What is a FORCE that pulls everything to the center of the earth.
OR
the force that pulls objects toward each other
The bigger the mass, the greater the pull.
100
All objects accelerate the same due to gravity. TRUE OR FALSE?
What is TRUE
100
An objects ability to resist motion. (it wants to continue doing what it's doing)
What is INERTIA
100
True or False. Using snow tires on an icy road is an example of increasing friction.
What is TRUE. (Anything trying to slow you down would increase friction.)
200
Which is a form of decreasing friction intentionally?
A. Putting snow tires on a car when the road is icy.
B.Oil on a a squeaky door hinge.
C.Wearing cleats in field sports.
D.None of the above.
What is B? Putting oil of a squeaky door hinge.
200
What is the measurement of the force of gravity on an object?
A. Adhesion
B. Weight
C. Friction
D. Acceleration
What is WEIGHT?
200
What is the speed limit for falling objects called?
What is TERMINAL VELOCITY (maximum speed you reach when you fall).
FYI - for adult skydivers, it's about 122 MPH.
200
Do objects with more mass have MORE or LESS INERTIA?
More mass - more inertia. (More resistance to change).
300
Give an example of why FRICTION is important in life.
TO SLOW THINGS DOWN LIKE:
Brake pads
traction on shoes
Parachutes
ETC
300
Objects that are closer, pull with more strength than objects that are farther away. The closer things are to one another, the more powerful the attraction. What is this called?
What is the law of universal gravitation?
300
Why would you want to point your feet downward to fall faster when sky diving?
How should you lay if you want to fall more slowly and why?
To decrease surface area, therefore have less DRAG.
Lay flat with arms out to increase surface area and increase air resistance, DRAG.
300
A rocket taking off is an example of which of Newton's laws? A.1st
B.2nd
C.3rd
D.Gravity
What is the 3rd law (for every action there is an equal and opposite reaction).
300
The type of friction experienced in water or air.
What is DRAG?
400
Give 2 examples of things that reduce friction.
What is oil and water (any lubricant).
400
Who discovered GRAVITY?
Who is ISAAC NEWTON?
400
A force that acts on a body moving in a circular path and is directed toward the center around which the body is moving is called what?
(An example is the sling David used to kill Goliath)
Centripetal force
400
Which of Newton's laws states: That an object at rest will stay at rest and an object in motion will stay in motion at a constant velocity, unless acted upon by an unbalanced force. A.1st
B.2nd
C.3rd
D.Gravity
What is 1st law - inertia
400
The sticking together of 2 different materials is called ______ while ________ is the sticking of material to itself.
What is ADHESION (sticks to other things)
What is COHESION (sticks to each other)
500
Friction between 2 objects that keeps them from sliding across each other is called what?
What is TRACTION?
500
Why doesn't the moon move the earth very much even though each PULL on each other due to gravity? Be specific.
Earth has a bigger mass (81 times bigger)
500
Why do all objects fall at the same rate?
Heavier objects have more inertia (resist movement more) to resist earth's pull. Lighter objects have less mass, so less inertia to resist movement.
In other words, heavier objects resists inertia more than lighter ones.
500
How is the EGG DROP an example of INERTIA and F=MA?
Egg resisted movement MORE than toilet paper roll because it has more MASS. (Egg has more Inertia).
The greater the mass, the more inertia and the more force is needed to accelerate it. Egg stayed where it was until gravity pulled it down.
500
Why is it important for swimmers to make their bodies as sleek as possible? (Answer scientifically and give examples of HOW they do this)
To resist DRAG. Diving in with correct hand and leg position, suit type, shave hair of body, wear caps...