Chapter 15 Lesson 2
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| What is any push or pull? | force
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| A force can make a moving object: | slow down, stop, move faster or change direction
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| A force can make an object that is standing still start to | move
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| In what direction does the object move in comparison to the force? | the same direction as the force
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| 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)
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| 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)
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| What can change both the size and the position of an object? | pushing or pulling
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| The size of the change depends on the strength of the | push or pull
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| What happens when the sizes of the forces pulling from either side are the same? | balanced
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| What happens if the strength of pulling on one side becomes greater and the sides are not balanced? | object moves toware the greater force
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| What do all forces have? | size and direction
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| What do balanced forces acting in opposite directions do? | cancel each other out
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| What is the resistance an object has to any change to its motion? | inertia
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| What happens if balanced forces are applied to a moving object? | it will keep moving at the same speed and in the same direction
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| What is needed to change the motion of an object with more mass? | more force
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| A full wagon needs ________ | more force
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| An empty wagon needs: | less force
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| What is friction | a force that acts when two surfaces rub together
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| What can friction do to moving objects? | slow them down or stop them
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| What two things determine the amount of friction between two objects? | surface and how hard objects push together
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| When rough surfaces rub together you have: | lots of friction
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| When smooth surfaces rub together you have: | a little friction
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| A greater force causes: | more friction
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| How can friction be reduced? | oil, wax, wheels
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| Who said: " An object at rest will stay at rest unless acted upon by an outside force." | Sir Isaac Newton
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| Who said "An object in motion will continue moving unless acted upon by an outside force." | Sir Isaac Newton
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Review the information in the table. When you are ready to quiz yourself you can hide individual columns or the entire table. Then you can click on the empty cells to reveal the answer. Try to recall what will be displayed before clicking the empty cell.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
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