Metric System
What is the prefix for one-thousandth (0.001)?
Milli
What is the formula for speed?
Speed = distance ÷ time
What is the unit of measurement for force?
Newton (N)
What type of energy is stored due to position?
Potential
How is speed different from velocity
Speed is how far an object travels over time, velocity is how far and in what direction an object travels over time
Convert 2.5 kilometers to meters.
2,500 m
What is the formula for force? (Newton's 2nd Law)
Force = mass × acceleration
A 10-kg box is pushed with 5 m/s² acceleration. What is the net force?
50 N
(F = ma)
What type of energy is motion?
Kinetic energy
What is the formula for acceleration?
Acceleration = (final v – initial v) ÷ time
A rock has a mass of 2.45 kg. What is its mass in grams?
2,450 g
What is the formula for kinetic energy?
KE = ½mv²
If Andre pushes a box with an applied force of 400 N and friction opposes with 130 N, what is the net force?
270 N
(400 N - 130 N)
When a roller coaster car is at the top of the first hill, it has mostly __________ energy. As it speeds down the hill, that energy is transformed into __________ energy.
Potential → Kinetic
On a distance-time graph, on which axis is the distance and which axis is the time?
Time is on the x-axis, distance is on the y-axis.
Convert 0.034 liters to milliliters.
34 mL
In the formula, PE = mgh, what does the "g" stand for and what is the value with units?
g is acceleration due to gravity: 9.8 m/s2
A book rests on a table. What force balances gravity?
Normal force
A 3-kg ball is rolling at 4 m/s. What is its KE?
24 J
Define momentum and give its formula.
Momentum is a measure of mass in motion or how much "oomph" an object carries
Formula: p=mv
p=mv (momentum = mass × velocity)
A student measures a table as 1.26 m. Convert to centimeters, then millimeters.
126 cm, 1260 mm
What is the formula for density?
density = mass ÷ volume
A 1,200-kg car accelerates at 2 m/s². What net force is acting on it?
2400 N
A pendulum is swinging back and forth. Explain how the pendulum shows the Law of Conservation of Energy as it moves from the highest point to the lowest point.
At the highest point it has maximum potential energy and almost no kinetic energy; as it swings down, potential energy is transformed into kinetic energy; at the lowest point it has maximum kinetic energy.
On a distance-time graph, what does a horizontal line represent? On a velocity time graph, what does a horizontal line represent?
On a distance -time graph a horizontal line represents the object at rest or stopped. On a velocity- time graph, a horizontal line represents moving at constant speed (no acceleration).