Physics Chapter 5 Homework #1
Terms in this set (18)
When you push against a wall with your fingers, they bend. Identify the force or forces involved.
You exert an action force and the wall exerts an equal and opposite reaction force.
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?
The boxer can only hit the tissue paper with a force as large as the tissue paper can exert on the boxer, and the low-mass tissue can only exert a weak force.
How many forces are required for an interaction?
Two forces, an action and a reaction, are needed for an interaction.
The action is: Earth pulls on Moon. What is the reaction?
Moon pulls on Earth.
Which force is greater, the Earth's pull on the Moon, or the Moon's pull on the Earth?
Both pulls are the same.
If the cannon's recoil is the result of an equal and opposite reaction, why is the cannon's acceleration lower than the shell's acceleration?
The cannon has more mass than the shell.
Since movement of an object or system requires that a net force be applied to it, how can this occur if all action forces have opposite and equal reaction forces?
The action force doesn't act on the same object as the reaction force.
In Lesson 3 of the tutorial, the horse is pulling a cart. What allows the horse to accelerate forward even though the cart is pulling back on the horse?
The force of friction the ground exerts on the horse is larger than the force the cart is pulling back on the horse.
Which of the following is NOT a statement or consequence of Newton's third law?
There can never be only one force acting on an object.
State Newton's third law of motion.
For every action there is an equal and opposite reaction.
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 by the ball on the bat.
If the system of (Figure 1) is only the orange, is there a net force on the system when the apple pulls?
Yes, there is the action of the apple on the orange.
If the system is considered to be the apple and the orange together (Figure 1) , is there a net force on the system when the apple pulls (ignoring friction with the floor)?
The net force is zero because the action and reaction forces are equal and opposite.
To produce a net force on a system, must there be an externally applied net force?
Yes, there must be an external net force on the system.
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?
If you kick it, there is a net force; if both of you kick it, there is not.
How does the force on the rifle compare with the force on the bullet, and why?
The magnitude of the force of the rifle is equal to the magnitude of force on the bullet and the forces are in the opposite direction, because for every action there is an equal and opposite reaction.
How does the magnitude of acceleration of the rifle compare with the magnitude of acceleration of the bullet, and why?
The acceleration of the rifle is smaller than the acceleration of the bullet. They experience the same magnitude of force, but the mass of the rifle is greater, and so the rifle will experience a smaller acceleration than the bullet.
How does the distance traveled by the bullet compare with the distance traveled by the rifle in the same time, and why?
The bullet will travel farther than the rifle because it has a greater magnitude of acceleration.
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