Contact Forces
Name 3 contact forces
Friction, tension, normal, air resistance, applied, spring
Is this a scalar or vector quality: 75 km north
vector
What unit do we measure magnitude in?
Newtons
Name 3 simple machines.
Pulley, leveer, wheel and axle, wedge, inclined plane, screw.
Name a technology that reduces friction.
Furniture sliders, lubricants, or wheels
What contact force occurs when you play tug of war?
Tension
Is this a scalar or vector quantity: 12 kilometres
Scalar
How much force (in newtons) do we need to lift 1 kg?
10 Newtons (or 9.8 Newtons)
What is the driver gear?
How efficient is a machine that take 100 J of energy in, and 75 J of useful energy out
0.75 or 75%
What force does a table exert to support a water bottle on top of it?
Normal force
Calculate the displacement if Jayden drove 100 m north, then 50 m south.
50m
If a box weighs 5.5 kg, how many newtons of force do we need to lift it?
55 Newtons
If the driver gear has 20 teeth and the driven gear has 40 teeth, what is the mechanical advantage?
40/20 = 2
What are the 3 types of friction?
Static, rolling, and sliding.
What force is occurring when someone is pulling a suitcase
Applied
Calculate the distance travelled if Maddie travelled 500 km east, then 300 km west
800 km
How many grams are in a kilogram??
1000 grams
When is torque increased in gears?
When the smaller gear is the driver
What type of friction is occuring when your desk is still on the floor?
Static
What equation do we use to calculate work?
Force x Distance