Chapter 11: Motion
What is the formula for calculating speed?
Speed = Distance / Time
What units do we use when measuring force?
Newtons (N)
True/False: Once a nonrenewable resource has been used up, it is gone forever.
False
Nonrenewable energy resources take millions of years to naturally form, therefore they will take a very long time to be replaced but will eventually come back.
______________ is the length and direction of a straight line connecting starting point to end point.
Displacement is the length and direction of a straight line connecting starting point to end point.
How do you know if the net force of an object is balanced or unbalanced.
Balanced forces will have a net force equal to 0.
Unbalanced forces will have a net force not equal to 0.
What does a flat, horizontal line represent on a distance-time graph?
Object is at rest
What does gravity equal here on Earth?
9.8 m/s2
What two factors effect an object's kinetic energy?
Mass and Velocity
Force of attraction between any two objects with mass is known as ___________.
Force of attraction between any two objects with mass is known as Gravity.
Which region are most of the world's oil supplies located?
Middle East
What does it mean if an object's acceleration is negative?
Object is slowing down
Which law of motion tells us that as an object's mass increases, acceleration will decrease; while if force increases, acceleration will increase?
Newton's 2nd Law of Motion
Which form of energy travels in waves, having some electrical and some magnetic properties?
This form of energy is also known as "light" energy.
Electromagnetic Energy
______________ is the change in speed divided by time.
Acceleration
Name 3 out of the 6 forms of energy.
(Hint: Do NOT say "kinetic" or "potential")
Mechanical
Chemical
Electromagnetic
Nuclear
Electrical
Thermal
When will an object's displacement be equal to 0?
When its end point is the same as its starting point
What are the 4 main types of friction?
sliding friction
rolling friction
static friction
fluid friction
Name 3 examples of Renewable Energy Resources
- Solar Energy
- Wind Energy
- Hydroelectric Energy
- Geothermal Energy
- Biomass
- Nuclear Fusion
________ energy is energy stored due to an object's position or shape.
Potential energy is energy stored due to an object's position or shape.
What energy transformation takes place when you use a microwave to heat your food?
A) Thermal -> Electrical -> chemical
B) Electrical -> Electromagnetic -> Thermal
C) Electrical -> Mechanical -> Thermal
D) Mechanical -> Nuclear -> Thermal
B) Electrical -> Electromagnetic -> Thermal
Electrical Energy from microwaved being powered on when plugged in
Electromagnetic Energy in the "microwaves" that pulse through your food as waves
This changes to thermal energy as your food heats.
An object moves 50 miles north, stops, then travels 20 miles south.
1) What is the object's distance?
2) What is the object's displacement?
(don't forget to include direction)
1) What is the object's distance?
50 mi + 20 mi = 70 mi
2) What is the object's displacement?
(don't forget to include direction)
30 mi North
John pulls on a rope to the right with 40 N of force, Bill and Adam pull on the rope to the left. Bill pulls with 20 N and Adam pulls with 18 N.
What is the net force on the rope? What direction will it move?
40 N - (20 N + 18 N)
40 N - 38 N = 2 N Right
A 10 kg object rolls at a speed of 3 m/s.
Calculate the Kinetic Energy of the object.
**KE=1/2 mv2
KE = (0.5) x (10 kg) x (3 m/s)2
KE = 5 kg x 9 m/s
KE = 45 J
_________ __________ is the constant speed of a falling object that occurs when the force of gravity and air resistance are equal.
Terminal Velocity is the constant speed of a falling object that occurs when the force of gravity and air resistance are equal.
Give me an example of newton's 3rd law of motion.
answers will vary