Scientific Investigations (1.1)
Why do scientists replicate investigations?
To make sure the results are reliable and valid, or accurate.
What is the definition of potential and kinetic energy?
Potential: Stored energy
Kinetic: Energy in motion
List 3 non-contact forces
Gravity, Magnetic, Electrostatic
Define unbalanced forces
Unequal forces, causing change in speed or direction
TRUE OR FALSE: Scientific theories never change.
False, scientific theories can be updated with new evidence.
Potential energy
Contact or non-contact: a magnet picking up a metal screw
Non-contact
Balanced or unbalanced: A person is leaning against a wall.
Balanced; the person is not moving.
“My theory is that everyone is coughing because the classroom is too cold.”
Why is this statement considered an everyday theory and not a scientific theory?
It is not based on evidence, he is using his opinion.
True or False: Total energy can decrease
FALSE!!! Energy is never lost, only transformed.
Which 2 forces are acting on a ball while it is resting on the ground?
Label the 2 forces either contact or non-contact.
Normal force (contact)
and gravity (non-contact)
(Image)
What is the net force? ____ N
Balanced or unbalanced?
0N, balanced!
Why do scientists conduct observational investigations?
To observe the natural world with controlling or manipulating anything.
Describe the energy transformation: A car coming to a stop at a red light.
How does mass relate to gravitational force?
Increased mass = Increased gravity
Decreased mass = Decreased gravity
Draw a graph representing 3 motions:
constant speed, stationary, fast constant speed
(Image)
Gabby wondered how different liquids would affect the growth of sunflowers. To design an investigation, she planted three of the same size sunflower plants in the same type of pot. She placed all three pots next to each other where they would receive full sun. Once a day, each pot received a different liquid.
Pot A - 200 mL of coffee
Pot B - 200 mL of soda
Pot C - 200 mL of fruit juice
What type of investigation is this?
Comparative
BONUS POINTS *200* Why is this NOT an experimental investigation?
(Image)
Describe the energy transformation from
point X to point Z.
Potential to kinetic energy.
How does gravitational force relate to distance?
Increased distance (farther apart) = less gravity
Decreased distance (closer together) = more gravity
Draw a graph representing the motions:
Noah left class and walked quickly to the dean's office. He waited for the dean and then quickly returned to class.
constant speed, stationary, return to start