Describing the physical world
Science and Measurement
Motion
Forces
Newton's Laws
100
1 kg = ? grams
What is 1000?
100
__________ - a possible explanation that can be tested by comparison with scientific evidence.
What is an hypothesis?
100
________ - variable which gives direction information includes in its value. "Velocity" is an example.
What is vector?
100
_________ is the metric unit of force, equal to the force needed to make 1 kg object accelerate at 1 m/s2.
What is a Newton?
100
____ is the property of an object to resist change in motion.
What is inertia?
200
1 g = ? kg
What is .001?
200
______________ - a scientific explanation supported by a lot of evidence collected over a long period of time.
What is a theory?
200
Name the coordinate for the point shown on this picture:
What is (2,3)?
200
If an object has a mass of 2 kg, what is its weight?
What is 2*9.8 = 19.6 N?
200
Forces are ____________ when the net force is not exactly zero.
What is unbalanced?
300
Almost all fields of science use ______ units because they are easy to work with and are used around the world.
What is metric?
300
The units for speed are:
What is meters/sec?
300
In an experiment, the variable that causes the change is called the ________________ variable.
What is independent?
300
The two kinds of friction are ________ and _______.
What sliding (or kinetic) and static friction?
300
As you sit on a chair, the chair exerts a normal force of 550N on you. If you weigh 600 N, what is the normal force of the ground on your feet?
What is 50N?
400
How many seconds are in 1:30:30?
What is 5430?
400
What is the speed of a snake that moves 20 m in 5 seconds?
What is 4 m/s?
400
What is the velocity of the object whose position is the following?
What is 10m/s?
400
If the net force on an object is zero, can the object be moving? Explain.
Yes. An object with a net force of zero can be moving with constant velocity.
400
As you coast down a hill on your bike, you accelerate at 0.5 m/s2. If the total mass of your body and the bicycle is 80 kg, with what force is gravity pulling you down the hill?
What is 40 N?
500
True or False? "Race cars run on solar energy" is an accurate statement.
What is "True"? Sun is the ultimate source of the energy because petroleum products come from ancient plants that have been transformed over time.
500
If I know speed and distance, how can I calculate time?
What is t = d/v?
500
When a ball is first dropped off a cliff in free fall, it has an acceleration of 9.8 m/s2. What is its acceleration as it gets closer to the ground? Assume no air friction.
What is 9.8m/s2 because its acceleration is constant. Its speed changes, but acceleration stays constant.
500
What is the net force on the truck? Your answer must be complete, and answered in the form: ____ __ _____
What is 5 N to the right (or east)?
500
Jane has a mass of 40 kg. She pushes on a 50 kg rock with a force of 100 N. What force does the rock exert on Jane?
What is 100N? The rock and Jane are a action-reaction pair.