Friction
Friction is a Push or Pull?
What is PULL.
Forces are a ____ and a ______.
PUSH AND PULL
what do spring scales measure
what happens when 2 equal forces act on an object in opposite directions?
Rough Surfaces have more or less friction?
More mass = _____ force applied to accelerate.
More
What would make it easier to pull a box up a ramp?
A. Make the ramp higher
B. Make the ramp shorter and less steep
C. Add more weight to the box
D. Pull the box faster
b) Make the ramp shorter and less steep.
If a spring scale stretches more, what does that say about the force?
What happens when one force is stronger then the other?
Unbalanced, and the objects motion will change.
You're testing how far a marble rolls on different surfaces: carpet, tile, and wood.
Which question are you trying to answer?
A. Which marble is the heaviest?
B. Which surface causes more friction?
C. Which room has the most space?
D. Which marble is the fastest?
B) which surface causes more friction
Which change would increase the amount of force needed to pull a wagon?
a) Add more mass to the wagon.
b) Take out mass from the wagon.
c) Use a smaller wagon.
What is a) Add more mass to the wagon.
Emma rolls a toy truck down a ramp made of stacked books. She removes one book each time and sees how far it rolls.
What tool should she use to measure the distance the truck went?
Ruler/yard stick
How does a spring scale show the difference between light and heavy objects?
35N to the right are applied to one side of a box, and 45N are applied on the left side of the box. Which way will the box move?
To the left
A student hangs a cup from a spaghetti noodle and adds pennies until it breaks.
What is the student testing?
A. How tall the cup is
B. How much force the spaghetti can hold before breaking
C. How many pennies make noise
D. How fast pennies fall
B) how much force the spaghetti can hold before breaking
what is the biproduct of friction?
Heat
what happens to the amount of force applied when the ramp gets steeper?
More force is needed.
Liam uses a spring scale to pull a wooden block across a table.
He adds weights to the block each time.
What is he MOST LIKELY trying to find out?
A. If the block changes size
B. If the table is flat
C. If more mass needs more force to pull
D. If the block is made of metal
C) More mass needs more force to pull.
why is it easier to push a shopping cart on a smooth surface than a rough surface?
Low friction surface ( Ex: smooth cement, hardwood, marble, tile, metal, plastic)
Why: because it has less resistant forces (friction) acting on it.
Which experiment is the BEST example of a fair test?
A. Pushing two different toy cars on two different ramps
B. Pushing the same toy car on the same ramp with the same force each time
C. Changing the toy car, the ramp, and the force each time
D. Rolling a car on a ramp one time and guessing the answer
B) pushing the same toy car on the same ramp with the same amount of force.
When pushing a box up a ramp, what direction is the force of Gravity acting?
Down the ramp
How could you use a spring scale to measure the force needed to pull a car?
Attach the hook to the car and pull
How is my force on a shopping cart changed from when I first push it through the store when its empty, compared to once I have it full of groceries?
Less force is applied when its empty, and more more is applied to move the cart when its full.