Chapter 4

Question 1

What is newton’s first law?

Answer 1

Any object in motion will remain in motion till a force is applied

Question 2

What is Newton’s 2nd law?

Answer 2

F=ma

Question 3

What is Newton’s 3rd law?

Answer 3

For every force applied there is an equal but opposite force

Question 4

Weight is what?

Answer 4

mass x gravity

Question 5

Equation for gravitational force

Answer 5

F(grav)= G Mm/r^2 (g=GM/r^2)

Question 6

Equation for kinetic friction

Answer 6

F(f)=M(k) F(N)

Question 7

Equation for static force

Answer 7

F(f)max= M(s)F(N)

Question 8

The direction of force is _________ to the direction of motion

Answer 8

Opposite

Question 9

Force due to gravity is parallel to inclined plane where its _______

Answer 9

mgsindelta

Question 10

Force due to gravity acting perpendicular to inclined plane is ________

Answer 10

mgcosdelta

Question 11

An object will accelerate in the direction of the __________ it feels but that does not mean that it will always move in the direction of Fnet

Answer 11

Fnet

Question 12

When Fnet = 0 then a = ?

Answer 12

Zero (so an object’s velocity doesn’t change)

Question 13

When Fnet = 0 then a = ?

Answer 13

Zero (so an object’s velocity doesn’t change but doesn’t mean the velocity is zero just means that an object wont accelerate)

Question 14

What is the equation relating weight & gravitational force?

Answer 14

g=G M/ r^2

Question 15

Rolling Resistance

Answer 15

Its the force that resist an object’s rolling motion, an object can roll without sliding or skidding so any friction at the contact point between the two object and the surface will be static not kinetic

Question 16

The ________ is the perpendicular component of the contact force exerted by a surface on an object

Answer 16

normal force

Question 17

Pulley systems (the traditional ones) usually _________ the force by however many strings are pulling on the object

Answer 17

Multiply