Forces
The sum of all the forces is called the
resultant force
The units of moment are this
What isNm
In your practical, which two variables did you measure to calculate density?
Mass and volume
State the equation for Pressure
P=Force/Area
State equation for speed.
Distance/time= speed
Name 3 contact forces
Air resistance
Reaction/Normal Force
friction
Moment is defined as this.
Turning effect of a force
What are the units for density?
g/cm3 or Kg/m3
If the force on an object is 150 N and the pressure it experience 30 N/m2. What is the area of the object?
0.2 m2
Convert 60 km/hr into m/s.
First person to do it will get extra 200 points. Show your work.
16.67m/s
Name 3 non-contact forces. Non-contact forces act in ______
gravitational
electrostatic
magnetic
*fields
Force x distance
The density of water is 1000kg/m3. Does blood with a density of 721 kg/m3 float or sink in water?
Float
Why does air pressure decrease with increasing altitude?
density of air particles lowers
Car A is travelling 40km/h West and Car B is travelling 30km/hWest. What is the relative motion of Car A to Car B?
10 km/h
Name 3 ways to reduce the force of friction
Smooth surface
add lubricants
make surface area smaller
a point over which rotation occurs is called
pivot or fulcrum
if the volume of an object is 300cm3, and the density is 4.0 g/cm3. What is the mass of the object in kg?
120kg
Gotchya.
Tom pushes a table with a force of 6 N to the left. Tina pushes the table with a force of 12 N to the right. The table has a motion in this direction with this amount of net force.
What is 6N accelerating to the right?
Car A is travelling 40km/h East and Car B is travelling 40km/hWest. What is the relative motion of Car A to Car B?
80 m/s
Two scenarios when forces acting on an object are balanced
Stationary
Constant speed
When a system is in equilibrium what can you say about its anti-clockwise and clockwise moments?
They are balanced
Choose someone in the class and you may take their 200 points if you can answer the following question.
Describe how to measure the density of irregularly shaped objects.
Using eureka can, water, displace water that is the volume. Use scale for mass. divide
What variable can impact the pressure of liquids
density of the liquid
What is the difference between weight and mass
W= mg