The force of air against a moving object - also called drag
100
An object at ____________ tends to stay at __________.
Rest
100
Spell the answer:
A push or a pull is a _____________.
F-O-R-C-E
100
If two objects are dropped from the same height (one heavy and one lighter) which will hit the floor first?
They will hit at the same time.
200
On Earth, the pull of gravity is always ______________.
towards the center of the earth
200
What is one way to reduce friction when moving a heavy object?
Use wheels, lotion, or some other surface that is low in friction
200
A force that equals speed multiplied by mass
Momentum
200
Spell the Answer:
A pulling force that gives us weight on Earth.
G-R-A-V-I-T-Y
200
Is it possible to move without friction? Yes or no and why?
No we could not move without friction. We need friction to get traction on the ground to move - otherwise we would slip and fall and be unable to get up.
300
Gravity is always in a horizontal direction. True or False?
False. It is always in a vertical direction because the pull of gravity is down to the center of the Earth.
300
When do we want air resistance? Give an example.
In general to slow down - such as jumping from an air plane (a parachute) or to slow a car and help it stop. Also, using air resistance to go - such as sails on a boat or a kite.
300
An object in motion tends to stay in motion in a ______________________ and ______________________
unless acted upon by an unbalanced or net force.
straight line and constant speed
300
Spell the answer:
_________________ is a property of Matter.
I-N-E-R-T-I-A
300
Friction takes motion energy and converts it into _____.
Heat energy
400
Who is the famous scientist who did gravity experiments with cannon balls from the top of the Leaning Tower of Pisa?
Galileo Galilei
400
How do skates use friction to move on ice?
the blades create a little bit of water so that the skater can glide on top of the water.
400
when forces "cancel each other out" we say that the forces are ________________________.
Balanced forces
400
Spell the Answer:
Speed and direction
V-E-L-O-C-I-T-Y
400
How do slugs use friction to move and climb trees?
The mucus that they make is sticky and slippery allowing them to ooze along on the mucus and climb trees or walls because of the stickiness.
500
What fraction is the pull of gravity on the moon?
1/6 - so objects weigh one sixth the weight on the moon that they do on earth.
500
Why do meteors burn up when they enter Earth's atmosphere from space?
The speed of the meteor against the air resistance creates heat which burns the meteor up in the atmosphere.
500
Finish this sentence:
According to Newton's 1st Law of Motion, in outer space, a ball thrown would continue moving ______________
in a straight line and constant speed forever
500
Spell the Answser:
Also called the "Bashing Force," the mass and speed of an object determines this.
M-O-M-E-N-T-U-M
500
The gravitational pull on an object depends on two things:
1. ??
2. ??
1. How much mass an object has
2. How close the object is (the sun has a lot of gravity - but is far away so we do not notice it).