Forces
Describe a situation that would create this free body diagram. (see other board for drawing)
any object being pushed across a surface at CONSTANT Velocity or an object being pushed, but remaining at REST
What are the units for speed we see most frequently in this class?
What is m/s
What is the value for acceleration due to gravity on earth?
What is -9.8 m/s^2
Jamil is moving at a constant speed of 20 m/s. How far did he travel in 3 seconds.
What is 60 meters.
What does the slope of the line represent on a velocity vs. Time graph?
What is acceleration
Explain how a bumper helps in a crash using forces and time
What is "Bumpers increase the time of the collision and so decrease the force on the person"
A vector has both ___________ and ____________.
What is Magnitude and Direction
Without air resistance present, which will hit the ground first (if dropped from the same height), a coin or a feather?
What is a both. If there is no air resistance, the only force and acceleration is due to gravity
Jill dropped a penny (from rest) off a cliff. How far did the penny fall in 3 seconds (neglect air resistance)?
What is 45 meters (use equation d=v0*t +1/2at^2)
How do you find velocity from a distance time (x-t) graph?
Find the slope V=x/t
What are the two words in a word problem that signal that the SPEED IS ZERO?
What is "dropped" or "at rest"
State the equation of acceleration using the following variables (final velocity, initial velocity, time)
What is Final Velocity - Initial Velocity All divided by Time
Gravity is only present on the earth and is anywhere else. True or false?
What is false.
If Tyler drove a total distance to school in his car of 60 miles and it took him 1 hour to drive to school, what is his average speed? (in miles per hour)
What is 60 miles per hour
What does the slope of the line represent on a Force Vs. Acceleration Graph?
What is Mass
A large student pushes on a tiny student (mean!) The tiny student goes flying. Which student felt a larger force and why?
The same! Newton's second law, there are equal and opposite forces.
What are the units for acceleration most frequently used in this class?
What is meters per second squared m/s^2
Karl has a mass of 58 kg on Earth. What is his mass on the moon (g = 1.62 m/s^2)?
What is 58kg
Sarah was travelling at 15 m/s and then sped up to 42 m/s in 12 secs. What was her acceleration?
What is 2.25 m/s^2
On a Distance Vs. Time graph draw a line that represents changing velocity?
What is "draw any line that is not straight (curved)"
Can an object that is moving experience no net force? Explain.
Yes! Asteroids in space, when all the force arrows cancel out. A book being pushed at constant velocity
If Mr. Phillips (because Ms. Olson would never be this reckless) is driving his car at 70 m/s and his velocity goes down to 30 m/s in 4 seconds, what is his acceleration?
What is - 10 meters per second squared
What happens to the force of gravity if you double the mass of the object?
The force of gravity is doubled.
Steve threw a ball straight up into the air with an initial velocity of 20 m/s. What is the ball's velocity 2 seconds later, at the top of the throw?
What is 0 m/s. *Remember at maximum height, your velocity in the y direction is ZERO
On a Speed Vs. Time Graph draw a line that represents constant constant acceleration.
What is any straight line