1D/2D Motion
What does UDEA stand for?
Understand the problem, Devise a plan, Execute the plan, Access the result
What force is pulling you down to the ground?
Gravity
Linear velocity is the rate of change of...?
displacement
What kind of energy does a spring have?
Elastic Potential
Why does an egg break when it is dropped from a large height but not when it is dropped from a lower height?
the force is larger
Is it possible to change your velocity without changing your speed?
Yes, because you can move at a constant speed when walking in a circle
What are free body diagrams used to determine?
the forces acting on an object
If an object is in uniform (constant speed) circular motion, its acceleration must point…?
toward the center
A bowling ball is attached to a rope connected to the ceiling. I am going to release the ball from my chin, what will happen when I let go?
It will not hit me
There are two balls, one "Happy" and one "Sad". The happy ball bounces and the sad ball just plops on the ground. Which one do you think would be better at knocking over a piece of wood?
Happy Ball, because it had a bigger change in momentum. Which means it applied a greater force.
Your _____ is how much distance you change in a given amount of time
Speed
Is it possible for an object to be moving at a constant velocity if there are exactly three forces acting on it?
Yes
An object will experience more air resistance when it falls if it has greater…?
surface area
If I pull on a spring, what kind of energy is now stored in it?
Two objects are known to have the same momentum. Do these two objects necessarily have the same kinetic energy?
No
A person is moving to the left at a constant speed, is their velocity and acceleration positive or negative?
it depends
When a string or rope or wire pulls on an object, it exerts a contact force called the _____?
Tension Force
What would happen to the force of gravity between two objects if you doubled one of their masses?
It would double
If an object starts at rest, how do we give it kinetic energy?
by applying a force on it
If you drop a basketball with a tennis ball sitting on top of it. What will happen to the basketball and tennis ball after it hits the ground?
The basketball will stay on the ground and the tennis ball will go flying.
Charlotte is trying to throw a ball straight up to Dash who is in a window up off the ground. If it takes 120 secs for the ball to just barely get to the top, how fast did Charlotte throw the ball?
120 m/s
A large object and a small object crash into each other, which one exerts a larger force?
They both exert the same amount
If the Sun was half as massive and the Earth was twice as massive, how would the new gravitational force compare to the original force between the Sun and Earth?
Unchanged
You need to move a heavy box into a moving truck. Your first option is to just lift the box into the truck. Your second option is to push the box up a frictionless ramp into the truck. Which requires the mover to do less work?
They are the same
The momentum of a system is conserved only when...
There is no net external force acting on the system