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Ch. 11 Study Guide
Important terms/concepts – make sure you know the definitions and how to apply the following:
inertia
Newton’s 1st Law of Motion
constant motion
net force
Newton’s 2nd Law of Motion
force
mass
acceleration
direct relationship
indirect relationship
free fall
forces
terminal velocity
projectile motion
horizontal motion
vertical motion
gravity
weight
mass
Newton’s Law of Universal Gravitation
force
mass
distance
direct relationship
indirect relationship
motion in space
Newton’s 3rd Law of Motion
action force
reaction force
cancellation of forces
momentum
mass
velocity
conservation of momentum
elastic collisions
inelastic collisions
Sample questions:
1. What is the difference between mass, volume, and weight?
2. What happens to an object in motion when it experiences a net force?
3. Describe the possible motion of a vehicle that has a net force of 0 N.
4. Mrs. Butte, a famous salsa dancer, has a mass of 45.0 kg. What is her mass on Earth? What
is her weight on Earth?
5. Describe the motion of a falling object in the presence of air. Include velocity, terminal
velocity, acceleration, air resistance, weight, and net force.
6. Contrast direct and inverse relationships. Give examples of each.
7. Calculate the acceleration of a 20-kg dodo bird just before takeoff when the total thrust of its
wings is 50N.
8. Calculate the acceleration of a 5-kg box when you push with a 12-N horizontal force along a
horizontal floor having a frictional force of 2-N.
9. Explain why the accelerations caused by an action force and by a reaction force do/do not
have to be equal.
10. Explain why action/reaction force pairs do not cancel.
11. Explain how a rocket can move in space even though there is no air for the exhaust to push
on.
12. Explain why two objects, one thrown to the side and another dropped, from the same height
will/will not land at the same time.
13. Be able to figure the speeds of a ball (horizontal and vertical) and the distance from the
ground throughout its thrown path.
14. Be able to draw action/reaction pairs for 1-, 2-, and 3-force pictures.
15. When Mark McGuire stepped up to the plate and hit a 0.15 kg tee-ball sitting on the tee. The
impact caused the ball to leave his bat with a velocity of 25.0 m/s. What momentum did
McGuire transfer to the tee-ball?
16. Batman, Jr., a 15.0 kg superhero, shoots his 0.05 kg grappling hook toward the rooftop with a
speed of 15 m/s in hopes he can evade Dr. Evil. How fast does B.J. move backwards, when
his hook is shot? (Backward inelastic) Hint: To start, B.J. and the hook are together and both
are at rest.