Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
CA. Physics (Ch.2)
| Question | Answer |
|---|---|
| According to Aristotle, if something is moving, there must be | a force |
| Ancient scholars reasoned a cannon ball continues to fly because | air pushes it from behind |
| Galileo found that a ball having rolled down a ramp, then rolls up a ramp | to the same height |
| The property of an object to resist changes in motion is called | inertia |
| Galileo proposed that once an object is moving, in order to keep it moving | no force is required |
| An object moving in a straight line path at constant speed has a constant | velocity |
| On Earth, a kilogram of mass weighs about | 10 N |
| As tension in Burl's rope increases by 50 Newtons, the tension in the opposite rope changes by | -50 N |
| The support force on a book sitting on a table comes from | the atoms of the table |
| A 150 pound man stands with each foot on a different yet identical scale. If one scale reads 90 pounds, the other will read | 60 pounds |
| When the sum of forces on an object is zero, the object | might be at rest or might be moving |
| An airplane flying at a steady speed and steady altitude is | at dynamic equilibrium |
| When you drop a ball, it lands at your feet because | the ball moves with the Earth |
| An object in motion tends to | stay in motion |
| What two classes of motion did Aristotle advocate? | Natural motion and violent motion |
| What did Galileo conclude in his inclined-plane experiments? | He concluded that a ball rolling down an incline and onto a horizontal surface would roll indefinitely |
| What did Galileo demonstrate in his Leaning Tower of Pisa experiment? | He demonstrated that light and heavy objects gain the same amount of speed when falling. |
| What did Newton say was needed to change the motion of an object? | A non-zero net force |
| What is the net force when a pair of 5-N forces simultaneously act in the same direction on an object? | 10 N |
| Which of Newton's laws does the equilibrium rule illustrate? | Newton's first law |
| How much support force acts on a 200-N girl standing on a weighing scale? | 200 N |
| Inertia: | The property of things to resist a change in motion |
| Newton's 1st law (law of inertia): | An object at rest remains at rest, an object in motion remains in uniform straight line motion unless acted upon by a net force |
| Natural motion: | The "nature" of an object |
| Violent motion: | Un-Natural motion created by a violent collision/interaction with another object |
| Force: | A push or pull that is the result of an interaction between objects |
| Net force: | The vector sum of forces that act on an object |
| Vector: | An arrow drawn to scale used to represent a vector quantity |
| Vector quantity: | A quantity that has both magnitude and direction (force) |
| Scalar quantity: | A quantity that has magnitude but no direction (mass) |
| Resultant: | The net result of a combination of two or more vectors |
| Tension: | A "stretching" force |
| Mechanical equilibrium: | when the net forces of an object is zero |
| Equilibrium rule: | ∑F = 0 |
| Support force (normal force): | An upward force opposite to Earth's gravity |
| Static equilibrium: | An object at rest |
| Dynamic equilibrium: | an object steadily moving in a straight-line path |
| 30 kms is relative to | the Earth to the Sun |
Created by:
RosalynCranney