RADT PHYSICS CONCEPTS CHAPTER4
EXPLAINING MOTION TEST BANK KEY
EXAM WITH ACCURATE ANSWERS.
All except one of the following require the application of a net force. Which
one is the exception?
a. changing an object from a state of rest to a state of motion
b. maintaining an object in motion at constant velocity
c. changing an object's speed without changing its direction of motion
d. maintaining an object in uniform circular motion
e. changing an object's direction of motion without changing its speed -
CorreCt Answers -b. maintaining an object in motion at a constant velocity
When a net horizontal force of 200 N acts on a 50-kg cart that is free to roll
on a level surface - CorreCt Answers -the cart accelerates at 4m/s^2.
A child, whose weight is 150 newtons, lifts a pumpkin from the ground with
a force of 50 newtons. The force the pumpkin exerts on the child is -
CorreCt Answers -50 newtons.
A certain force causes a 50 kg person to accelerate at 1.0 m/s^2. The same
force applied to a 75-kg person would cause - CorreCt Answers -a smaller
acceleration.
You stand on a scale to measure your weight. The reaction to the force the
Earth exerts on you is - CorreCt Answers -the force you exert on the Earth.
, The surface gravity of Mars is 3.7 m/s^2. If a person with mass of 100 kg
were parachuting on Mars, what would be the force exerted by air
resistance at terminal velocity? - CorreCt Answers -370 N.
A dog weighs 250 N. What is his approximate weight in pounds (lb)? -
CorreCt Answers -55 lb.
The force exerted on a body by moving air is proportional to the projected
area of the body. Which falling body will have the larger terminal velocity, a
flying squirrel with its wing membranes extended or a grey squirrel with the
same mass? - CorreCt Answers -The grey squirrel.
Your weight is 100 lb. Suppose you are standing on a scale in an elevator
moving up with a constant speed of 3 m/s. What would be the reading on
the scale? - CorreCt Answers -100 lb.
Your mass is 50 kg. Suppose you are standing on a scale in an elevator that
starts moving up and increases its speed at the rate of 2 m/s every second.
What would be the reading on the scale? - CorreCt Answers -590 N.
Your mass is 50 kg. Suppose you are standing on a scale in an elevator that
is approaching a top floor and decreasing its speed at the rate of 2 m/s
every second. What would be the reading on the scale? - CorreCt Answers -
390 N
Consider two blocks, one made of wood and the other of lead. They have the
same dimensions but the lead is much more massive. If they are dropped
and fall long enough to reach terminal velocity, which block experiences a
larger force from air resistance? - CorreCt Answers -The lead block.
EXPLAINING MOTION TEST BANK KEY
EXAM WITH ACCURATE ANSWERS.
All except one of the following require the application of a net force. Which
one is the exception?
a. changing an object from a state of rest to a state of motion
b. maintaining an object in motion at constant velocity
c. changing an object's speed without changing its direction of motion
d. maintaining an object in uniform circular motion
e. changing an object's direction of motion without changing its speed -
CorreCt Answers -b. maintaining an object in motion at a constant velocity
When a net horizontal force of 200 N acts on a 50-kg cart that is free to roll
on a level surface - CorreCt Answers -the cart accelerates at 4m/s^2.
A child, whose weight is 150 newtons, lifts a pumpkin from the ground with
a force of 50 newtons. The force the pumpkin exerts on the child is -
CorreCt Answers -50 newtons.
A certain force causes a 50 kg person to accelerate at 1.0 m/s^2. The same
force applied to a 75-kg person would cause - CorreCt Answers -a smaller
acceleration.
You stand on a scale to measure your weight. The reaction to the force the
Earth exerts on you is - CorreCt Answers -the force you exert on the Earth.
, The surface gravity of Mars is 3.7 m/s^2. If a person with mass of 100 kg
were parachuting on Mars, what would be the force exerted by air
resistance at terminal velocity? - CorreCt Answers -370 N.
A dog weighs 250 N. What is his approximate weight in pounds (lb)? -
CorreCt Answers -55 lb.
The force exerted on a body by moving air is proportional to the projected
area of the body. Which falling body will have the larger terminal velocity, a
flying squirrel with its wing membranes extended or a grey squirrel with the
same mass? - CorreCt Answers -The grey squirrel.
Your weight is 100 lb. Suppose you are standing on a scale in an elevator
moving up with a constant speed of 3 m/s. What would be the reading on
the scale? - CorreCt Answers -100 lb.
Your mass is 50 kg. Suppose you are standing on a scale in an elevator that
starts moving up and increases its speed at the rate of 2 m/s every second.
What would be the reading on the scale? - CorreCt Answers -590 N.
Your mass is 50 kg. Suppose you are standing on a scale in an elevator that
is approaching a top floor and decreasing its speed at the rate of 2 m/s
every second. What would be the reading on the scale? - CorreCt Answers -
390 N
Consider two blocks, one made of wood and the other of lead. They have the
same dimensions but the lead is much more massive. If they are dropped
and fall long enough to reach terminal velocity, which block experiences a
larger force from air resistance? - CorreCt Answers -The lead block.
