The Man’s Jeopardy
Feb 09, 2016
The Man’sJeopardy
Learning Objectives1. Describe what a force is.2. Describe how balanced and unbalanced forces are
related to an object’s motion.3. Describe friction and identify the factors that determine the
frictional force between 2 objects.4. Identify the factors that affect the gravitational force
between two objects, and describe how they affect this force.
5. Explain why objects accelerate during free fall (by describing how gravity affects falling objects).
6.6. Apply Newton’s Apply Newton’s 11stst Law of Motion Law of Motion to real world examples.7.7. Apply Newton’s Apply Newton’s 22ndnd Law of Motion Law of Motion to real world examples.8.8. Apply Apply Newton’s 3Newton’s 3rdrd Law of Motion Law of Motion to real world examples.9. Explain how an object’s momentum is conserved &
calculate momentum.10. Apply the law of conservation of momentum to real world
examples.
RULES1. There will be round robin play and all
questions will be all-play even for the daily doubles
2. The teams who answers correctly win the point value of the question.
3. If a team answers a daily double incorrectly, then that team will lose the number of points they bid.
4. There are two daily doubles available.Let’splay
100
200
300
400
500
Final Jeopardy
100 100 100
200200200
300300300
400400400
500500500
Forces & Friction
Gravity Newton’s Laws 1&2
Newton’s 3rd Law & Momentum
Forces & Friction for 100
Which of the following is NOT an example of exerting a force on an object: pushing a button, punching a mascot, running to school? What effect do unbalanced forces have on an object’s motion?
Running to School (not exerting a force)Unbalanced forces change an object’s motion.
Forces & Friction for 200
An object is falling toward the Earth at 9.3 m/s/s. Why is the object not falling at 9.8 m/s/s? In general, what type of force resists any object’s motion in the opposite direction?
Air ResistanceFriction
Forces & Friction for 300
What force typically causes momentum to seem like it was NOT conserved? Example- the collision of two hockey players.
Friction
Forces & Friction for 400
Give an example of how decreasing friction is helpful.
Oiling a machine or bike, waxing a snowboard, using a cart with wheels to
move an object
Forces & Friction for 500Using the diagram below, what direction is the net force on the object? What is the net force? How could you balance the forces on the object?
Down, 50 N, Increase the upward force by 50 N
150 N
200 N
Gravity for 100
The force that acts on all objects on Earth and is the only force acting on an object in free-fall is ___________.
Gravity
Gravity for 200
How can the gravitational attraction between 2 objects be decreased?
Lower the mass and spread the objects further apart.
Gravity for 300
Suppose a planet with a mass of 100.5 x 1024 kg was discovered. Based upon the data above, what is a possible value for the gravitational pull of this new planet?
Any value from 1.1 to 2.3 would be correct. The best values would be between 1.1 and 1.5.
Planetary Body Mass (x 1024 kg) Gravitational Pull (relative to Earth)
Pluto 0.0013 0.1
Earth’s Moon 0.07 0.2
Mars 0.64 0.4
Earth 5.98 1.0
Jupiter 1900 2.4
The Sun 1,989,000 7.1
Gravity for 400Bob and Joe believe that heavier objects fall faster. They design an experiment to test out their prediction. What is their hypothesis? How should they design the experiment? What is ONE variable that Bob and Joe should try to keep constant? Give answer verballyGive answer verbally.
Hypothesis- Heavier objects fall faster.Design- Drop objects of different masses and
determine their acceleration (or the time it takes for them to hit the ground).
Constants- Height of the drop, air/wind resistance (if possible), same timer or timekeeper, etc.
Gravity DAILY DOUBLE!
Three satellites are orbiting the Earth. The distance from Earth is 6,000 km for Satellite A; 10,000 km for Satellite B; and 35,800 km for Satellite C. Which one would Earth have the greatest attraction for? Explain why.
Satellite A because it’s the closest.
Newton’s Laws 1 & 2 for 100
The ability of an object to resist a change in motion is called ___________.
Inertia
Newton’s Laws 1 & 2 for 200
What types of objects have the greatest inertia? What do objects in motion tend to do? What do objects at rest tend to do?
Heavier objectsObjects in motion tend to stay in motion
Objects at rest tend to stay at rest
Newton’s Laws 1 & 2 for 300An object accelerates at 4 meters per second2 for a force of 20 N. How much force is needed for an acceleration of 40 m/s/s for the same object? If the amount of force on a heavy object is the same as the amount of force on a lighter object, then which object will have the lower acceleration?
10x the acceleration for a constant mass = 10x the force, so 200 N
The heavier object will have the lower acceleration.
Newton’s Laws 1 & 2 for 400
A 100 kg person is skydiving. What is the force of gravity (or weight) acting on the skydiver?
F = m x aF = 100 kg x 9.8 m/s/s
F = 980 N
Newton’s Laws 1 & 2DAILY DOUBLE!!!
Give two real world examples of Newton’s 1st Law (you may do this verbally instead of writing it down).
A car stops and your body moves forward, a car takes off and your body moves backward, etc.
Newton’s 3rd Law & Momentum for 100
According to Newton’s 3rd Law, for every action there is an _________ and ________ reaction.
For every action there is an equal and opposite reaction.
Newton’s 3rd Law & Momentum for 200
What are the action-reaction forces when a carpenter hammers a nail?
Action = hammer striking the nailReaction = nail pushes back on the hammer
Newton’s 3rd Law & Momentum for 300
How is momentum calculated? True or False. Change the underlined word to make it true. The momentum of an object is in the OPPOSITE direction of that object’s velocity.
Momentum = mass x velocityFalse, momentum is in the SAME direction as
the object’s velocity.
Newton’s 3rd Law & Momentum for 400
If the total momentum after a collision is 10 kg x m/s, then what was the total momentum before the collision? Explain how you know.
10 kg x m/s because momentum is conserved (remains the same and is not lost, only
transferred)
Newton’s 3rd Law & Momentum for 500
How can an object’s momentum increase? Provide 2 ways2 ways.
Moving faster or higher velocityGreater the mass, the higher the
momentum
Force DiagramDraw a force diagram for a person pushing a large oven up a ramp toward the left. Correctly label all of the forces acting on the “box” using arrows of the correct length.