Measurement and Units
Write the names and values of three different unit prefixes.
Answers vary
If I walk 4 m north from my couch to the window, then halfway back to the couch, what is my displacement at the end of my walk?
2 m north
Write an example of Newton's 1st Law from the real world.
Answers vary.
These two factors can affect an object's kinetic energy.
Mass and speed.
A UFO flies across the sky with an average speed that is equal to its instantaneous speed.
We could also say that its speed is _____________.
Constant
What does the slope of a distance-time graph represent?
Velocity
What is the average velocity of a runner who runs 50 m east, then 25 m west, then 50 m east in a time of 75 s?
1 m/s
If you push a 50 kg block with a 300 N force, what will be the acceleration of the block?
60 m/s2
As an object falls, how does its GPE change?
How does its KE change?
GPE decreases. KE increases.
A ball sits at the top of a hill at rest, with a total mechanical energy of 100 J. Find its kinetic energy when it has rolled halfway down the hill.
50 J
Explain the difference between weight and mass.
Mass is the amount of matter in an object, weight is the force of gravity acting on the object.
What is the average speed of the runner in the 200 pt Motion question?
1.67 m/s
Gravity pulls a skydiver downward toward the surface of Earth. If this is an action force, what would be the reaction force in the action-reaction pair?
The skydiver pulling Earth via a gravitational force.
A taxi speeds up rapidly along a flat road after a traffic light changes from red to green. How does its GPE change? How does its KE change?
GPE is constant. KE increases.
How will the frequency of a wave change if you double its period?
It will decrease by 1/2.
Convert 120,000,000 cm to km.
1200 km
What is the acceleration of a dog who runs to catch a frisbee and speeds up from 1 m/s to 5 m/s in 2 seconds?
2 m/s2
A cat is pulled on by her needy kittens. The first pulls East with 1 N. the second pulls West with 2 N. The third pulls 50 N West (it's really strong). If the mass of the mother cat is 4 kg, what is her acceleration?
13 m/s2 West
A 0.11 kg hamburger falls off of a 1 m tall table. When it is halfway to the floor, how much kinetic energy does it have?
What is 0.54 J?
Bringing a negatively charged balloon near a neutral conductor will produce a(n) _______________ force.
Attractive
Convert 150 mg to kg.
0.00015 kg
You drop a ball on Earth and it falls from rest for 3 seconds. What is its speed? (Ignore air resistance.)
29.4 m/s
If a 50 kg crate is lifted upward by a 1000 N force, what is the acceleration? (Hint: you will need to find the net force first, including gravity.)
10.2 m/s2 upward
A 30 kg jogger runs up a hill to reach an elevation of 8 m, then turns around and runs back down the hill. The whole trip takes 70 seconds, and occurs at a constant speed of 2.5 m/s.
Find the kinetic energy of the jogger.
93.8 J
Write an example of an object that is charged by induction.
Answers vary