unit 1

Question 1

if you are passed by a sports car on a highway (both going a constant speed) explain position, velocity,a dn acceleration

Answer 1

acceleration = 0 (constant speeed)
velocity = cports car is faster
position (same)

Question 2

how to find the velocity on and accelration curve

Answer 2

integrate

Question 3

finding position on a velocity curve

Answer 3

integrate

Question 4

a crate is pushed from rest on a rope with a varying force to a point where it is above the ground. what is the work on the system

Answer 4

the system starts at rest and ends at rest so the net work is 0

Question 5

when a crate is pushed upwards pivoting like a pendulum on a rope, how much work does the rope do on the system,

Answer 5

the rope applies force constantly in the direction perpendicular to the motion so the net work is 0

Question 6

an archer is at rest and then shoots. he moves back, what net is increased for the system

Answer 6

the net kinetic energy increases for the system, as nothing was moving but now it was.

Question 7

a cart is rolling on a hilly land. at t1 the cart is at h0 later at t2 v is increased. thusly

Answer 7

h2 must be lower than h0

Question 8

you drop a bowl on a carpet and it doesn’t break but you drop the same bowl on concrete and it breaks what is different

Answer 8

the time length of the colision

Question 9

you drop a ball and it falls to the ground. the work done by gravity is

Answer 9

positive because it is int eh direction of motion