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
science test 1/26
studystack for science
| Question | Answer |
|---|---|
| force | a push or a pull ex- you exert a force on a chair when you pull it away from a table |
| like velocity and acceleration, a force is described by its ( ) and by the direction in which it acts | strength |
| newton | A unit of measure that equals the force required to accelerate 1 kg of mass at 1 m per second per second |
| what happens if there is a non zero net force? | A non-zero net force causes a change in the object's motion |
| net force | The overall force on an object when all the individual forces acting on it are added together |
| friction | the force that two surfaces exert on each other when they rub against each other |
| sliding friction | occurs when two solid surfaces slide over each other |
| static friction | acts between objects that aren't moving |
| fluid friction | occurs when a solid object moves through a fluid |
| rollling friction | when an object rolls across a surface |
| gravity | a force that pulls objects toward each other |
| what is the law of universal gravitation | The law of universal gravitation states that the force of gravity acts between all objects in the universe that have mass |
| why is earth's gravitational force on nearby objects so strong? | Earth's gravitational force on nearby objects is so strong because the mass of Earth is so large |
| The ( ) an object has, the greater the gravitational force between it and other objects | more mass |
| what two factors does gravitational force depend on? | mass: earth has more gravitational force than you because it has greater mass distance: you are attracted to earth, not the sun or moon. You are closer to earth |
| weight | a measure of the force of gravity on an object |
| If your weight is around 560 N on earth and 90 N on the moon do you lose weight on the moon? (look at pg 4 on notes packet) | no, your mass is the same on Earth as it would be on any other planet, but weight varies with the strength of the gravitational force. On the moon you would weigh about 1/6 of what you would weigh on Earth but you will always be your normal weight |
| momentum | the product of an objects mass and velocity |
| equation for momentum? | p=m x v (p= momentum) (m= mass) (v=velocity) |
| the more momentum a moving object has, the ( ) | harder it is to stop |
| A ( ) also can produce a large momentum, even when mass is small. A bullet shot from a rifle for example has a large momentum. Even though it has a small mass it travels at a high speed | high velocity |
| what two factors does momentum depend on? | mass: the higher the mass, the larger the momentum velocity: the higher the speed, the larger the momentum |
| velocity equation | v= p/m |
| mass equation | m= p/v |
| free fall | when the only force acting on an object is gravity |
| the force of ( ) causes the object to accelerate. Free fall is motion where the acceleration is caused by gravity | gravity |
| Near the surface of Earth, the acceleration due to gravity is 9.8 m/s*2. If there were no ( ), a falling object would have a velocity of 9.8m/s after one second and 19.6m/s after two seconds and so on. | air friction |
| satellite | objects that orbit around other objects in space |
| does a satellite need fuel once it enters a stable orbit? | Once it has entered a stable orbit, a satellite does not need fuel. It continues to move ahead due to its inertia |
| centripetal force | a force that causes an object to move in a circular path |
| centripetal means? | center seeking |
| what would happen if you could turn off a centripetal force | If you could turn off a centripetal force, inertia would cause the object to fly off in a straight line |
| Do balanced forces affect motion (net force = 0) | no |
| Do unbalanced forces cause motion (net force ≠ 0) | yes |
| Let's say a dog that is 30 newtons pushes a box of cereal to the right and a dog that is 20 Newtons pushes the same cereal box to the left. Is there a change in the net force? | Yes, the box will accelerate to the right. When forces act in opposite directions the net force is in the same direction as the larger force (pg 1) |
| what factors does the strength of friction force depend on? | surface of object and how hard they are pushed together |
| what is gravitational acceleration | 9.8 m/s |
Created by:
emilybinderiya