Science W3

Question 1

What’s force?

Answer 1

push or pull that acts on an object

Question 2

what’s a newton?

Answer 2

SI Unit of Force. The force that causes a 1kg mass to accelerate at a rate of 1 m/s (meters per second)

Question 3

Net Force

Answer 3

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

Question 4

friction

Answer 4

force that opposes the motion of objects that touch as they move past each other

Question 5

static friction:

Answer 5

friction force that acts on objects that are not moving

Question 6

Sliding Friction

Answer 6

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

Question 7

Rolling Friction

Answer 7

change of shape at the point of rolling contact (friction force that acts on rolling objects)

Question 8

Fluid Friction

Answer 8

Force opposing motion of an object through a fluid

Question 9

air resistance/drag

Answer 9

Fluid Friction acting on an object moving through the air

Question 10

Gravity

Answer 10

a force that acts between any two masses

Question 11

Terminal velocity

Answer 11

force of air resistance is equal to the force of gravity

Question 12

projectile motion

Answer 12

motion of a falling object (projectile) after its given an initial forward velocity

Question 13

when unbalanced forces act on an object, the object

Answer 13

accelerates

Question 14

the four types of friction and put them in order from strongest (most difficult) to weakest (easiest)

Answer 14

1. Static (Strongest)
2. Sliding
3. Rolling
4. Fluid (weakest)

Question 15

What does air resistance do to the acceleration of a falling object

Answer 15

decreases the acceleration over time (opposing force of gravity)

Question 16

What direction does Earth’s gravitational force acts towards?

Answer 16

Vertically Downward (moves towards the center of Earth)

Question 17

What causes a projectile to follow a curved path?

Answer 17

The combination of initial forward velocity and downward vertical force of gravity

Question 18

If an object moves or accelerates it is

Answer 18

an unbalanced force

Question 19

If an object is not accelerating/moving it is

Answer 19

a balanced force

Question 20

a force can cause a resting object to move or it can accelerate a moving object by changing the direction of an object

Answer 20

True

Question 21

Weight is a force

Answer 21

True

Question 22

What speed does Newton cause

Answer 22

1m/s^2 or 1N=1kg times m/s^2

Question 23

Balanced force = always a net force of

Unbalanced force=never equal to

Answer 23

zero, no change so nothing is happening

zero (train decelerating, pushing an object)

Question 24

unbalanced force acts on an object=

Answer 24

object moving

Question 25

forces in same direction= _ opposite direction=_

Answer 25

Add Subtract

Question 26

inertia

Answer 26

the tendency of an object to not move/change its motion

Question 27

Mass

Answer 27

a measure of the inertia of an object, depends on the amount of matter the object has. *measure of inertia* is what to remember

Question 28

weight

Answer 28

measure of the force of gravity acting on an object

Question 29

The motion of an object stays the same if net force acting on the object is zero? T or F

Answer 29

true

Question 30

Acceleration formula (Newtons 2nd law)

Answer 30

Net Force divided by mass or A=F/M

Question 31

Difference between Mass and Weight?

Answer 31

Mass is the measure of intertia of an object while weight is measure of the force of gravity

Question 32

Describe examples of Newtons first and second law that you see every day:

Answer 32

First: A soccer ball rolling and it hits a post, car maintaining speed unless its brakes are used, a book staying still until picked up Second: pushing a cart, kicking a ball, riding a bike, sitting in a car that's speeding up