Wgu C165 Unit 3
1. Consider two trains leaving a rail station, one moving to the west and the other to the east. Both are moving
at 1.0 m/s. Their speeds are: The same
2. Consider two trains leaving a rail station, one moving to the west and the other to the east. Both are moving
at 1.0 m/s. Their velocities are: different
3. The ball is initially moving down the ramp, with an increasing velocity. Which term describes its acceleration
at that instant? Which term describes the acceleration?: Acceleration by speeding up
4. The ball is initially moving up the ramp, with a decreasing velocity. Which term describes its acceleration at
that instant? Which term describes the acceleration?: acceleration by slowing down
5. The ball is at rest. Its velocity remains zero.
Which term describes its acceleration? Which term describes the accelera- tion?: no accelerating
6. The ball is initially rolling toward the wall and bounces off it to move at the same speed in the opposite
direction.
Which term describes its acceleration? Which term describes the accelera- tion?: acceleration by changing direction
7. Consider a block resting on a flat surface. When a force is applied to the block as shown, which arrow
shows the direction of the acceleration that results?: left arrow
8. Suppose the grocery cart is at rest, and you push it to accelerate it into motion. How does the result differ if
you pushed with a force of 40 N instead of 20 N for the same amount of time?
The cart ends up moving Hint, displayed below **BLANK** compared to be- fore.: faster
9. Suppose the grocery cart is at rest, and you push it to accelerate it into motion. How does the result differ if
you pushed with a force of 40 N instead of 20 N for the same amount of time?
Therefore, the larger force produced **BLANK** acceleration.: a larger
10.Suppose the grocery cart is at rest, and you push it to accelerate it into motion. How does the result differ if
you pushed with a force of 40 N instead of 20 N for the same amount of time?
The force on an object and the acceleration produced are **BLANK** related.-
: directly
, Wgu C165 Unit 3
11.How does the acceleration that results from the net force compare with the acceleration from just the 10 N
force?: The resulting acceleration is greater than than the acceleration produced by the 10 N force alone.
12.Suppose two equal forces pull on the box in opposite directions.Which of these is true about the net force
from two equal forces in opposite directions?-
: The net force is zero.
13.Suppose two equal forces pull on the box in opposite directions. Forces acting on an object that combine to
give zero net force are said to be balanced. Why would that term be appropriate?: They cancel each other and cause
zero acceleration.
14.Let's return to the coffee mug again. The force from the hand holding it exerts a force pushing it up. Its
weight exerts a force on it pulling it down. The two forces combine to produce a net force. Fill in the blank.
When the two forces are equal, the result is that the net force is **BLANK** and the cup does not move.: zero
15.Let's return to the coffee mug again. The force from the hand holding it exerts a force pushing it up. Its
weight exerts a force on it pulling it down. The two forces combine to produce a net force. Fill in the blank.
When you first exert extra force upward, the weight of the cup **BLANK**.: re- mains the same.
16.Let's return to the coffee mug again. The force from the hand holding it exerts a force pushing it up. Its
weight exerts a force on it pulling it down. The two forces combine to produce a net force. Fill in the blank.
The weight of the cup is less than the force from your hand and the net force on the cup is **BLANK**.: upward
17.Let's return to the coffee mug again. The force from the hand holding it exerts a force pushing it up. Its
weight exerts a force on it pulling it down. The two forces combine to produce a net force. Fill in the blank.
The result is that the cup accelerates **BLANK**.: upward
18.A spaceship is on a robotic mission to an outer planet of our solar system. Is it necessary for the spacecraft to
continue firing its engines to keep it moving toward its destination? Explain.: No. The spacecraft remains in motion
when no net force is acting on it.
19.NASA has used this same idea to "weigh" astronauts during space mis- sions. They developed a device in
which the astronaut glides back and forth by
1. Consider two trains leaving a rail station, one moving to the west and the other to the east. Both are moving
at 1.0 m/s. Their speeds are: The same
2. Consider two trains leaving a rail station, one moving to the west and the other to the east. Both are moving
at 1.0 m/s. Their velocities are: different
3. The ball is initially moving down the ramp, with an increasing velocity. Which term describes its acceleration
at that instant? Which term describes the acceleration?: Acceleration by speeding up
4. The ball is initially moving up the ramp, with a decreasing velocity. Which term describes its acceleration at
that instant? Which term describes the acceleration?: acceleration by slowing down
5. The ball is at rest. Its velocity remains zero.
Which term describes its acceleration? Which term describes the accelera- tion?: no accelerating
6. The ball is initially rolling toward the wall and bounces off it to move at the same speed in the opposite
direction.
Which term describes its acceleration? Which term describes the accelera- tion?: acceleration by changing direction
7. Consider a block resting on a flat surface. When a force is applied to the block as shown, which arrow
shows the direction of the acceleration that results?: left arrow
8. Suppose the grocery cart is at rest, and you push it to accelerate it into motion. How does the result differ if
you pushed with a force of 40 N instead of 20 N for the same amount of time?
The cart ends up moving Hint, displayed below **BLANK** compared to be- fore.: faster
9. Suppose the grocery cart is at rest, and you push it to accelerate it into motion. How does the result differ if
you pushed with a force of 40 N instead of 20 N for the same amount of time?
Therefore, the larger force produced **BLANK** acceleration.: a larger
10.Suppose the grocery cart is at rest, and you push it to accelerate it into motion. How does the result differ if
you pushed with a force of 40 N instead of 20 N for the same amount of time?
The force on an object and the acceleration produced are **BLANK** related.-
: directly
, Wgu C165 Unit 3
11.How does the acceleration that results from the net force compare with the acceleration from just the 10 N
force?: The resulting acceleration is greater than than the acceleration produced by the 10 N force alone.
12.Suppose two equal forces pull on the box in opposite directions.Which of these is true about the net force
from two equal forces in opposite directions?-
: The net force is zero.
13.Suppose two equal forces pull on the box in opposite directions. Forces acting on an object that combine to
give zero net force are said to be balanced. Why would that term be appropriate?: They cancel each other and cause
zero acceleration.
14.Let's return to the coffee mug again. The force from the hand holding it exerts a force pushing it up. Its
weight exerts a force on it pulling it down. The two forces combine to produce a net force. Fill in the blank.
When the two forces are equal, the result is that the net force is **BLANK** and the cup does not move.: zero
15.Let's return to the coffee mug again. The force from the hand holding it exerts a force pushing it up. Its
weight exerts a force on it pulling it down. The two forces combine to produce a net force. Fill in the blank.
When you first exert extra force upward, the weight of the cup **BLANK**.: re- mains the same.
16.Let's return to the coffee mug again. The force from the hand holding it exerts a force pushing it up. Its
weight exerts a force on it pulling it down. The two forces combine to produce a net force. Fill in the blank.
The weight of the cup is less than the force from your hand and the net force on the cup is **BLANK**.: upward
17.Let's return to the coffee mug again. The force from the hand holding it exerts a force pushing it up. Its
weight exerts a force on it pulling it down. The two forces combine to produce a net force. Fill in the blank.
The result is that the cup accelerates **BLANK**.: upward
18.A spaceship is on a robotic mission to an outer planet of our solar system. Is it necessary for the spacecraft to
continue firing its engines to keep it moving toward its destination? Explain.: No. The spacecraft remains in motion
when no net force is acting on it.
19.NASA has used this same idea to "weigh" astronauts during space mis- sions. They developed a device in
which the astronaut glides back and forth by
