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physics 11/17/22
| Term | Definition |
|---|---|
| Newton's first law of motion | an object in motion will remain in motion unless acted upon by another force |
| Force | a push or a pull |
| mass | the amount of matter in an object |
| which of the following carts has the greatest inertia? 2kg moving at 3 m/s OR 4kg moving at one m/s | 4kg moving at 1 m/s (the speed is not important in determining inertia; what is the greatest inertia also means what is the greater mass, so look for the biggest number) |
| What is the base unit for mass? | kilogram(kg) |
| inertia | the tendency of an object to resist change in motion |
| what needs to act on an object to stop it from moving at a constant speed | an unbalanced outside force |
| in the real world a ball does not roll forever. what stops the motion of the ball? | an unbalanced outside force |
| given 2 different size masses moving at the same speed, which mass will have the greater inertia | the heavier mass |
| mass is a measure of | inertia |
| velocity | speed in a given direction |
| speed | The change in distance per unit of time |
| Acceleration | the change in velocity per unit of time |
| A vantage point with respect to which position and motion may be described | frame of reference |
| you throw a ball in a moving train. why is it important to establish a frame of reference when describing the speed of the ball (the ball is moving at 10mph; the train is moving at 80mph) | it's important because you will get 2 different answers if you don't establish a frame of reference |
| you push a ball; how far will it roll WITHOUT newtons first law | it will roll forever |
| you push a ball; how far will it roll WITH newtons first law | it will roll until acted on my unbalanced outside force |
| frame of reference EXAMPLE: John is driving a car at 35 mph, Amy is watching the car go by; what is the speed of John from Johns perspective vs Amy's? | John- 0mph (b/c hes just sitting in the car) Amy- 35mph (b/c she sees John drive by) |
| newtons second law | Force equals mass times acceleration; the acceleration of an object is directly proportional to the unbalanced force acting on it and inversely proportional to the objects mass |
| The direction of acceleration is the same as the direction of the ____ | unbalanced force |
| weight | the vertical downward force exerted on a mass as a result of gravity |
| free body diagram | a diagram showing all the forces acting on an object |
| for a constant force, what effect does increasing an objects mass have on its acceleration | if u increase the mass of an object, but use the same constant force, the acceleration will decrease because the object is heavier |
| An object weighs 30 N. how would you explain this statement according to what you know about mass and accel. due to gravity | for a 30N weight, the mass/object is experiencing a force of 30N, which is being applied downward due to earth's gravity |
| If you went to a planet with a HIGHER acceleration due to gravity, what would happen to your weight? What would happen to your mass? | your weight would increase, your mass would remain the same |
| if the mass increases, what happens to the acceleration? | it decreases |
| if the force increases, what happens to the acceleration? | it increases |
| (force equals mass times accel) F = 6kg times 4m/s | f=24 |
| 24 = 8kg times acceleration | a = 3m/s |
| instantaneous speed | the speed of an object at one instant of time |
| mass times acceleration = | newtons |
| change in speed divided by time interval | acceleration |
| mass time acceleration | force |
Created by:
burgia