PHYS 1010Q Lecture Notes - Lecture 6: Net Force, Massachusetts Route 2

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18 Sep 2017

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Phys-1010q - lecture 6 - momentum & energy (ch. 6 (pp59-65) & ch 5) If the(cid:396)e"s (cid:374)o e(cid:454)te(cid:396)(cid:374)al fo(cid:396)(cid:272)es o(cid:374) a(cid:374) o(cid:271)je(cid:272)t, that o(cid:271)je(cid:272)t (cid:373)o(cid:448)es i(cid:374) a (cid:272)o(cid:374)sta(cid:374)t state of motion. Whatever forces that are acting on an object balance each other out. The acceleration of an object is equal to the net force on it divided by the mass. (cid:862)whe(cid:374)e(cid:448)e(cid:396) o(cid:374)e o(cid:271)je(cid:272)t e(cid:454)e(cid:396)ts a force on a second object, the second object exerts an e(cid:395)ual a(cid:374)d opposite fo(cid:396)(cid:272)e (cid:271)a(cid:272)k o(cid:374) the fi(cid:396)st. (cid:863) o(cid:374)e fo(cid:396)(cid:272)e is (cid:272)alled the a(cid:272)tio(cid:374) fo(cid:396)(cid:272)e a(cid:374)d the other the reaction force. They are pairs of a single interaction and neither force exits without the other. Note the action and reaction forces act on different objects and not the same object. Fa - force on object a due to object b. Fb - force on object b due to object a. Describe the reaction force in the following examples: Reaction: string pulls back on the man.

Related Questions

Select the one that is not one of Newton's Law of motion.

A) equal and opposite reaction force acts for each action.

B) An object in uniform motion in the absence of external force continues to move in the same direction.

C) Rate of change of momentum is equal to the net force applied

D) The body has some masses attract each other with a constant force.

1) An object is moving with constant velocity. Which of thefollowing statements is true?
a) A constant force is being applied in the direction ofmotion.
b) A constant force is being applied in the direction opposite ofmotion.
c) There are no forces acting on the object.
d) The net force on the object is zero.
e) There is no frictional force acting on the object.

2) You apply the same force to two objects. Object 1 has mass M andobject 2 has mass 5M.
a) ten times that of object 1 b) five times that of object 1
c) the same as that of object 1 d) 1/5 as that of object 1

3) An object of weight W is in free-fall close to the surface ofEarth. What is the force that the object exerts on Earth?
a) a force greater than W b) a force less than W
c) a force equal to W d) no force at all

4) A parking crate slides down an inclined ramp at constantvelocity. Thus we can deduce that _
a) a frictional force is acting on it
b) a net downward force is acting on it
c) a net upward force is acting on it
d) it is not acted on by appreciable normal force
e) it is not acted on by appreciable gravitational force

5) A person applies a constant force of 20N to a rock of mass1000kg for a total of 20 seconds. What is the work done by thisperson if the person does not move at all by this appliedforce?
a) 1000J b) 2000J c) 20,000J d) 0J e) 400J

6) If the net work done on an object is positive, then theobject's kinetic energy.
a) decreases b) remains the same c) increases d) is zero

7) You throw a ball straight up. Compare the sign of the workdone by gravity while the ball goes up with the sign of the workdone by gravity while it goes down.
a) Work is + on the way up and + on the way down
b) Work is + on the way up and - on the way down
c) Work is - on the way up and + on the way down
d) Work is - on the way up and - on the way down

1) An object is moving with constant velocity. Which of the following statements is true?
a) A constant force is being applied in the direction of motion.
b) A constant force is being applied in the direction opposite of motion.
c) There are no forces acting on the object.
d) The net force on the object is zero.
e) There is no frictional force acting on the object.

2) You apply the same force to two objects. Object 1 has mass M and object 2 has mass 5M. The acceleration is
a) ten times that of object 1 b) five times that of object 1
c) the same as that of object 1 d) 1/5 as that of object 1

3) An object of weight W is in free-fall close to the surface of Earth. What is the force that the object exerts on Earth?
a) a force greater than W b) a force less than W
c) a force equal to W d) no force at all

4) A parking crate slides down an inclined ramp at constant velocity. Thus we can deduce that _
a) a frictional force is acting on it
b) a net downward force is acting on it
c) a net upward force is acting on it
d) it is not acted on by appreciable normal force
e) it is not acted on by appreciable gravitational force

5) A person applies a constant force of 20N to a rock of mass 1000kg for a total of 20 seconds. What is the work done by this person if the person does not move at all by this applied force?
a) 1000J b) 2000J c) 20,000J d) 0J e) 400J

6) If the net work done on an object is positive, then the object's kinetic energy.
a) decreases b) remains the same c) increases d) is zero

7) You throw a ball straight up. Compare the sign of the work done by gravity while the ball goes up with the sign of the work done by gravity while it goes down.
a) Work is + on the way up and + on the way down
b) Work is + on the way up and - on the way down
c) Work is - on the way up and + on the way down
d) Work is - on the way up and - on the way down

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PHYS 1010Q Lecture Notes - Lecture 6: Net Force, Massachusetts Route 2

PHYS 1010Q Full Course Notes

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Physics: Principles with Applications

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