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# Forces (Part I) Quiz

### Forces Quiz (3/5)

Question | Answer |
---|---|

Any push or pull on any object | Force |

A force has ________ and _________. | Strength; direction |

What tool is used to measure forces? | Springscale |

What is the unit used for forces? | Newtons (N) |

What are some types of forces? (Name the 4 we went over in class in alphabetical order) | Applied, friction, gravity, normal |

The overall force on an object | Net force |

To calculate a net force, forces in the same direction should be _________ (added, subtracted) | Added |

To calculate a net force, forces in the opposite directions should be _________ (added, subtracted) | Subtracted |

What step is missing from the steps to measuring force using a spring scale? 1. Zero-out scale 2. Determine scale 3. Take measurement 4. ____ _____ | Team check |

Shows all forces acting on an object | Force diagram |

What is the force of object with the following forces acting on it: 20N to the right, 20N to the right | 40N to the right |

What is the force of object with the following forces acting on it: 18N to the right, 16N to the left, 6N to the left | 4N to the left |

What is the force of object with the following forces acting on it: 35N to the right, 5N to the left, 2N to the left, 11N to the right | 39N to the right |

What is the force of object with the following forces acting on it: 15N to the right, 14N to the right, 13N to the right, 42N to the left | 0N |

A nonzero net force (Fnet ≠ 0) that causes an object to accelerate | Unbalanced force |

If a force is unbalanced, then an object that is not moving will __________ (continue to not move, start moving) | Start moving |

If a force is unbalanced, then an object that is moving will ________ (continue to move at the same speed, speed up/slow down/turn) | Speed up/slow down/turn) |

A zero net force (Fnet = 0) that does not cause an object to accelerate. | Balanced force |

If a force is balanced, then an object that is not moving will ________ (continue to not move, start moving) | Continue to not move |

If a force is balanced, then an object that is moving will __________ (continue to move at the same speed, speed up/slow down/turn) | Continue to move at the same speed |

What is the force of object with the following forces acting on it: 8N to the left, 6N to the right | 2N to the left |

What is the force of object with the following forces acting on it: 15N to the left, 11N to the right, 2N up, 2N down | 4N to the left |

What is the force of object with the following forces acting on it: 7N to the left, 5N to the left, 13N up, 21N down, 12N to the right | 8N down |

The amount of matter in an object | Mass |

The force of gravity pulling on an object | Weight |

What is the formula for weight? | Mass * Gravity |

Your mass in Kg = your weight in pounds ÷ ______ | 2.2 |

The gravity on Earth is _____? | 9.8 m/sec^2 |

If Julie weighs 35 lbs (16 Kg), then what is her weight in Newtons? | 156.8N |

How would Julie's weight change if she was on the moon, where Gravity=1.6 m/sec^2) | 25.6N |

A force that opposes motion and slows down moving objects | Friction |

What two factors affect friction? | Texture of surface, normal force |

Rough surface = ________ friction (Stronger, weaker) | Stronger |

Normal force increases = Friction _________ (Increases, decreases) | Increases |

What are the two forms of friction? | Static, kinetic |

Friction on objects that are stationary | Static |

Friction on objects that are moving | Kinetic |

What are the three types of kinetic friction? | Sliding, rolling, fluid |

Type of kinetic friction in which one surface slides over another | Sliding |

Type of kinetic friction in which one surface rolls over another | Rolling |

Type of kinetic friction in which one surface moves through a fluid | Fluid |

Two women are pushing a car that weights 2500 lbs (1140Kg). The woman in blue can push with 200N and the woman in white can push with 250N. The friction between the tires and the ground is 400N. What is the net force? | 50N to the right |

What is the name of this law? The force of gravity acts between all objects in the universe. | Newtons's Law of Universal Gravitation |

The strength of the gravitational force depends on the ______ of objects and the _________ between their centers. | Mass; distances |

The relationship between the force of Gravity, the mass of two objects, and their distance is...? | Fg ≈ (M1 * M2) ÷ d^2 |

Two bricks are left motionless in outer space with nothing else around them. Will there be a gravitational attraction between them? | Yes |

Are you attracted to a mountain located 5 Km (3 miles) away? Why aren't you pulled towards that mountain? | Yes; the force is small |

Are you attracted to the person sitting next to you? | Yes |

As the mass of the objects increases, the gravitational force between the objects ________. | Increases |

If the mass of the objects doubles, then the gravitational force ________. | Doubles |

As the distance between the centers of objects increases, the gravitational force between the objects ___________. | Decreases |

If the distance between the objects doubles, then the gravitational force will be ________. | The inverse of d^2 |

If the distance between the objects triples, then the gravitational force will be _______. | The inverse of d^3 |