# 13. P8 Forces and Motion Flashcards Preview

## SHHS - Science - Physics GCSE 2018on > 13. P8 Forces and Motion > Flashcards

Flashcards in 13. P8 Forces and Motion Deck (21)
1
Q

Frictional forces always ?.

A

oppose motion

2
Q

What is the equation for Work done

A

Work done = Force x distance

3
Q

If the forces on an object are balanced?

A

…it will stay at a constant velocity (same speed and direction) or at rest

4
Q

What are the two things that a force does?

A
1. Changes an object’s motion 2. Change an object’s shape
5
Q

What is Hooke’s Law?

A

Force = spring constant x extension

6
Q

Describe the forces if an object is not moving or not getting faster or slower.

A

The forces on it are balanced

7
Q

What is the equation for Weight?

A

Weight = mass (kg) x gravitational field strength

8
Q

Acceleration is?

A

when an object’s velocity (speed or direction) change

9
Q

The equation for acceleration is ?

A

a = change in velocity / time taken

10
Q

If an unbalanced force acts on an object?

A

it will cause an acceleration

11
Q

Stopping distance =

A

Thinking distance + braking distance

12
Q

What are the factors that affect Thinking distance?

A

Tiredness, drugs or alcohol, speed, distractions

13
Q

The greater the force on an object that can’t move?

A

The greater the extension the force causes.

14
Q

What are the factors that affect Braking distance?

A

Worn tyre or brakes, road surface (rain or ice), speed

15
Q

The equation for accelerating force (Newton’s second law)

A

Force (Newtons) = mass (kg) x acceleration (m/s2)

16
Q

The larger the Resultant (Overall) force on an object

A

The greater the acceleration

17
Q

On a distance time graph the steeper the gradient

A

The faster the object is travelling

18
Q

On a distance time graph a horizontal line means

A

The object is stationary

19
Q

On a velocity time graph the steeper the gradient ?

A

The greater the acceleration

20
Q

Forces acting in the same direction

A

Add to give the resultant force

21
Q

Forces acting in opposite directions

A

Subtract to give the resultant force.