1. Science Starter Monday, March 6
Fill in the blanks as you watch this 3 minute video clip:
The _________things rub together, the __________friction there is.
__________turns __________ into _________.
A world without __________ would be _____________.

2. 1. The harder things rub together, the more friction there is. 2
1. The harder things rub together, the more friction there is. 2. Friction turns work into heat. 3. A world without friction would be dangerous.

3. Friction

6. Friction slows down moving objects

7. What 2 Factors Influence Friction?
Type of surfaces (smooth or rough)
How much force is pushing them together (weight, pressure)

13. Is Friction GOOD or BAD?
Good: Walking, Writing, Sliding down a fire pole, breaking on a bike or in a car, lighting a match

15. Sometimes friction is bad
soil erosion, holes in your shoes and jeans, tires worn down

17. To make a slick, icy sidewalk have more friction, we can sprinkle sand on it.
To make stairs have more friction so people don’t slip down them, we can put sandpaper stickers on it.
To make the bathtub have more friction for safety, we can put rough stickers on the bottom of the tub.

19. Science Starter Thursday, March 24
Why is it hard to push a car?
What is inertia?