# P2.3 Motions and forces Flashcards Preview

## Physics additional edexcel > P2.3 Motions and forces > Flashcards

Flashcards in P2.3 Motions and forces Deck (26)
1
Q

What is the difference between distance and displacement?

A

Displacement is a vector, direction isn’t

2
Q

What is the equation for finding speed?

A

Speed (m/s) = distance(m) / time(s)

3
Q

What is a vector?

A

A quantity that has a magnitude and a direction

4
Q

What is on the y-axis in a distance-time graph?

A

Distance

5
Q

How can you calculate speed in a distance-time graph?

A

Find the gradient if the line

6
Q

What do horizontal lines in a distance-time graph mean?

A

The object is stationary

7
Q

What is acceleration?

A

A moving object’s change in velocity

8
Q

What does getting a negative value when calculating acceleration mean?

A

The object is decelerating or slowing down

9
Q

What is the equation for calculating acceleration?

A
```a = (v - u) / t
a = (final velocity - initial velocity) \ time```
10
Q

What is acceleration measured in?

A

m/s^2

Metres per second squared

11
Q

What does a horizontal line in a velocity-time graph mean?

A

The object is travelling at a constant velocity

12
Q

How does the steepness of the line affect acceleration in velocity-time graph?

A

The steeper the line the greater the acceleration

13
Q

How do you calculate distance from a velocity-time graph?

A

You find the area under the graph

14
Q

What is a force?

A

A push or a pull that can make objects change speed, shape or direction

15
Q

Is force a vector quantity?

A

Yes

16
Q

When are forces balanced?

A

When they are equal but acting in opposite directions

17
Q

What is a resultant force?

A

When all the forces acting on an object are combined into one

18
Q

What happens if the resultant force on an object isn’t 0?

A

The object will accelerate in the direction of the resultant force

19
Q

What does the size of acceleration from a resultant force depend on?

A

The size of the force and the mass of the object

20
Q

How do you calculate force?

A
```F = m x a
F = mass (kg) x acceleration```
21
Q

What do you measure force in?

A

N, newtons

22
Q

What is gravitational field strength measured in?

A

N/kg

23
Q

What is the equation used to calculate weight?

A
```W = m x g
W = mass x gravitational field strength```
24
Q

What is the gravitational field strength on Earth?

A

10N/kg

25
Q

As mass increases, what happens to the force from gravity?

A

It increases

26
Q

What is terminal velocity?

A

The constant maximum velocity reached when the forces acting on a falling object are balanced