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Chap. 3 Test-Science
Chapter 3 Test
| Question | Answer |
|---|---|
| What's the difference between horizontal and vertical? | Horizontal- side to side Vertical- up & down |
| What is a projectile? | Anything that's shot/thrown through the air; moves horizontally and vertically at the same time |
| What is centripetal force/acceleration? | Centripetal force-Net force exerted toward the center of a curved path Centripetal acceleration-Acceleration toward the center of a curved path |
| Air Resistance | Friction-like force that opposes the motion of objects that move through the air |
| What three things can change air resistance? | The object's shape, size, or speed |
| Terminal Velocity | Highest velocity a falling object will reach |
| What can change an object's terminal velocity? | The size, shape, or mass of the object |
| Gravity | Attractive force between any two objects that depends on the masses of the objects and the distance between them |
| What causes an object to have high/low gravity? | High-Large amount of mass of either object; closer together Low-Small amount of mass of either object; farther apart |
| Up/Down | Up-Always away from the center of the Earth Down-Always toward the center of the Earth |
| How does gravity affect up/down? | Gravity pulls you toward the center of the earth and that's how up and down are determined |
| Where does gravity pull an object? | Toward the center of Earth |
| How strong is gravity? | The strength of gravity depends on how close the two objects are and the amount of mass each of them have |
| What is the formula for finding weight? | w=mg |
| What causes an object to have weight? | The Earth is pulling you down, even if you're not falling |
| Weightlessness | When there is no gravitational force on an object |
| Newton's 2nd Law of Motion | a=Fnet/m |
| How does gravity pull on different objects? | It exerts a force on all objects. |
| Why does a rock fall faster than paper? | Paper has less mass than a rock, which causes it to have more air resistance and fall slower. |
| How does Newton's 3rd Law of Motion affect how objects move? | When one object exerts a force on a second object, the second exerts a force on the first that's equal in strength and opposite in direction. |
| What is an example of Newton's 3rd Law of Motion? | 2 skaters exert forces on each other that are equal in strength and opposite in direction |
| What is the formula for finding momentum? | p=mv |
| How does a rocket move? | When the mass decreases, the acceleration increases |
| What causes objects to orbit other objects in space? | Gravity |
| Explain how to work a math problem for Newton's 2nd Law. | acceleration= Net Force(in newtons)/Mass(in kilograms) |
| Explain how to work a math problem for weight. | weight=mass(kilograms) x acceleration of gravity (meters per second squared) |
| Explain how to work a math problem for momentum. | momentum(kilograms meters per second)=mass(in kilograms) x velocity(in meters per second) |
Created by:
Dancer24016
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