Physics 100-Chapter 5
Terms in this set (16)
1. When you push against a wall with your fingers, they bend because they experience a force. Identify this force.
-the force of the wall pushing back on your fingers
2. A boxer can hit a heavy bag with great force. Why can't he hit a piece of tissue paper in midair with the same amount of force?
-because there is not enough mass in the tissue paper to react to the force of the punch by the boxer
3. How many forces are required for an interaction?
4. State Newton's third law of motion.
-Whenever one object exerts a force on a second object, the second object exerts an equal and opposite force on the first or, to put it simply: to every action there is always an opposed equal reaction
5. Consider hitting a baseball with a bat. If we call the force on the bat against the ball the action force, identify the reaction force
-the reaction force is the force of the ball against the bat
6. If the system of only the orange (in a cart), is there a net force on the system when the apple pulls?
-yes, there is the action of the apple on the orange
7. If the system is considered to be the apple and the orange together, is there a net force on the system when the apple pulls (ignoring friction on the floor)?
-no, the pair of forces is internal to the apple-orange system
8. To produce a net force on a system, must there be an externally applied net force?
-yes, there must be an externally applied force
9. Consider the system of a single football. If you kick it, is there a net force to accelerate the system? If a friend kicks it at the same time with an equal and opposite force, is there a net force to accelerate the system?
-yes; the net force is provided by contact with your foot. If two opposite and equal forces act on the ball, the net force on it is zero and it will not accelerate
10. Earth pulls down on you with a gravitational force that you call your weight. Do you pull up on the Earth with the same amount of force?
11. If the forces that act on a cannonball and the recoiling cannon from which it is fired are equal in magnitude, why do the cannonball and cannon have very different acceleration?
-the cannon has more mass than that of the cannonball making its acceleration less
12. Identify the force that propels a rocket.
-the rocket is propelled by the reaction force exerted by the material it fires
13. How does a helicopter get its lifting force?
-the helicopter gets its lifting force by pushing air downward, in which case the reaction is the air pushing the helicopter upward
14. Can you physically touch a person without that person touching you with the same amount of force?
19. Fill in the blanks: Newton's first law is often called the law of _______________; Newton's second law is the law of _______________; and Newton's third law is the law of _______________ and _______________.
-inertia, acceleration, action-reaction
20. Which of Newton's three laws focuses on interactions?
-Newton's third law
YOU MIGHT ALSO LIKE...
MCAT Physics | Kaplan Guide
Physics Chapter 5 Reading Check Questions and Answers
Physics Ch. 5
Newton's 3rd Laws of Motion--Action/Reaction
OTHER SETS BY THIS CREATOR
MIS 111 Lab Final
ASL 3 Unit 14
World Geography Chapter 3 & 4
chp 6 - homework questions