Unit 2

Question 1

Newton’s Ist Law

Answer 1

(the law of Inertia): An object at rest tends to stay at rest and an object in motion tends to stay in motion unless acted upon by an unbalanced force.

Question 2

Inertia

Answer 2

The tendency of an object to resist changes to its state of motion.

Question 3

Newtons 2nd Law

Answer 3

The acceleration of an object is produced by a net force acting an it.

The acceleration is proportional to the net force acting

The acceleration is inversely proportional to the mass

Question 4

Newtons Third Law

Answer 4

for every action there is an equal and opposite reaction

forces come in pairs

Question 5

Net force and acceleration always go the ——- direction.

Answer 5

Same

Question 6

Fnormal is the —————- force of the ground on an object

Answer 6

Perpendicular

Question 7

Balanced Systems: FNET = _ N
a = _ m/s^2

Answer 7

0

0

Question 8

Mass

Answer 8

the amount of matter (particles) in an obiect, measured in kg. Mass does not vary

Question 9

Mass

Answer 9

the amount of matter (particles) in an obiect, measured in kg. Mass does not vary

Question 10

Weight

Answer 10

the gravitational force acting on an object due to its location in a gravitational field, measured in N.

Weight is dependent upon location.

Question 11

Gravitational field strength

Answer 11

g = 9.8 m/s^2

Question 12

Gravitational field strength

Answer 12

g = 9.8 m/s^2

Question 13

You feel ________ as Fnet is smaller

Answer 13

Lighter

Question 14

You feel ________ as Fnet is larger

Answer 14

Heavier

Question 15

When moving up (positive) the normal force is

Answer 15

N = ma + mg

Question 16

when moving down (negative) the normal force is

Answer 16

N= mg - ma

Question 17

The normal force is called the object’s _____ ________

Answer 17

apparent weight.

Question 18

Apparent weight =

Answer 18

mass times gravity

Question 19

Changes to apparent weight:
• Normal weight:

Answer 19

Acceleration = 0

Question 20

Changes to apparent weight:
When Greater than normal weight:

Answer 20

Acceleration upward

Question 21

Changes to apparent weight:
• Less than normal weight

Answer 21

Acceleration down

Question 22

Changes to apparent weight

• Zero weight:

Answer 22

Acceleration = gravity

Question 23

Gravitational Mass

Answer 23

Measured by comparing the force of gravity of an unknown mass to the force of gravity of a known mass. This is typically done with some sort of balance scale.

Question 24

Inertial Mass

Answer 24

found by applying a known force to an unknown mass, measuring the acceleration, and applying Newton’s 2nd law (F = ma)