes

### speed and velocity

how fast an object is travelling (both names, s----- and v-------)

### speedometer

instrument used to measure speed/velocity, a meter fixed to a vehicle that measures and displays its speed

### instantaneous speed

the speed of an object at one instant in time

### average speed

a measurement of the middle rate of speed of a journey

### distance-time graph

graph in which distance is measured against time

### slope

steepness of a graph line

### stationary

object that is not moving due to equally applied forces

### constant speed

object that is moving at the same rate because of equally applied forces

### acceleration

increase of the speed/velocity of an object

### deceleration

decrease in the speed of an object

### quantity

an amount of something

### variable

an aspect of a situation/experiment that is changed

### scientific formula

an equation that links several variables

### compression

squashing of an object

### extension

the act of lengthening/stretching an object

### mass

amount of matter in an object

unit of mass

### kilogram

equal to 1000 grams

### weight

force of gravity on an object

### gravitational force

caused by the gravitational pull of the Earth

unit of force

### directly related

one variable increases as the other increases

### inversely related

one variable decreases as the other increases

### volume

amount of space an object or substance occupies

### density

mass of a standard volume of a substance

### friction

force which arises when two substances rub together

### drag

friction created when a solid passes through air or water

### kinetic energy

energy possessed by moving bodies

### heat energy

energy which causes a rise in temperature

### pressure

force acting per unit area

### balanced forces

equal and opposite forces

### Newton's First Law

an object will remain still or at a constant speed unless acted on by an outside unbalancing force

### action-reaction

forces always come in pairs

### gravity

forces of attraction between bodies that have mass eg. people to earth, the moon to the earth, the earth to the sun

Example: