Conceptual Physics Chapter 7 Question Preview (ID: 44248)
Physics.
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Is the following sentence true or false? If the action–reaction forces are internal to a system, then the forces cancel and the system does not accelerate.
a) true
b) false
c)
d)
Is the following sentence true or false? You cannot hit a wall any harder than the wall can hit you back.
a) true
b) false
c)
d)
Whenever an object exerts a force on another object, the second object exerts a force of the same magnitude, but in the opposite direction to that of the first object.
a) always true
b) sometimes true
c) always false
d)
Is the following sentence true or false? The trillions and trillions of interatomic forces that hold a baseball together do play a role in accelerating the ball.
a) true
b) false
c)
d)
Name the three factors that you must consider in order to understand why a cannonball moves much faster than the cannon when the cannonball is shot from the cannon.
a) Friction, Mass, Force
b) Force, Mass, Acceleration
c) Acceleration, Friction, Mass
d) Weight, Mass, Friction
Is the following sentence true or false? A rocket is propelled by the impact of exhaust gases against the atmosphere.
a) True
b) False
c)
d)
Is the following sentence true or false? In every interaction, the forces always occur in pairs.
a) true
b) false
c)
d)
A boulder falls off a cliff. What are the two interacting objects?
a) the boulder and the air
b) The boulder and the earth
c)
d)
As a car moves along a road, the tires of the car push backward against the road. What is the reaction?
a) The car moves
b) The road pushes forward against the tires.
c) The car stops
d)
Is the following sentence true or false? If you drop a pencil, the pencil pulls Earth upward with a much smaller force than that with which Earth pulls the pencil downward.
a) True
b) False
c)
d)
When a boulder falls off a cliff toward the ground, Earth accelerates toward the boulder. Which of the following that explains why we don’t sense this acceleration.
a) The boulder’s pull on Earth is much smaller than Earth’s pull on the boulder.
b) Earth’s huge mass causes its acceleration to be infinitesimally small.
c)
d)
Is the following sentence true or false? It doesn’t matter which force we call action and which we call reaction.
a) true
b) false
c)
d)
In order to make a cart move forward, a horse must pull harder on the cart than the cart pulls on the horse.
a) true
b) false
c)
d)
Whenever one object exerts a force on a second object, the second object always exerts the same amount of force back on the first object.
a) True
b) False
c)
d)
A force is always part of a(n) ______________that involves another force.
a) mutual action
b) direction
c) opposite
d) object
Define interaction
a) the rate of change of velocity per unit of time.
b) a mutual action between one thing and another
c) strength or energy as an attribute of physical action or movement.
d) a quantity or aggregate of matter usually of considerable size
A woman weighing 450N sits on the floor. She exerts a force on the floor of
a) 900N
b) 450N
c) 225N
d) 45N
Forces always occur
a) in pairs
b) in triplets
c) as single quantities
d) when velocities are constant
A 60-kg person on in-line skates pushes against a wall with a force of 30 N and recoils. What acceleration does that person experience?
a) .5 m/sec squared
b) 2 m/sec squared
c) 180 m/sec squared
d)
An unfortunate bug splatters against the windshield of a moving car. Compared to the force of the car on the bug, the amount of force of the bug on the car is
a) larger
b) the same
c) smaller
d)
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