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4A Science
Chapter 15 Lesson 2
| Question | Answer |
|---|---|
| What is any push or pull? | force |
| A force can make a moving object: | slow down, stop, move faster or change direction |
| A force can make an object that is standing still start to | move |
| In what direction does the object move in comparison to the force? | the same direction as the force |
| Some forces only act on contact so it must | touch the object (a marble on a flat surface will not move unless you touch it) |
| Some forces can act from a distance so it can move objects | without touching them (a magnet can move a piece of iron towards it) |
| What can change both the size and the position of an object? | pushing or pulling |
| The size of the change depends on the strength of the | push or pull |
| What happens when the sizes of the forces pulling from either side are the same? | balanced |
| What happens if the strength of pulling on one side becomes greater and the sides are not balanced? | object moves toware the greater force |
| What do all forces have? | size and direction |
| What do balanced forces acting in opposite directions do? | cancel each other out |
| What is the resistance an object has to any change to its motion? | inertia |
| What happens if balanced forces are applied to a moving object? | it will keep moving at the same speed and in the same direction |
| What is needed to change the motion of an object with more mass? | more force |
| A full wagon needs ________ | more force |
| An empty wagon needs: | less force |
| What is friction | a force that acts when two surfaces rub together |
| What can friction do to moving objects? | slow them down or stop them |
| What two things determine the amount of friction between two objects? | surface and how hard objects push together |
| When rough surfaces rub together you have: | lots of friction |
| When smooth surfaces rub together you have: | a little friction |
| A greater force causes: | more friction |
| How can friction be reduced? | oil, wax, wheels |
| Who said: " An object at rest will stay at rest unless acted upon by an outside force." | Sir Isaac Newton |
| Who said "An object in motion will continue moving unless acted upon by an outside force." | Sir Isaac Newton |
Created by:
critmccoy
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