physics 15 Q Newtons Laws

Define Acceleration?

a change in velocity... the rate at which velocity changes.... increasing speed, decreasing speed, or changing direction

What is force?

a push or a pull on an object

Define Newton's 1st Law?

an object at rest tends to stay at rest. an object in motion tends to stay in motion in a straight line at a constant speed until another force acts on the object

What is Newton's Third Law?

for every action there is an equal and opposite reaction

Increased mass=?

lower acceleration

What are the two things that affect acceleration

mass and force

What does Deceleration mean?

slowing down

What is Mass?

the amount of matter in an object

Define Speed?

the distance an object travels per unit of time

Define Inertia?

the tendency for an object to resist a chance in motion

Average speed formula=?

total distance/total time

Consider Newton's first law of motion to determine which of the following statements are true? List all that apply. Newton's first law of motion is applicable to both moving and nonmoving objects. If a football is moving upwards and rightwards towards the peak of its trajectory, then there are both rightwards and upwards forces acting upon it. It would take an unbalanced force to keep an object in motion. If an object is at rest, then there are no forces acting upon the object. It would take an unbalanced force to keep an object in motion at a constant velocity. It is the natural tendency of all objects to eventually come to a rest position. It would take an unbalanced force to cause an object to accelerate from rest.

AF

Which of the following statements are true of the quantity mass? List all that apply. The mass of an object is dependent upon the value of the acceleration of gravity. The standard metric unit of mass is the kilogram. Mass depends on how much stuff is present in an object. The mass of an object is variable and dependent upon its location. An object would have more mass on Mount Everest than the same object in the middle of Lake Michigan. People in Weight Watcher's are really concerned about their mass (their mass watchers). The mass of an object can be measured in pounds. If all other variables are equal, then an object with a greater mass would have a more difficult time accelerating. The mass of an object is mathematically related to the weight of the object.

BCF HIJ

Which of the following statements are true of inertia? List all that apply.(hint there is only two) a)Inertia is a force. b)Inertia is a force which keeps stationary objects at rest and moving objects in motion at constant velocity. c)Inertia is a force which brings all objects to a rest position. d)All objects have inertia. e)A more massive object has more inertia than a less massive object.

D,E

Which of the following statements are true of an object that experiences balanced forces (or unbalanced forces)? List all that apply. If a person is moving to the right, then the forces acting upon it are NOT balanced. A balance of forces is demonstrated by an object which is slowing to a stop. It would take an unbalanced force to keep an object in motion. If an object is moving with a constant speed in a circle, then the forces acting upon the object are balanced. If a person is moving to the right, then the forces acting upon it are NOT balanced. A balance of forces is demonstrated by an object which is slowing to a stop. It would take an unbalanced force to keep an object in motion. If an object is moving with a constant speed in a circle, then the forces acting upon the object are balanced. jects to remain at rest and moving objects to come to rest. Unbalanced forces cause objects to move.

None of these are true, though one might make a strong argument for A.