| Push and Pull Forces | ||
| #1 | Forces make things move or stay still by..... |
pushing or pulling |
| #2 | What are the two types of push and pull forces? |
Contact and non-contact forces |
| #3 | When a person jumps out of an airplane, is that a contact or non-contact force? |
non-contact force |
| #4 | What happens to an object when forces are unbalanced? |
it can make an object start moving, speed up, slow down, change direction or stop |
| #5 | What is a balanced force? |
When two forces applied to the table are opposite and equal |
| Magnetism | ||
| #1 | Is magnetism a contact or non-contact force? |
non-contact |
| #2 | What are the two ends of the magnet called? |
North Pole and South Pole |
| #3 | True or False: All magnets are man-made. |
False: some magnets are natural, for example mineral magnetite |
| #4 | What happens when you have a north pole and a north pole of a magnet together? |
They repel |
| #5 | Fill in the following blanks:
Magnets create a _____________ around them. We cannot see these forces but they attract objects made of _______ and _________. |
magnetic field, iron, steel
Magnets create a magnetic field around them. We cannot see these forces but they attract objects made of iron and steel. |
| Gravity and Weight | ||
| #1 | True or False: All masses have gravity | True |
| #2 | Which one of these conclusions from Newton are correct? 1.) Small masses pull big masses towards them. 2.)The bigger the mass, the stronger the pull 3.) The farther the mass, the stronger the pull |
#2 is correct, The bigger the mass, the stronger the pull |
| #3 | Who discovered gravity and when? |
Isaac Newton over 300 years ago |
| #4 | Is the weight of a kangaroo higher on the moon or the earth? Why? | The kangeroo would have a higher weight on the earth because the force of gravity is higher. |
| #5 | What would happen if the Earth did not have gravity? | Our belongings and us would float away |
| Upthrust | ||
| #1 | True or False: Upthrust is a contact, push force applied by water and air | True |
| #2 | Who discovered upthrust? | Archimedes, an ancient greek scientist |
| #3 | A bird flying is an example of upthrust? Why or why not? | Yes, a bird flying has upthrust from air and and is pulled down by gravity due to its weight |
| #4 | Which would fall slower if dropped from a building, a piece of paper or a mobile phone? Why? | A piece of paper would fall slower because it has a small mass and big volume |
| #5 | Why does a rubber duck float and a metal duck sink? | A rubber duck has balanced forces (weight of the duck=upthrust). A metal duck has unblanced forces (weight> upthrust) |
| Forces in Tennis | ||
| #1 | Tennis uses (contact/non-contact) forces to move the ball | contact |
| #2 | True or False: Players use a raquet to apply pull forces to the ball | False; they apply push forces |
| #3 | Push force makes the ball change___________. | direction |
| #4 | Does a big push force make the ball speed up or slow down? | speed up |
| #5 | Players move about by applying the push forces to the ___________ with their legs and feet. | ground |
| Final Question | |
| What is the problem for astronauts using a pen in space? | There is no gravity so the pen does not work |