Definitions and Examples
What is pressure?
Pressure is applied force per unit area
What do we use to measure temperature?
Thermometer
What unit can we use to measure force?
Newtons
What is force?
Something that causes a change in motion of an object
Mention one example of an object that uses a lever.
Hammer, wheel barrow, scissors, catapult
What is a machine?
Anything that helps make work easier.
What simple machine would you use to lift up a heavy load?
Pulley
What units can we use to measure area?
Squared cm, squared meters, etc.
What type of forces are there? 2 types
Contact and non-contact forces
Name an situation or example in which a wedge might be useful
Cutting down a tree, when trying to separate 2 things that are together, etc.
Mention 2 examples of times when we need low pressure applied over a large area
Snow shoes, skis, snowboards
What can we use to measure wind speed?
Anemometer
What is the difference between weight and mass?
Weight depends on gravity, which means it's different in each planet. Mass is the measure of how much matter is in an object.
Mention 2 non-contact forces
Gravity and magnetism
Mention 3 different simple machines
Wedge, pulley, lever, wheel and axle, screw, ramp
Mention 2 examples of times when we need high pressure on a small surface area
Nails, soccer shoes, needles
What do we use to measure force? (Think of your lab activity)
Spring scale
What is the constant acceleration created by gravity on Earth?
9.8 m/sec2
Mention 3 contact forces
Friction, air resistance, buoyancy
How many classes of levers are there?
What is Hooke´s Law?
The law that states the extension of a spring is proportional to the load applied to it.
What instrument do we use to measure air pressure?
Barometer
What are 2 units to measure air or atmospheric pressure?
Pascals and mmHg
What do we use to represent forces?
Arrows with different sizes
What type of lever is a wheel barrow?
Second class lever