Motion
The force of gravity between two objects:
a. increases with mass and decreases with distance
b. increases with distance and decreases with mass
c. decreases with mass and increases with distance
d. increases with mass and increases with distance
A. increases with mass and decreases with distance
“An object at rest will stay at rest unless acted upon by an outside force.
An object in motion will stay in motion unless acted upon by an outside force.”
Work is done when:
A. You push against a wall
B. You lift a book
C. You stand on the floor
D. You hold a box
B - you lift a book, because you need distance
A. Pulley
B. Ramp
C. Gear
D. Wheel and Axle
B. Ramp
What does Nori call a bellybutton?
BEE BOO
Momentum is calculated by multiplying an objects mass by its what?
Velocity
Friction between objects produces what?
The force you apply to a simple machine is called what?
Effort
Name the 6 simple machines we learned about
Pulley, Lever, Inclined Plane, Screw, Wheel and Axel, Wedge
What did the gods make humans out of once the wooden people warped?
How fast an object's position is changing over time is the objects what?
Speed
Newton's second law of motion stated that force is equal to mass times what?
acceleration
What is the law of conservation of energy?
energy is never created or destroyed, it only changes form
Give an example when you use a lever.
Teeter-Totter, wheelbarrow, pulling nail out with hammer
What is 5 1/2 + 1 5/8
7 1/8
What is: a group of objects from which a position or motion is measured
Frame of Reference
Placing a dish on a higher shelf increases the dish's what?
Potential Energy
The unit that is used to measure force is the what?
Newton
Give an example of a compound machine AND what machines does it use?
Scissors, Pizza Cutter
Tied it to a matchbox car and ran it on the racetrack.
What units of measurement can you use for distance? (3 units)
Meters, Kilometers, Feet, Miles
Give an example of an action and reaction force.
Swimming - pushing the water back
If a machine is 50 percent efficient, how much energy must you apply to lift a 100-Newton weight a distance of 10 meters?
a. 2000 joules
b. 1000 joules
c. 500 joules
d. 100 joules
A. 2000 joules
where is the fulcrum on a bat?
Smaller end where you hold it.
Which explorer played a role in wiping out the Aztec empire?
Hernan Cortez