Review
VECTOR quantities have ________
size and direction
Acceleration is measured in?
m/s2
The number for acceleration due to gravity
9.81 m/s2
An object falling through the air eventually reaches
Terminal Velocity
I am underwater. Current pushed up with 1000N and weight is 900N
What happens?
I move upwards
What is the rate of change of velocity?
Acceleration
Mass is measured in?
kg
In F=ma. What does each variable represent?
F - Force
m - mass
a - acceleration
What force keeps the Earth in orbit?
Gravity
The force on a car is 600N. Resistive Forces are 400 N
What is the Resultant Force?
200N
What does the slope of a distance-time graph tell you?
Speed or Velocity
What is the unit of Force?
Newton (N)
For every action, there is an equal and opposite reaction.
What is Newton's Third Law of Motion?
What force is caused by gravity acting on a mass
Weight
The engine force of a car is 1000N.
Friction is 200N
Air resistance is 250N
What is the Resultant force?
550N
What does the slope of a speed time graph show?
Acceleration
Weight is measured in?
N
Odd one out: Tension, Kinetic, Weight, Friction
Kinetic
F= ma - whose Law is this? (DOUBLE)
Isaac Newton
A thrust force of 500N acts on a 1000kg car. What is the acceleration?
0.5 m/s2
How do we show deceleration?
Minus sign
What are the Fundamental units of a Newton?
N=kg(m/s^2)
List four contact forces
Friction
Air resistance
Tension
Normal contact
What is the proper name for the overall force acting on a body?
Resultant Force
On holiday on Mars, Gravity is 1.6N/kg. I have a mass of 80Kg. I eat 10kg of Pies. What is my new weight ?
144N
A jet weighing 2.75x106N is ready for takeoff. If the jet engines can supply 6.35x106N of thrust, how much runway is needed to reach the minimum takeoff speed if 79m/s?
~138m