Vocabulary
This is the definition of what term: when two objects make contact, and their motion or shape may change
Collision!
If two phones are dropped from the same height, what might be one reason why one phone breaks and the other doesn't?
A stationary cart begins moving after another cart hits it is an example of
a collision, or kinetic energy transfer
What has more of an impact on kinetic energy: an objects mass or speed
SPEEEEEEEED!
What was the most exciting part of this unit?
Probably when we kept it positive.
This is the definition of what term: A force that is produced when objects or particles touch and interact.
What is a contact force?
Do all objects bend when a force is applied to them?
YEP! You betcha
A stick bends when a force is applied and returns to its original shape when the force is removed. The stick is behaving in what way? Inelastic or elastic?
Elastically
If two carts collide, at the moment of peak force what is true about the force of the two carts?
Each cart exerts an equally strong force but in opposite directions.
What has more KE, a stationary ball or a ball thats being held up in the air?
The ball that is being held up in the air.
If during a collisions a rubber ball flattens briefly and then returns to its original shape, what did the contact force do to the shape of the ball?
It temporarily deformed the ball.
What type of Collision was it when Troy's phone was kicked by his friend?
Collision Type B where one thing was moving and the other was stationary.
If a cart speed doubles and mass stays the same, how does its kinetic energy change?
It becomes 4 times as great.
If an objects speed is reduced to half, and the mass stays the same, what happens to its kinetic energy?
It becomes one-fourth as great
A force vs deformation graph is linear at first and then it does not return to its original pattern when a force is applied. What happened?
The object exceeded its elastic limit and deformed permanently.
The greatest deformation it can withstand before it deforms permanently.
How can a collision contribute to a concussion?
Large peak forces can transfer energy and cause sudden changes or deformation in brain tissue and cells.
A sliding box slows down and the contacting surfaces become warmer. What explains this change?
Friction transfers energy to the surface, so the energy turns into heat.
If a carts speed quadrouples (4x) and its mass stays the same. How does its KE change?
It becomes 16x as great
The mass of an object and its kinetic energy is what type of relationshop?
LINEAR
Name the two types of deformation an object can have?
Elastic or permanent
A moving cart collides with a stationary box, the box begins moving. Describe the transfer of kinetic energy.
The carts KE decreases as the KE is transferred to the box and then the boxes KE increases and eventually they both stop moving.
What type of investigation would be best to compare the effects of doubling mass vs doubling speed on collision damage?
Use the same cart and setup, change only the mass in one trial and then change only speed in another trial. Measure the damage consistently.
If an objects speed is tripled while its mass stays the same, what happens to the KE?
It triples too.
An atom is made up of subatomic particles called what?
Protons, neutrons, & electrons