What is a force that opposes motion between two surfaces?
200
the surface material
What is the independent variable in the experiment with the wooden block and pennies and different surface materials?
200
10N
A boy pulls a wagon with a force of 6N east as another boy pushes it with a force of 4N east. What is the net force?
200
a. hat resting on your head
b. a box rolling on a floor
Which of these is an example of kinetic friction?
300
sandpaper
Which surface material created the MOST friction?
300
N (newton)
What is the SI unit of force?
300
a. a hat resting on your head
b. a cat running in the yard
Which of these is an example of static friction?
400
a. what is the effect of different surface materials on friction force?
b. what is the effect of surface area on friction force?
c. how does the mass of the object placed on the block affect friction force?
Which experimental question best matches the procedure for lab 2 of adding mass to block?
400
a. net force of zero
b. balanced force
c. unbalanced force
Which of the following causes an object to change its motion?
400
hills and valleys
What is the reason friction occurs?
500
No. Adding mass to the block did in fact create MORE friction. The more mass added, the more friction created.
Students concluded that adding mass to the block had no effect on the friction force. Based on your lab, is there conclusion correct?
500
a. balanced
b. unbalanced
c. a push
d. a pull
When the net forces equal 0 N, they are which of the following?