m:sc.
t/f: velocity tells direction
true
An object at rest stays at rest unless acted upon by an outside force. This is part of which law?
newtons 1st law
What type of friction has less force than sliding friction?
Rolling friction
what is the force measured in?
Newtons
what do D. S. and T. stand for when talking about speed?
Distance. Speed. and Time.
A rough surface needs ___________ force to overcome friction
More force
Does the momentum of pool balls relate to one of Newton's laws and which law?
yes, the 3rd law.
what are the 6 types of friction?
rolling, sliding, static, helpful, and harmful.
momentum depends on an objects ------ and ------.
mass and volocity.
How do you find speed? Make the triangle
the house of cards is a demonstration of what?
balance force.
The acceleration of an object is directly proportional to the force applied to it. This is part of which law?
newtons 2nd law
What type of friction act on objects that are not moving?
static friction
What is the weight of a 33 lb dumbbell on Earth? transferred into Newton.
150 newtons
What is constant speed?
something moving at a steady speed.
these 2 things determine the acceleration of any object.
force and mass.
what law was demonstrated during the penny and the coat hanger activity?
Newtons 2nd law.
sliding friction does what?
opposes movement.
A pitcher accelerates a ball at 80.0 m/s2 by exerting a force of 20.0 N. What is the mass of the ball? use calculator if needed.
0.551 lbs
What happens to the speed of a car if we added rocks to the trunk?
The speed will decrease.
What is displacement?
The difference between something's starting position and final position.
What law was shown in the Paper Clip Racers activity?
The 2nd law
one thing that happens during static friction is what?
When force gets applied the object doesn't move.
A constant net force acting on an object causes the object to move with constant _____________.
acceleration
What is a speed that is constantly changing?
Instantaneous speed