Forces
True or False: The strength of a bar magnet is at its poles.
True
A rock setting on the edge of a cliff has what kind of energy?
Potential
A baseball thrown through the air will continue on its path until which force acts upon it?
Friction
Who discovered the Laws of Motion?
Sir Isaac Newton
The force that pulls a falling leaf towards earth
Gravity
Which of the following would be attracted to a magnet
a. Wooden golf tee
b. Rubber band
c. Paper clip
c. Paper clip
Does this demonstrate Kinetic or Potential energy?
A runner races against another runner.
Kinetic energy
Rate at which an object changes speed or direction
Acceleration
State the 1st Law of Motion (+50 points - give an example)
An object at rest remains at rest. An object in motion goes at constant speed until an outside force acts upon it.
Backpack on ground and ball on ground that is kicked
List 2 examples for magnetic objects and 2 objects that are NOT magnetic.
magnetic: paper clip, desk legs, whiteboard, etc
non-magnetic: wood, plastic, concrete, etc
A toy car is released at the top of a ramp. How does its energy change as it rolls down? (think of the types of energy)
Its Kinetic Energy increases, and its potential energy decreases.
Give an example of a hypothesis
"I think that the plastic ball will move further than the stainless steel ball."
What is the 2nd law of motion? (+50 points - Give an example)
Force = Mass x Acceleration
You push on the wall with a force of 60N. The wall doesn't move. What do we know about the amount of force the wall exerts back on us?
The wall exerts the same amount of force.
True or False: the further a magnetic object is from a magnet, more force is given to the object.
False
A 20 kg ball and a 50 Kg ball rest at the top of a ramp. Which has greater Potential Energy? WHY?
50 KG - because it has the GREATER MASS!
True or False: Energy can be destroyed
FALSE
What is the 3rd LAW of Motion? (+50 points - give an example)
For every action there is an equal and opposite reaction
When are magnets attracted to each other AND when do magnets repel each other?
N-S (attract)
N-N OR S-S (repel)
True or False: Increasing the height of an object also increases the potential energy of the object.
True
Jess wanted to test to see if the tennis ball rolled faster on tile floor rather than carpet. She let go of the ball at the same height on the ramp and used the same tennis ball in both trials. Jess measured how far the ball travelled in centimeters and timed how long it took to travel 3 meters.
What is the INDEPENDENT variable?
Type of floor the ball is rolled on.
What law is this? "When Mike's dad bowled, his bowling ball went faster and further than Mike's did"
Newton's Second Law