Car Safety
Newton's 1st Law
Energy Efficiency
Newton's 2nd Law
Distance/Speed
100
Why do young people tend to drive older cars and why is this a problem?
Because they are cheap. The problem is they are unsafe and are the cause of higher injury and death rates.
100
In which direction with the tug-of-war move and why?
To the left because the red arrow is larger, meaning it has a larger force.
100
Define 'energy'.
Energy is the capacity to do work.
100
A car with a mass of 2500kg is accelerating at 5m/s2.
Calculate the force being applied.
Calculate the force being applied.
Force = mass x acceleration
F = 2500 x 5
= 12500N
100
State the equation for calculation distance, speed and time.
Speed = distance / time
200
Why is talking to a passenger in your car less distracting than talking on your mobile phone?
Because the passenger is a 2nd set of eyes to warn you of upcoming hazards, and they usually stop talking to avoid distracting you when issues arise.
200
Define the term 'unbalanced force'
Forces that are not equal in size
200
Name seven different forms of energy.
Kinetic, electrical, nuclear, chemical, gravitational potential energy, elastic, light, sound, thermal heat, radiant heat
200
If a person with a mass of 50kg is moved with a force of 100N, how fast will they be accelerating?
Force = mass x acceleration
Rearrange the equation: acceleration = force / mass
Acc = 100 / 50
= 2m/s2
200
If a kid on a scooter travels 200m in 50 second, what speed are they travelling at?
S = d / t
= 200m / 50s
= 4 m/s
300
A driver distracted by a mobile phone has the reaction time of a ....
person with a blood alcohol reading of 0.05.
300
State Newton's First Law
A body in motion will stay in motion, or a body at rest will stay at rest, unless acted upon by an unbalanced force.
300
State the Law of Conservation of Energy
Energy is never lost or gained, it is either transformed or transferred.
300
State Newton's second law?
Force = mass x acceleration
300
What is the difference between displacement and distance?
Distance is a scalar quantity, with size only.
Displacement is a vector quantity, with size AND direction.
400
Name three safety features of new cars that reduce the effect of forces in car accident.
1. Seat belts - stop your body continuing forward when the car suddenly stops.
2. Air bags - they absorb the kinetic energy of your body and soften the impact.
3. Crumple zone - front section of the car that crumples up in an impact, absorb force.
400
Define the term 'inertia' and give an example of it.
Inertia is an object's resistance to changes in movement.
Example: the passengers fall forward when a moving bus stops suddenly due to inertia of motion.
400
Define the term 'Watt' and complete the following:
1 watt = ____ joules/second
A Watt is the amount of energy (in Joules) that an electrical device (such as a light) is burning per second that it's running.
1 watt = 1 joule/sec
400
Specify the value of acceleration due to gravity (including units)
9.8 (or 10) m/s2
400
What is the difference between speed and velocity?
Speed is a scalar quantity with size only.
Velocity is a vector quantity with size AND direction.
500
What the acronym ANCAP represent and what does an ANCAP rating tell you?
Australasian New Car Assessment Program
500
In what year was Sir Isaac Newton born?
1643
500
Write the formula for efficiency on the board.
Efficiency = useful energy x 100%
total energy
500
What is the relationship between force and acceleration?
The greater the force applied to an object, the greater it's acceleration
500
Draw this on the board and calculate the person's displacement:
A person walks 10 m to east, turns and walks 10m to the north, then turns and walks 10m west.
Calculate their displacement.
10m North.