Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

IPS > motion. force. newton's laws of motion. > Flashcards

motion. force. newton's laws of motion. Flashcards

1
Q

True or False?

You don’t have to see something move to know that it has moved.

A

TRUE

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

How can you tell that something has moved even though you didn’t see it move?

A

Reference point(s)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Motion definition

A

When an object changes its position relative to a reference point.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

How do you calculate speed?

A

speed = distance/time

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

The motion of an object depends on the _________ _____ that is chosen.

A

reference point

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Distance def

A

How far it has moved according to its reference point.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

SI unit for distance

A

meter

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

A runner jogs 50 meters. Then they turn around and run back to the 20 meter mark.

total distance ran = ?
displacement = ?

A

total distance ran = 80 meters

displacement = 20 meters

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What is force?

A

A push or pull

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Are the effects of force always noticeable?

A

No. Sometimes it is obvious that force has been applied, but other forces are not always noticeable.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

What can cause the motion of an object to change?

A

a force

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

An example of Changing Motion

A

Playing Pool

  • you can force a ball at rest to roll into a pocket by striking it with another ball
  • the force of the moving the ball causes the ball at ret to move in the direction of the force
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

How is net force created?

A

When two or more forces act on an object at the same time, the forces combine to form the NET FORCE.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

What is net force?

A

the sum of all of the forces acting on an object

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

True or False?

The combining forces can only be balanced forces.

A

FALSE

The combining forces can either by unbalanced or balanced forces. —–> + –> = ——->

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Why do forces follow the same addition rules as displacement?

A

Because they have direction

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

Do you add or subtract forces going in the SAME direction?

A

Add

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

Do you add or subtract forces going in the OPPOSITE directions?

A

SUBTRACT

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

True of False?

Forces going in opposite directions CAN be added together?

A

FALSE

forces NOT in the SAME direction (so opposite) CANNOT be added together.

20
Q

What is the SI unit for force?

A

newtons (N)

21
Q

What is an example of force being used to move something that might be 3 N to move at a constant speed.

A

It takes 3 Newtons of force to lift a can of soda at a constant speed.

22
Q

Think of Mrs. McMahon arm wrestling Isaiah, and say Isaiah won. One clearly is stronger than the other. Describe the net force between the two forces (unbalanced).

A

The net force that pushes the arm down is the difference between the two forces because they are in opposite directions. Because the net force is NOT zero, movement occurred. Mrs.M = net force —>

23
Q

True or False?

Unbalanced forces can never be in the same direction.

A

FALSE

Unbalanced forces CAN be in the SAME direction.

24
Q

What would be an example of unbalanced forces at work?

A

Example:
Imagine two people working together to push a vehicle that has run out of gas to a gas station.

The weight of the car that is opposing them is not enough to balance their combined effort, thus this is UNBALANCED.

They are pushing in the same direction, SO the forces can be ADDED to get the NET FORCE.

AGAIN movement OCCURS *SOOOO the net force is NOT ZERO.

25
Q

Think Mrs. McMahon vs Mrs. McMahon in an arm wrestling match. What would be happening with these forces?

A

These forces would cancel each other out.

26
Q

True or False?

Forces on an object that are EQUAL in size and OPPOSITE in direction are called UNBALANCED forces?

A

FALSE

Forces on an object are equal in size and opposite in direction are called BALANCED forces.

27
Q

What is the net force if no movement occurs?

A

zero

28
Q

What is an example of friction?

A

Ex:

The star soccer player kicks a ball and isn’t touched by any other players or objects.

29
Q

Take the example of friction:
(The star soccer player kicks a ball and isn’t touched by any other players or objects)

  • will it keep moving with a constant speed forever?
A

No.

The force that slows the ball and brings it to a stop if friction.

30
Q

Friction def

A

the force that opposes the sliding motion of two surfaces that are touching each other

31
Q

What does the amount of friction between two surfaces depend on?

(two things)

A
  1. the KIND/TYPE of surface(s)

2. the force pressing the surfaces together

32
Q

How/ Why does friction occur?

5 things

A

• microwelds
- ALL surfaces have bumps and dips

If two surfaces are in contact, wielding or sticking occurs where the bumps touch each other

At these sticking points, MICRO-WELDS are formed

The LARGER the force pushing the two surfaces together is, the stronger these micro-weld will be BECAUSE more of the surface bumps will come into contact

For one surface to move over another, a FORCE must be applied to BREAK the microwelds

33
Q

STATIC Friction def

A

the friction that PREVENTS movement BEFORE it starts

34
Q

Think of an example of STATIC friction

A

Ex:
Suppose you have filled a cardboard box with books and you want to move it. It’s too heavy to lift, so you start pushing on I️, but it’s doesn’t budge.

35
Q

What is happening in the example of static friction?

A
  • the box is experiencing no change in motion SO the net force on the box is zero
  • the applied force was CANCELED out by friction
  • this is STATIC FRICTION
36
Q

Why does static friction prevent two surfaces from sliding past each other?

A

This is due to the microwelds that have formed between the bottom of the box and the floor

If your push is not large enough to break, the microwelds, the box will not move

37
Q

SLIDING Friction def

A

the friction that opposes movement while it’s happening

38
Q

What is an example of SLIDING friction?

A

Ex:
Suppose you get a friend to help you move the previously mention box (in static friction). Together, you have exerted enough force to BREAK the micro-welds and the box moves!

39
Q

What is the net force if something moves (vague)

*like in SLIDING friction example

A

NOT zero

40
Q

Why must you continually move the box in the SLIDING friction example?

A

because the SLIDING Friction opposes the motion of the box as the box slides across the floor

41
Q

True or False?

SLIDING friction opposes the motion of 2 surfaces sliding past each other BEFORE it happens.

A

FALSE

It opposes WHILE it is happening

42
Q

Why does the sliding friction oppose the motion of 2 surfaces sliding past each other?

A

Because the micro-welds are constantly BREAKING and FORMING as the objects slide past each other.

43
Q

ROLLING Friction def

A

the friction that PREVENTS slipping DURING movement

44
Q

Give and example if ROLLING friction

A

Ex:
As wheel roll over a surface static friction acts over the area where the wheel and surface touch PREVENTING the wheel from SLIPPING

*called ROLLING friction

45
Q

What is ROLLING friction called when referring to tires on vehicles?

A

traction

46
Q

Name the four basic forces

A
  1. Gravity
  2. Electromagnet force
  3. STRONG nuclear force
  4. WEAK nuclear force

IPS (3 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions