AST101H1 Lecture : chapter 4

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sangriareindeer116

16 Feb 2011

School

UTSG

Department

Astronomy & Astrophysics

Course

AST101H1

Professor

Clifford Orwin

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AST101H1 Full Course Notes

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But mass also plays a role a person pushing a bike with a child riding=bike will move faster a person pushing a bike with an adult riding=bike moving much slower. Newtons 2nd law of motion affects momentum becuse: since an unbalanced force causes acceleration, which is a change in velocity, then force also changes momentum. 3rd law----forces act in equal and opposing pairs you push down on the ground when u walk and the ground pushes up towards your feet. 3 basic terms on how an object is moving. 1)speed- how far a car will go in a certain time (100km/hr) 3)acceleration- if the speed or direction change (slowing speed or change in direction is negative acceleration. Galileo- demonstrated that gravity accelerates all objects by the same amount regardless of their mass. Acceleration of gravity- acceleration of falling objects (g) *earth acceleration for falling objects is 10m/s* www. notesolution. com. An objects momentum is the product of its mass and velocity (momentum=mass*velocity)

Related Questions

an unbalanced force of 150lbs. acts on a body whose weight isits acceleration ?

An applied force of 4.5 N acts on a 1.5 kg blaster, pushing it horizontally across a surface where the coefficient of kinetic friction is 0.15. (g=9.81 m/s²)

a. determine the frictional force acting

b. determine the object's acceleration

pinkbat910

1. Which of the following describes an object with a non-zero netforce acting on it? Choose all that apply.
The moped accelerated while making a left turn.
The motorcycle traveled at a constant speed while making au-turn.
The truck slowed down while making a right turn.
The spaceship traveled at a constant speed in a straightline.
The car sped up from 50 mph to 65 mph while moving in a straightline.

2. If you observe that an object is accelerating, what should youconclude?
A non-zero net force is acting on it. Only forces causeacceleration. As such, if an object is accelerating it must bebecause a non-zero net force is acting on it.
It must be in free fall.
It must be changing direction. Acceleration is a vector and vectorshave both magnitude and direction. Thus if an object isaccelerating it must be changing direction.
The forces acting on the object must be greater than the forces theobject is exerting.
It must be speeding up. If an object is accelerating that means itis speeding up.

3. Which of the following are true according to Newton's 2nd Law?Choose all that apply.

If the acceleration is zero, then the net force is zero.
If you apply the same force to 2 objects, the one with more masswill have a greater acceleration.
If you apply the same force to 2 objects, the one with less masswill have a greater acceleration.
If two objects have the same acceleration, the one with less masswill have a larger net force exerted on it.
If two objects have the same acceleration, the one with more masswill have a larger net force exerted on it.
The larger the net force on an object is, the larger theacceleration.
The larger the net force on an object is, the smaller theacceleration.

4. A box is on the Moon. The box weighs 152 lb and is in free fall.How much force is the box exerting on the Moon and in whatdirection?

lb
Up
Down
Right
North
East
West
Left
South

5. Which of the following are the correct units for mass? Chooseall that apply.
slugs
u
kgÂ·m/s2
g
N
m/s2
oz
lb

6. If an object is traveling in a circle, which of the followingmust be TRUE? Choose all that apply.
The object is slowing down.
The object is speeding up.
The object has a net force acting on it.
The object has a constant velocity.
The object is accelerating.

AST101H1 Lecture : chapter 4

AST101H1 Full Course Notes

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