Science Force

Question 1

Force

Answer 1

A push or a pull

Question 2

Net force

Answer 2

the combination of all forces acting on a object

Question 3

Force is described by

Answer 3

Its strength and by the direction in which it acts

Question 4

SI units for force

Answer 4

Newtons

Question 5

Formula for force

Answer 5

F= M x A

Question 6

1N = ___ kg x ____ m/s/s

Answer 6

????

Question 7

What do scientist use to represent a force?

Answer 7

F or an arrow

Question 8

The device you used to measure force with your shoe

Answer 8

Spring scale

Question 9

What are balanced forces?

Give example

Answer 9

When two equal forces act in opposite directions to cancel each other out.
Two people pushing on a box across from each other and the box does not move

Question 10

What are unbalanced forces?

Give example

Answer 10

Forces acting on an object result in a change in motion

You and Laura pushing against each other on a box

Question 11

Newton’s 3 Laws of Motion

Answer 11

1. Object at rest will remain at rest. Object in motion will stay in motion
2. Acceleration depends on the objects mass and on the net force acting on the object (A= F/M)
3. For every action there is an equal and opposite reaction

Question 12

Inertia

Answer 12

tendency to resist change in motion

Question 13

SI units for mass

Answer 13

kg

Question 14

SI units for velocity

Answer 14

m/s

Question 15

Calculate Acceleration

Answer 15

A = F / M

Question 16

How can you change the acceleration of an object?

Answer 16

Change the force used to move it. (Push or pull harder or lighter)

Question 17

Friction

Answer 17

Force that two surfaces exert on each other when they rub against each other

Question 18

Rolling friction definition

give an example

Answer 18

when an object rolls across a surface

skateboard, bike, tires

Question 19

Sliding Friction Definition

give example

Answer 19

When two solids surfaces slide over each other.

Sand on ice to keep from falling, brake pad on tires, your skin on concrete when you crash bike

Question 20

Fluid friction definition

Give example

Answer 20

Occurs when solid moves through a liquid.

Surf board, water ski, bike helmet with air

Question 21

Static Friction

Give example

Answer 21

Friction that acts on objects that are not moving.

Pushing heavy desk that wont move

Question 22

Four types of friction

Answer 22

1. Fluid
2. Rolling
3. Sliding
4. Static

Question 23

Weight

Answer 23

Force of gravity on a person or object at the surface of a planet

Question 24

Mass

Answer 24

measure of the amount of matter in an object

Question 25

Acceleration due to gravity

Answer 25

9.8 m / s*s

Question 26

Terminal velocity

Answer 26

the greatest velocity a falling object reaches

Question 27

Air resistance

Answer 27

Fluid friction that objects experience falling through the air. Remember that air resistance is an upward force on an object falling down

Question 28

Free fall

Answer 28

When the only force on an object is gravity

Question 29

Law of Universal Gravitation

Answer 29

The force of gravity acts between all objects in the universe. Gravity acts everywhere not just on Earth.

Question 30

Convert a weight into Newtons

Answer 30

1 lb = .45kg (1N=.224lbs)

Question 31

Formula for momentum

Answer 31

Momentum = mass x velocity

Question 32

Law of Conservation of Momentum

Answer 32

In the absence of outside forces - the total momentum of objects that interact does not change. The amount of momentum is the same before and after they interact

Question 33

Example of outside force

Answer 33

Friction

Question 34

Which of Newton's Laws explains how a rocket lifts off?

Answer 34

Gas force exerts an equal but opposite reaction force on the rocket (Newtowns 3rd law)

Question 35

What is a satellite

Answer 35

Any object that orbits another object in space

Question 36

Name a natural satellite

Answer 36

asteroid

Question 37

Three purposes of artificial satellites

Answer 37

1. Communication 2. Weather analysis 3. GPS

Question 38

Name the artificial satellite for scientific research?

Answer 38

International Space Station

Question 39

What two forces act on satellites?

Answer 39

1. Centripetal force | 2. Gravitational force

Question 40

When an unbalanced force acts on an object the force

Answer 40

changes the motion of the object

Question 41

Air resistance is what type of friction?

Answer 41

Fluid friction

Question 42

Which of the following is not a projectile? | satellite, thrown ball, ball on the ground, soaring arrow

Answer 42

ball on the ground

Question 43

The resistance of an object to any change in its motion is called

Answer 43

inertia

Question 44

The product of an objects mass and its velocity is called the object's

Answer 44

momentum

Question 45

T/F | Balanced forces are equal forces acting on an object in opposite directions

Answer 45

True

Question 46

T/F | Rolling friction occurs when two solid surfaces slide over each other

Answer 46

True

Question 47

T/F | The greatest velocity a falling object reaches is called its momentum

Answer 47

False | Its Terminal Velocity

Question 48

T/F | The law of universal gravitation states that the total momentum of objects that interact does not change

Answer 48

Universal law of momentum

Question 49

T/F | The type of force that causes a satellite to orbit earth is a centripetal force

Answer 49

True

Question 50

``` Type Occurs Example of Friction When static sliding rolling fluid ```

Answer 50

static object not moving pushing heavydesk sliding two against other skin wrecking bike rolling one rolls against other skateboard fluid solid thru liquid bike helmet air or ski