Motion
Laws of Motion
Contact Forces
Non-contact Forces
Potential Energy
100
What is motion
A change in position
100
What is inertia?
An objects resistance to change its motion. (It wants to keep doing what it is already doing)
100
A golf ball rolls to a stop inches from the hole. What caused the ball to stop moving?
friction
100
Name the 3 types of non-contact forces.
gravity, electricity and magnetism
100
How can we tell if an object has a lot of potential energy?
If it wants to move or not.
200
What are some reference points you might use to show that a car is in motion?
Answers will vary
200
What is Newton's 1st law (both parts)!
An object in motion will stay in motion AT CONSTANT VELOCITY until acted upon by an UNBALANCED force. An object at rest will stay at rest until an UNBALANCED force acts on it.
200
What is drag.
Friction through air (gas) or water (liquid).
200
If you were to travel to Mercury. How would your mass and weight compare to when you were still on Earth?
Your mass would be the same (you didn't lose any part of your body), but your weight would decrease because Mercury has less gravity due to it's smaller mass.
200
An objects gravitational potential energy depends on what two things?
Height above the Earth and mass
300
What are some reference points you could use to say that you are not moving even when you are in a car traveling 65m/h?
Answers will var
300
Use Newton's 2nd Law of Motion to explain why I have to push harder on a cart full of groceries than on an empty cart.
The full cart has more mass. Therefore, you need to apply more force to get it to accelerate.
300
What do unbalanced forces tell you about an objects speed?
It is changing/accelerating
300
Like charges _____________ and opposite charges _________
repel; attract
300
I have two magnets. Their North poles are touching. Does this represent high potential energy or low potential energy? Explain
High; since they are like poles my magnets will want to move away from each other.
400
Determine the velocity of a car that traveled 60 miles in 2 hours on I-70E.
30m/h E
400
Sarah gives this example of Newton's 3rd Law of Motion: Jim is pushing on the car to the right while the car is pushing on Jim to the left. What is missing from Sarah's answer?
That the forces are equal!
400
What is the net force on a box if a man is pushing on it to the right with a force of 20N and friction is pushing back on the box with a force of 15N to the left?
5N to the right.
400
As you increase your distance from a charged object (balloon) how does the strength of the electrical force change?
It decreases
400
How can you increase elastic potential energy in a sling shot?
stretch it out
500
What part of a graph tells you the speed of an object?
What is the slope
500
Explain how a hockey can continue gliding across a rink at a pretty consistent speed even without a person continuously hitting it.
Newton's 1st law. The puck is in motion and wants to stay in motion until acted upon by an unbalanced force.
500
Forces that cancel out and cause CONSTANT motion are called _______________.
balanced forces
500
How is it that some objects can act at a distance while others cannot?
Objects that can act at a distance have a field surrounding them.
500
Which would have more potential energy; Two +7 that are close together or Two +4 charges that are close together
+7
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