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1. In your own words, explain the concept of inertia:
2.
How does inertia apply to Newton’s 1st law of Motion?
3.
If a ball rolls 1 meter in 5 seconds, what is it’s velocity?
4. If a steady force is applied to a ball on the floor, what will happen to the ball? Be
sure to use physics words like Force, mass, velocity, acceleration…
5.
Briefly explain Newton’s 2nd Law of Motion:
6.
What is the equation for calculating force?
7.
If an object has a mass = 10 Kg and is accelerating at 2 m/s2, how much force is
being applied to the object?
8.
You throw a ball. When the ball is many meters away from you, is the force of
your hand still acting on the ball? Explain.
9.
Is the ball accelerating? Explain.
10. What are 2 ways to find the center of mass of a skateboard?
11. How much work does a figure skater do when lifting a 50-kg skating partner’s
body a vertical distance of 1 m in a pairs competition?
12. Calculate the amount of work, in joules, done when:
a) a 1.0-N weight is lifted a vertical distance of 1.0 m.
b) a 1.0-N weight is lifted a vertical distance of 10 m.
c) a 10-N weight is lifted a vertical distance of 1.0 m.
d) a 0.10-N weight is lifted a vertical distance of 100 m.
e) a 100-N weight is lifted a distance of 0.10 m.
13. List how much gravitational potential energy, in joules, each
of the weights in Question 12 above would have when lifted to the height listed for it.
14. What is the kinetic energy of a 62-kg cyclist if she is moving
on her bicycle at 8.2 m/s?
15. Compare and contrast Potential and Kinetic Energy? How are they similar and
how are they different?
16. A net force of 30.00 N acts on a 5.00-kg wagon that is initially at rest.
a) What is the acceleration of the wagon?
b) If the wagon travels 18.75 m, what is the work done on
the wagon?
20. A boat exerts a force of 417 N pulling a water-skier (m= 64.0 kg) from rest. The
skier’s speed is now 15.0 m/s. Over what distance was this force exerted?
21. When you sit on a chair, the seat of the chair pushes up on your body with a force
equal and opposite to your weight. How does the chair know exactly how hard to push
up on you—are chairs intelligent?
22. If a basketball player’s shoes provide an amount of friction that is “just right”
when she plays on her home court, can she be sure the same shoes will provide the
same amount of friction when playing on another court? Explain why or why not.
23. A cross-country skier who weighs 600 N has chosen ski wax that provides
μ = 0.03. What is the minimum amount of horizontal force that would keep the skier
moving at constant speed across level snow?
24. Suppose a running back collides with a defending linebacker who has just come
to a stop. If both players have the same mass, what do you expect to see happen in the
resulting collision?
25. Suppose that you have two baseball bats, a heavy (38-ounce) bat and a light (30ounce) bat.
a) If you were able to swing both bats at the same speed, which bat would allow you to
hit the ball the farthest distance? Explain your answer.
b) How fast would you need to swing the light bat to produce the same hitting effect as
the heavy bat? Explain your answer.
26. A 100.0-kg athlete is running at 10.0 m/s. At what speed would a 0.10-kg ball
need to travel in the same direction so that the momentum of the athlete and the
momentum of the ball would be equal?
27. What determines who will get knocked backward when a big hockey player checks
a small player in a head-on collision?
28. Use the words mass, velocity, and momentum to write a paragraph that gives a
detailed “before and after” description of what happens when a moving shuffleboard
puck hits a stationary puck of equal mass in a head-on collision.