Whenever a net force acts on an object, there is a change in the objects |
Velocity |

The direction of the force of friction on a sliding crate is |
Opposite to the direction of sliding |

The unit of mass is the kilogram and the unit of weight is |
The newton |

Part A: An object cannot remain at rest unless which of the following holds? |
The net force acting on it is zero |

Part B: If a block is moving to the left at a constant velocity, what can one conclude? |
The net force applied to the block is zero |

Part C: A block of mass 2 kg is acted upon by two forces: 3N (directed to the left) and 4N (directed to the right). What can you say about the block’s motion? |
It could be moving to the left, moving to the right, or be instantaneously at rest. |

Part D: A massive block is being pulled along a horizontal frictionless surface by a constant horizontal force. The block must be |
Moving with continuously increasing acceleration |

Part E: Two forces, of magnitude 4N and 10N, are applied to an object. The relative direction of the forces is unknown. The net force acting on an object |
Cannot have a magnitude equal to 5 N. |

Two objects of the same size, but unequal weights are dropped from a tall tower. Taking air resistance into consideration, the object to hit the ground first will be the |
Heavier object |

A light woman and a heavy man jump from an airplane at the same time and open their same size parachutes at the same time. Which person will get to a state of zero acceleration first? |
The light woman |

A 10 kg brick and a 1 kg book are dropped in a vacuum. The force of gravity on the 10 kg brick is |
10 times as much |

An object is propelled along a straight line path by force. If the net force were doubled, the objects acceleration would be |
Twice as much |

An object is propelled along a straight line path in space by a force. If the mass of the object somehow becomes twice as much, its acceleration |
Halves |

An object is pulled northward by a force of 10 N and at the same time another force of 15 N pulls it southward. The magnitude of the resultant force on the object is |
5 N |

The force of friction on a sliding object is 10 N. The applied force needed to maintain a constant velocity is |
10 N |

A 10 N falling object encounters 4 N of air resistance. The net force on the object is |
6 N |

An apple at rest weighs 1 N. The net force on the apple when it is in free fall is |
1 N |

Which has zero acceleration? An object |
-In mechanical equilibrium -At rest -Moving at constant velocity |

Whenever the net force on an object is zero, its acceleration |
Is zero |

The mass of a pet turtle that weighs 10 N is |
About 1 kg |

An object following a straight line path at constant speed |
Has zero acceleration |

A man weighing 800N stands at rest on two bathroom scales so that has weight is distributed evenly over both scales. The reading on each scale is |
400 N |

A rock is thrown vertically into the air. At the very top of its path, its acceleration in meters per second per second is |
9.8 |

An astronaut on another planet drops a 1 kg rock from rest and finds that it falls a vertical distance of 2.5 meters in one second. On this planet, the rock has a weight of |
5 N |

If and object of constant mass experiences a constant net force, it will have a constant |
Acceleration |

The newton is a unit of |
Force |

A 10 N falling object encounters 10 N of air resistance. The net force on the object is |
0 N |

Since an object weighs less on the surface of the moon than on Earths surface does it have less inertia on the moons surface? |
No |

An objects weight may properly be expressed in units of |
Newtons |

When a falling object has reached its terminal velocity, its acceleration is |
Zero |

A kilogram is a measure of an objects |
Mass |

A force is a vector quantity because it has both |
Magnitude and direction |

Your weight is |
The gravitational attraction force between you and the earth |

If an objects mass is decreasing while a constant force is applied to the object, the acceleration |
Increases |

A 1 kg mass at the Earths surface weighs |
9.8 N |

Neglecting friction, a large block of ice and small block of ice start sliding down an incline together. The heavier block will get to the bottom |
At the same time as the light block |

A push on a 1 kg brick accelerates it. Neglecting friction, to equally accelerate a 10 kg brick, one would have to push with |
10 times as much force |

# CHAPTER 4 (PHYSICS)

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