Brainscape's Knowledge GenomeTM

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


See full index

Physics Additional > Topic 3 - Motion And Forces > Flashcards

Topic 3 - Motion And Forces Flashcards

You may prefer our related Brainscape-certified flashcards:
Physics 101 flashcards AP® Physics flashcards
0
Q

What is speed?

A

How FAST you are going with NO regard to direction

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

What are speed and velocity measured in?

A

m/s(or km/h or mph)

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

What is velocity?

A

How fast you are going WITH regard to direction. The distance in a particular direction is called displacement.

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

What is displacement

A

The distance in a particular direction

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

Velocity and displacement depend on what?

A

SIZE and DIRECTION

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

What is acceleration?

A

How quickly a velocity is changing

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

How is the change in velocity effected?

A

Change in SPEED or change in DIRECTION (or both)

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

Is acceleration a vector quantity?

A

Yes

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

How do you calculate the speed of a distance-time graph?

A

Find the gradient- vertical / horizontal

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

How to find acceleration of velocity time graph

A

Find gradient = y / x = vertical / horizontal

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

Forces on a stationary object?

A
  • Gravity/weight (down)
  • Reaction force (pushing up)

(They are equal)

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

Forces on steady horizontal velocity with forces in balance

A

Thrust (forward)
Drag (backward)
Gravity/Weight (down)
Reaction (up)

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

Forces on steady vertical velocity with forces in balance

A

Drag (up)

Weight/Gravity (down)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Forces on horizontal acceleration with forces unbalanced

A

Only acceleration arrow labelled (forward)

Put arrows around car but no words except ‘acceleration’

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

Forces on vertical acceleration with forces unbalanced

A

Less drag (upwards)

More weight (down) and acceleration (down)

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

What is weight caused by and what is it measured in?

A

Caused by pull or gravity, and it’s a force measured in newtons

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

Is mass a force?

A

NO!

17
Q

What is mass? What is it measured in?

A

How much ‘stuff’ in an object, measured in kg

18
Q

If you go to the moon, what is changed: your mass or your weight?

A

Your mass stays the SAME. Your weight CHANGES

19
Q

Falling object in a vacuum fall at the same rate or a different rate?

A

The SAME rate

20
Q

Why do falling objects in a vacuum accelerate at the same rate?

A

Because space (a vacuum) has no air resistance, so there is no resistance to slow down falling objects - the only acting force on an object is gravity.

21
Q

Objects falling through and atmosphere reach a what?

A

Terminal velocity

22
Q

Why do objects falling through an atmosphere reach a terminal velocity?

A
  • When falling objects first set off, they have more force (weight/gravity) accelerating them than air resistance slowing them down
  • As speed increases, air resistance increases
  • Air resistance gradually increases and reduces the acceleration until it is equal to weight and gravity of falling object
  • When two forces are balanced, the object will not accelerate any more. It will have reached maximum speed - its terminal velocity.
23
Q

When two bodies interact, what happens to the force?

A

They exert force onto eachother

24
Q

If object A exerts force on Object B, what happens next?

A

Then object B exerts the exact opposite force (but same size) on object A.

25
Q

No resultant force means what for velocity?

A

No change in velocity

26
Q

To keep a steady speed of an object there should be how much resultant force?

A

ZERO! NONE!

27
Q

What does resultant force mean?

A

Acceleration

28
Q

If the resultant force acting on a body is not zero, it will accelerate in what direction?

A

The direction of the resultant force

29
Q

What happens to the acceleration or deceleration when the resultant force is big?

A

Acceleration and deceleration will be greater

30
Q

If there’s an overall force, the object will..

A

Accelerate

31
Q

It the object has a steady speed, the forces are…

A

Balanced

32
Q

Difference between speed and velocity?

A

Velocity is a vector, speed is not

33
Q

When all the forces on an object are balanced, what is the resultant force?

A

0

34
Q

How does doubling the size of the resultant force effect the acceleration?

A

The acceleration also doubles

35
Q

How does doubling the mass of an object effect the acceleration?

A

The acceleration halves

36
Q

What is the gravitational field strength of the Earth?

A

10 N/kg

37
Q

What is gravitational field strength measured in?

A

N/kg

38
Q

What are the three stages of falling?

A
  • At the start, the object accelerates downwards because of its weight. There is no air resistance. There is a resultant force acting downwards.
  • As it gains speed, the object’s weight stays the same, but the air resistance on it increases. There is a resultant force acting downwards.
  • Eventually, the object’s weight is balanced by the air resistance. There is no resultant force and the object reaches a steady speed, called the terminal velocity.
39
Q

What are the two forces that affect a falling object?

A

Weight of object

Air resistance

Physics Additional (9 decks)

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