Forces and Motion (up till the Assessed Investigation)

• laterally inverted - turned around or flipped images
• refraction - an effect that occurs when waves travel into different substances
• transparent - something that you can see straight through
• force - push or pull on an object due to the interraction with another object
• exerted - applied or used
• non-contact force - a force exerted when objects are touching
• contact force - a force exerted when objects are touching
• friction: the resistance that one surface or object encounters when moving over another
• upthrust - the upwards force created when a fluid is displaced
• displaced - moved out of the way
• drag - force created to oppose motion through a fluid
• gradient - the slope of a graph
• weight = mass X gravitational field strength
• when there is zero net force acting, an object can continue moving at a constant speed in a straight line
• density - the quantity of mass in a given volume
• speed = distance / time
• aristotle believed that objects were made up of 4 elements: earth, air, water and fire. a heavier object with more earth and a lighter one with more air, like a feather
• galileo believed that mass did not affect the speed an object falls at, objects are accelerated by gravity and the speed they reach depends on the distance they are falling