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SFS Science Unit 4
Motion and Forces
| Question | Answer |
|---|---|
| force | a push or pull |
| force | sometimes you can see a ---- force acting, when a hits a tennis ball |
| result | other times you can seee the ----- of the force |
| acting | you know a force is ---- because something moves |
| wind, magnetic force, electic force | are examples of force that can act on objects but cnnot be seen |
| gravity | the force of attraction that exists beween any two objects |
| equally | the force of gravity between two objects acts ----- on both objects |
| weakens; farther apart | the force of gravity is greater between more massive objects and the force of gravity --- as 2 objects move ---- ----- |
| length | in science, forces are represented by arrows. an arrow's ---- shows the strength of a force |
| direction | the ---- of the arrow shows the direction of the force |
| net force | the combination of all the forces acting on an object |
| balanced forces | equal forces acting in opposite directions |
| zero | if the forces acting on an object are balanced, the net force is ----- |
| unbalanced | if the forces acting on an object are ---- the net force is not zero and the object moves as a result of the net force |
| speed | equals the distance traveled divided by the time it takes to travel that distance |
| average speed | equals the total distance traveled divided by the total distance time taken to travel the distance |
| instantaneous speed | the speed of an object at one instant of time |
| velocity | speed and direction of a moving object |
| kilogram (kg) | SI unit for mass; approximately 2.2 pounds |
| acceleration | change in velocity divided by the time for the change to occur; occurs when an object speeds up, slows down, or turns |
| momentum | measure of how hard it is to stop a moving object; calculated as mass times velocity |
| mass | amount of matter in an object |
| law of conservation of momentum | the total momentum of objects that collide with each other is the same before and after the collision |
| vibrational | a type of motion - music |
| circular | a type of motion - ferris wheel' tire |
| straight line | a type of motion - jet |
| distance | the total length of the path taken between 2 points |
| does not | distance ---- ---- include the direction of travel |
| total distance | add the sum of the lengths of the paths taken |
| displacement | includes both the shortest distance between 2 points and the direction of travel |
| far & in what direction | displacement describes how ---- ----- ------ one point is from another |
| speed | the distance an object moves in a certian period of time |
| speed | --- = distance ÷ time |
| instantaneous speed | the speed at any given point |
| velocity | the measure of both the speed and direction of a moving object |
| changes | velocity ----- when either speed or direction changes |
| acceleration | the change in velocity during a particular ime period |
| speeds | acceleration occurs when an object ---- up, slows down, or changes direction |
| constant | there is no acceleration when the velocity is constant (cruise control) |
| momentum | measure of how hard it is to stop an object |
| momentum | P = mass X velocity |
| mass | momentum increases if the ----- or velocity of the object increases |
Created by:
lyncall
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