static questions

Question 1

how does netwons 1st law of motion relate to Galileos concept of inertia

Answer 1

newtons law is a restatement of galileos concept of inertia

Question 2

what is the net force on a cart that is pulled to the right with 100 pounds of force and to the left with 30 pounds of force

Answer 2

70 pounds to the right

Question 3

why do we say force is a vector quantity?

Answer 3

the diagonal of a parallelogram represents the resultant of the vector pair

Question 4

what does it mean to say something is in mechanical equilbrium

Answer 4

all the forces on something in mechanical equilibrium add vertically to zero

Question 5

consider a book weighs 15 N at rest on a flat table. How many netwons of support force does this table provide? what is the net force?

Answer 5

support is 15 and net force is 0

Question 6

a bowling ball at rest is in equilibrium when it moves at constant speed in a straight-line path

Answer 6

yes, the ball moving at constant speed is a straight line is in dynamic equilibrium

Question 7

if you push on a crate with a force of 100 N and it slides at constant velocuty, how great is the friction acting on the crate?

Answer 7

the force of friction is 100 N