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37 Cards in this Set

  • Front
  • Back
The difference between impulse and impact force involves
the time the force acts
A heavy truck and a small car rolling down a hill at the same speed are forced to stop in the same amount of time. Compared to the force that stops the car, the force needed to stop the truck is
greater
Is it correct to say that impulse is equal to the change in momentum.
Yes
The impulse-momentum relationship is a direct result of
Newton's second law
Compared with the force that brings a small car to a stop, the force required to bring a heavy truck traveling at the same speed to a stop depends on
the time involved
An object is raised above the ground gaining a certain amount of potential energy. If the same object is raised twice as high, it gains
twice as much potential energy
If you push an object twice as far while applying the same force, you do
twice as much work
A freight train rolls along a track with considerable momentum. If it rolls at the same speed but has twice as much mass, its momentum is
doubled
A job is done slowly, while an identical job is done quickly. Both jobs require the same amount of work, but different amounts of
power
A rock is thrown upward at 35 degrees with respect to the horizontal. As it rises, its horizontal component of velocity remains
unchanged
Exert 2 N for a distance of 1 m in 1 s and you deliver a power
2 W
Exert 200 J in 50 s and your power output is
4 W
An object that has potential energy may have this energy because of its
location
Heat energy is measured in units of
joules and calories
A machine puts out 200 W of power for every
1000 W put into it
The efficiency of the machine is
20%
When the distance between two stars decreases by half, the force between them
increases to four times as much
A toy cart moves with a kinetic energy of 40 J. If it moves with three times of initial speed, its kinetic energy will be
360 J
When a bimetallic bar made of copper and iron strips is heated, the bar bends toward the
iron strip. The reason for this is copper expands more than iron.
The force of gravity on a 600-N woman standing on the Earth's surface is
600N
Moon is most responsible for the
Ocean tides
The main reason ocean tides exist is that the
pull of the moon is greater on oceans closer to the moon and less on oceans farther from the moon
When you touch a cold piece of ice with your finger, energy
flows from your finger to the ice.
An Earth satellite is simply
projectile freely falling around the Earth
A ball thrown straight upward takes 20 s to go up and return to the ground. Because of air resistance, the time taken for the ball just to go up is
less than 10 s.
Planets would crash into the sun if it weren't for their
tangential velocities
Earth satellites are typically more than 100 km high so as to be above the Earth's
atmosphere.
The fact that a thermometer "takes its own temperature" illustrates
thermal equilibrium
Compared to a giant iceberg, a hot cup of coffee has higher temperature, but less
thermal energy.
Before ice can form on a lake, all the water in the lake must be cooled to
4eC
Ice tends to form at the
surface of bodies of water
When an iron ring is heated
the hole becomes larger
Boiling Points
100eC, 212eF, 373.15K
Frozen Points
0eC, 32eF, 273.15K
1 calorie = how many Joules
4.18
Standard Unit of temperature is
Kelvin
1st on Force
Galileo