# Forces and their Effects

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• Created by: Nicole D
• Created on: 18-12-13 12:29
Forces and their Effects
23 Questions
1 of 25
Vectors are quantities that have both _____(1)_____ and _____(2)_____
(1) Direction ; (2) Magnitude
2 of 25
Scalar quantities have only ____________
Magnitude
3 of 25
Give 3 examples of vector quantities
May include: Force, Acceleration, Velocity, Momentum, Displacement, Weight
4 of 25
Give 3 examples of scalar quantities
May include: Mass, Distance, Speed, Time, Length, Temperature
5 of 25
Is it vectors or scalars which can be both positive and negative?
Vectors
6 of 25
What is velocity?
Speed in a specified direction
7 of 25
What is displacement?
Distance travelled in a specified direction
8 of 25
What is acceleration?
The rate of change of velocity
9 of 25
The next 4 questions are based on vector notation not scalar
...
10 of 25
What vector is represented by 's' and what is it measured in?
Displacement measured in metres (m)
11 of 25
What vector is represented by 'v' and what is it measured in?
Velocity measured in metres per second (m/s)
12 of 25
What vector is represented by 'a' and what is it measured in?
Acceleration measured in metres per second squared (m/s^2)
13 of 25
What vector is represented by 'F' and what is it measured in?
Force measured in newtons (N)
14 of 25
What is another way of describing velocity?
The rate of change of displacement
15 of 25
Therefore what is the equation linking velocity and displacement?
Velocity = Displacement ÷ Time
16 of 25
What is the equation linking acceleration and velocity?
Acceleration = Velocity ÷ Time
17 of 25
A car travels 10km due West followed by a journey of 15 km due south in a time of 1 hour. Calculate their displacement.
Displacement^2 = 15^2 + 10^2 = 225 + 100 = 325 ; so displacement = 18 km
18 of 25
What is the equation linking acceleration, final velocity and initial velocity?
Acceleration = (Final velocity - Initial velocity) ÷ Time ; a = (v - u) ÷ t
19 of 25
For the next question you need to rearrange the previous equation to make final velocity the subject...
Final velocity = Initial velocity + (Acceleration x Time) ; v = u + at
20 of 25
A car is travelling at 10 m/s when the driver accelerates at 2 m/s^2 for 10 seconds. Calculate the final velocity.
v = u + at ; 10 + (2 x 10) = 10 + 20 = 30 m/s
21 of 25
What is a ticker timer?
A machine which produces dots on a piece of paper to enable us to work out speed and / or acceleration at any point
22 of 25
If the amount of dots is 50 per second, then what is the time interval between dots
There is an interval of 1 / 50 or 0.02 seconds between dots
23 of 25
What alternative experiment uses time to work out the acceleration of an object?
The use of light gates and a datalogger
24 of 25
What happens during this experiment?
We place an interrupt card on a set of wheels allowing it to slide down a ramp through a light gate. The computer would then calculate the speed at the start and end of the interrupt card. These speeds are used to calculate the acceleration.
25 of 25

## Other cards in this set

### Card 2

#### Front

Vectors are quantities that have both _____(1)_____ and _____(2)_____

#### Back

(1) Direction ; (2) Magnitude

### Card 3

#### Front

Scalar quantities have only ____________

### Card 4

#### Front

Give 3 examples of vector quantities

### Card 5

#### Front

Give 3 examples of scalar quantities