Show:
Matter in Motion
Forces and Motion
Forces and Fluids
Work and Machines
Energy and Energy Resources
100
List the two types of friction.
Kinetic friction & static friction
100
Which of the following is in projectile motion? a. a feather falling in a vacuum b. a cat leaping on a toy c. a car driving up a hill d. a book laying on a desk
b. a cat leaping for a toy.
100
Which of the following statements about fluids is true? a. Fluids rarely take the shape of their container b. fluids include liquids and gases. c. fluids flow from areas of low pressure to areas of high pressure. d. fluids exert the most pressure in the downward direction.
the fluids in your body exert pressure that works against atmospheric pressure.
100
What is the unit for work?
Joule
100
Kinetic energy depends on a. mass and volume b. velocity and height c. weight and height d. velocity and mass
d
200
Explain the difference between balanced and unbalanced forces.
Unbalanced forces occur when the net force on an object is not 0 N; balanced forces occur when the net force equal 0 N.
200
What does Newton's frist law of motion say about objects at rest and objects in motion?
Newton's first law states that objects at rest remain at rest and objects in motion remain in motion unless acted upon by an unbalanced force.
200
Find the density of a rock that has a mass of 10 g and a volume of 2 cm ^3
5 g/cm^3
200
What are the 2 simple machines that make up a pair of scissors?
frist class levers and wedges. (also accept wheel and axle)
200
What two variables does GPE depend on?
weight and height
300
What are 2 things you must know in order to determine speed?
Distance and time
300
Use Newton's second law to describe the relationship between force, mass, and acceleration.
Newton's second law states that the acceleration of an object increases as the force acting upon it increases but the acceleration decreases as the mass of an object increases.
300
How does an object's density determine whether it will sink or float in water?
an object will float in water if its density is less than the density of water. An object will sink in water if its density is great than the density of water.
300
What is the unit for power?
Watt
300
Name 3 renewable resources
wind energy, solar energy, geothermal energy, hydroelectric energy
400
The gravitational force on Jupiter is approximately 2.3 times the gravitational force on Earth. If an object has a mass of 70 kg and a weight of 686 N on Earth, what would the objects weight and matter be on Jupiter?
70 kg and 1577.8 N
400
What force is necessary to accelerate a 70 kg object at a rate of 4.2 m/s?
F=70 kg x 4.2 m/s^2= 294 N
400
How do Bernoulli's principle and Pascal's principle differ?
Bernoulli's principle states that the pressure in a fluid decreases as the fluid's velocity increases. Pascal's principle states that a fluid in an enclosed container exerts pressure in all directions.
400
You and a friend together apply a force of 1000 N to a car, which makes the car roll 10 m in 1 min 40 s. What was the work done on the car?
W= 1000 N x 10 m= 10,000 J.
400
How are fossil fuels formed?
From decayed organic matter of plants and animals, which was subjected to millions of years of pressure under Earth's crust.
500
What is the average acceleration of a subway train that speeds up form 9.6 m/s to 12 m/s in .8 s on a straight section of track?
3 m/s^2
500
Calculate the momentum of a 2.5 kg puppy moving with a velocity of 4.8 m/s south.
p=2.5 kg x 4.8 m/s south=12kg*m/s south
500
What force opposes motion in a fluid? How does this force affect lift?
Drag is the force that opposes motion. Lift is often reduced when turbulence causes drag.
500
A lever allows a 35 N load to be lifted with a force of 7 N. What is the mechanical advantage of the lever?
MA=35 N / 7 N = 5
500
A box has 400 J of GPE. If the box weighs 100 N, how far above the ground is it?
4 m