Motion & forces
Forces
Forces & Energy
Things to know
Other Physics questions
100
The object that appears to stay in place is known as what?
The reference point
100
Forces must become ________ inorder for motion to stop.
Balanced
100
What causes an object to change its motion?
an unblanced force.
100
What contact force slows down a roller coaster as it moves down hill?
friction
100
These scientific ideas are proven true and can not be changed.
Scientific Laws
200
A compass works due to what force?
Magnetic force
200
If a box is on the ground and friction is an opposing force of 60N, how many Newtons do you need to apply to move the box.
Greater than 60N.
200
What type of energy is the greatest at the top of the first hill of a roller coaster?
potential energy
200
Which item on the moon is 1/6 of that on Earth? Mass or Weight?
Weight
200
Why should you repeat a lab multiple times?
ensures accurate results.
300
What is the net force of a boat being paddeled 80N west against a current that is 50N east.
30N west
300
What non-contact force attracts metal?
magnetic
300
What do we call energy that is lost during energy conversions?
Waste energy.
300
What is a dependent variable?
The result of the change of your independent variable.
300
What is the INDEPENDENT variable of a lab testing how the height of a ramp will affect a cars speed?
The ramps height
400
What is the speed of a runner who goes 20 meters in 4 seconds. Include units.
5 m/s
400
What are the three non-contact forces?
magnetic gravity electric
400
What does the law of conservation of energy state?
Energy cannot be created or destroyed, just changes forms
400
If forces are in the same direction, what do you do to them to calculate net force?
Add them
400
What force keeps Earth in orbit?
Gravity
500
If you drive from jacksonville to Miami which is 300 miles in 4 hours, what is your average speed? include units.
75 MPH
500
Dog A is pulling on a rope with 65N east and dog B is pulling on the rope with 48N west. What is the net force AND to what direction?
17N to the east
500
Give me and example of potential energy being converted into kinetic energy.
anything not in motion going into motion.
500
What type of experiment do you change one variable at a time?
a controlled experiment
500
What are the two ideas the law of gravity states?
G force increases with mass and decreases with distance
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