Forces
This is a push or pull measured in Newtons
A Force
This type of friction occurs when two surfaces slide past each other
sliding friction
Speed is distance divided by ______.
Time
1 kilometer equals how many meters?
1000 Meters
In an experiment testing how surface type affects friction, the type of surface is the:
independent variable
If two forces of 10 N act in opposite directions, the net force is
0 N
This type of friction occurs when an object is not moving.
static friction
The formula for speed is:
distance ÷ time
100 cm equals how many meters?
1 Meter
In an experiment testing how surface type affects friction
the measured friction force (in Newtons) is the:
Dependent Variable
When net force equals zero, forces are said to be:
Balanced Forces
Which is typically greater: static or sliding friction?
static friction
If a car travels 100 meters in 20 seconds, its speed is:
5 m/s
Convert 72 km/h to m/s
20 m/s
In a friction lab, keeping the same wooden car, same pulling angle, and same person pulling are examples of:
controlled variables (constants)
If a 15 N force acts right and a 5 N force acts left, the net force is:
10 N to the right
When a car rolls across the floor, the type of friction acting is:
rolling friction
Speed is a scalar or vector quantity?
scalar
Convert 500 g to kilograms
0.5 kg
A student graphs surface type on the x-axis and friction force on the y-axis. Why is surface type placed on the x-axis
it is the independent variable
If an object is accelerating, what must be true about the net force?
the net force must be unbalanced (not zero)
If mass increases, friction force generally ______.
increases
A change in speed over time describes:
acceleration
A car travels 2 km in 100 seconds. Convert distance to meters and find speed in m/s.
20 m/s
A student claims grass causes the most friction but only tested one trial per surface. What is the biggest flaw in this experimental design?
lack of repeated trials (insufficient data for reliability)