# Topic 2 Flashcards Preview

## Edexcel GCSE Physics > Topic 2 > Flashcards

Flashcards in Topic 2 Deck (31)
1
Q

Acceleration Due to Gravity

A

The acceleration, g, experienced by an object travelling in freefall. Its value at the surface of earth is 10m/s²

2
Q

Acceleration

A

The rate of change of velocity.

3
Q

Braking Distance

A

The distance a vehicle travels under the braking force. This can be affected by adverse road conditions and weather conditions and the condition of the vehicle.

4
Q

Centripetal Force

A

The resultant force that acts towards the centre of a circular path of an object travelling with circular motion.

5
Q

Circular Motion

A

The motion of an object travelling in a circle. An object travelling in circular motion is always accelerating.

6
Q

Why is an object in circular motion always accelerating?

A

Because of its continual direction change. This means centripetal force is always required.

7
Q

Conservation of momentum

A

The total momentum of a system before an event is always equal to the total momentum of the system after the event.

8
Q

Displacement

A

A measure of how far an object moves in a given direction. It is the straight line between the starting and finishing points in a vector quantity.

9
Q

Distance

A

A measure of how far an object moves. It is a scalar quantity.

10
Q

Free-Fall

A

Motion under the force of gravity alone.

11
Q

Human Reaction Time

A

The time it takes for the brain to react to the stimulus.

12
Q

Typical Human Reaction Time

A

0.2-0.9 Seconds

13
Q

Inertial Mass

A

A measure of how hard it is to change an objects velocity.

14
Q

What is Inertial Mass equal to?

A

Ratio of Force/Acce

15
Q

Unit of Force

A

Newton

16
Q

Newtons First Law

A

If an objects resultant force is zero the object will remain at a constant velocity.

17
Q

Newtons Second Law

A

An objects acceleration is directly proportional to the resultant forces acting on it, and inversely proportional to the objects mass .

18
Q

Newtons Third Law

A

The forces that two objects exert on each other when they interact are equal and opposite

19
Q

Resultant Force

A

The single force that can replace all the individual forces acting on an object and have the same effect.

20
Q

Scalar Quantities

A

Quantities that only have a magnitude.

21
Q

Speed

A

A measure of change in distance.

Scalar Quantity

22
Q

Speed =

A

Distance/Time

23
Q

Stopping Distance

A

The sum of the thinking and breaking distances.

24
Q

Thinking Distance

A

The distance a vehicle travels during the drivers reaction time. This can be affected by tiredness, drugs or alcohol.

25
Q

Vector Quantities

A

Quantities that have a magnitude and a direction.

Represented by an arrow, length for magnitude and direction of arrowhead for direction.

26
Q

Velocity-Time Graph

A

A plot of how an objects velocity changes over time.

27
Q

A

Acceleration

28
Q

Area Underneath Velocity-Time Graph

A

The objects displacement

29
Q

Velocity

A

A measure of the rate of change of displacement.

Scalar Quantity

30
Q

Weight

A

The force acting on an object due to gravity.

31
Q

Weight is Equal to…

A

Mass*Gravitational Field Strength