# Physics

HideShow resource information
How do you calculate speed/The Gradient/slope of the graph?
Average speed (m/s)= Distance Travelled (m)/time taken (s)
1 of 21
What does a horizontal line mean on a distance-time graph?
The car is at rest
2 of 21
What happens when the car is moving at a constant speed (distance-time graph)?
The gradient of the graph is level (Straight line)
3 of 21
What happens if the car travels faster (distance-time graph)?
The line will be steeper
4 of 21
What is velocity?
Speed in a particular direction.
5 of 21
What happens if an object changes velocity?
It is accelerating
6 of 21
How do you work out acceleration?
Acceleration (m/s2)=Change in velocity (m/s)/Time taken for the change (s)
7 of 21
What does a horiztonal line in a velocity-time graph?
That the car is travelling with a constant velocity
8 of 21
What happens when the car accelerates more rapidly on a velocity time graph?
The graph has a steeper slope
9 of 21
How do you work out the distance travelled using a velocity time graph?
It is the area under the graph line
10 of 21
What happens when an object's forces are balanced (no resultant force)
When an object is at rest it stays at rest; if it is moving and it keeps on moving at a constant speed in a straight line
11 of 21
What happens when the forces on an object do not cancel out ( there is a resultant force/unbalanced forces)?
A stationary object will start to move in the direction of the resultant force; an object already moving in the direction of the force will speed up (accelerate); and object moving in the oppposite direction to the force will slow down (decelerate)
12 of 21
What happens when the resultant force is greater?
The greater the aceleration (or deceleration)
13 of 21
What happens to the force when the mass of an object increases?
The bigger the force that is needed to give it the same aceleration.
14 of 21
When does a force of friction act?
When an object moves through the air or water; when solid surfaces slide, or try to slide across each other. The objects heat up (and wear away)
15 of 21
What is terminal velocity?
Object falls through (gas or liquid); faster it moves;greater force of friction. When body falls; at start acelerates due to force of gravity (weight). Frictional forces (e.g. air resistance) increase until balance. R.force=0. Terminal velocity.
16 of 21
How do you work out resultant force?
Resultant force (N)=Mass (kg) * Acceleration (m/s2)
17 of 21
What happens when a force moves an object?
Energy is transferred and work is done?
18 of 21
What does work done equal?
Energy transferred (J)
19 of 21
How do you work out work done?
Work done (J)=Force applied (N) * Distance moved in the direction of the force (m)
20 of 21
What happens when an object is lifted up?
Work is done against the force of gravity, its weight.
21 of 21

## Other cards in this set

### Card 2

#### Front

What does a horizontal line mean on a distance-time graph?

#### Back

The car is at rest

### Card 3

#### Front

What happens when the car is moving at a constant speed (distance-time graph)?

### Card 4

#### Front

What happens if the car travels faster (distance-time graph)?

### Card 5

#### Front

What is velocity?