Unit 3- Forces

Question 1

Forces are represented by _____

Answer 1

Vectors

Question 2

The overall force acting on an object after all forces are combined

Answer 2

Net Force

Question 3

Forces are measures in ______

Answer 3

Newtons (N)

Question 4

1 Newton represents….

Answer 4

1 kg x 1m/s^2

Question 5

Forces are measured using a…..

Answer 5

spring scale

Question 6

Forces that are opposite in direction and equal in size

Answer 6

Balanced force

Question 7

Net force of balanced forces

Answer 7

0

Question 8

The net force is NOT 0 in an….

Answer 8

unbalanced force

Question 9

in which an object changes speed, direction, or both

Answer 9

acceleration

Question 10

Force that opposes motion between 2 surfaces when they are in contact

Answer 10

Friction

Question 11

Rough surfaces have (more, less) friction

Answer 11

more

Question 12

more force= (more, less) friction

Answer 12

more

Question 13

Force that keeps an object at rest

Answer 13

static friction

Question 14

force that opposes the motion of an object as it slides over a surface

Answer 14

sliding friction

Question 15

force that acts on rolling objects

Answer 15

rolling friction

Question 16

force that opposes the motion of an object through a fluid (liquids & gases)

Answer 16

fluid friction

Question 17

Gravity causes objects to accelerate ______

Answer 17

Downward

Question 18

______ opposes the force of gravity

Answer 18

Air resistance

Question 19

Acceleration of any object (without air resistance) on Earth

Answer 19

9.8 m/s^2

Question 20

Falling faster (increases, decreases) air resistance

Answer 20

increases

Question 21

the point at which gravity = air resistance

Answer 21

terminal velocity

Question 22

Terminal velocity depends on ____, _____, and _____ of the object

Answer 22

size, shape, mass

Question 23

force of attraction between any 2 objects in the universe

Answer 23

force of gravity

Question 24

force of gravity increases as mass (increases, decreases) and distance (increases, decreases)

Answer 24

increases, decreases

Question 25

The amount of matter in an object

Answer 25

Mass

Question 26

Force of gravity acting on an object

Answer 26

Weight

Question 27

Newton’s First Law

Answer 27

an object at rest will stay at rest and an object in motion will stay in motion unless acted upon by a force

Question 28

The tendency of an object to resist any change in motion

Answer 28

Inertia

Question 29

Newton’s Second Law

Answer 29

F=ma

Force= mass x acceleration

Question 30

Newton’s 3rd Law

Answer 30

When an object exerts a force on a second object, the second object exerts an equal but opposite force on the first.

Question 31

Quantity of motion that is dependent in both mass and velocity

Answer 31

Momentum

Question 32

Formula for Momentum

Answer 32

p=mv

p=momentum
m=mass
v=velocity

Question 33

The total momentum in a group of objects does not change unless outside forces act on the objects

Answer 33

Law of Conservation of Momentum

Question 34

A push or a pull that one object exerts on another

Answer 34

Force