18 Questions
A hockey puck is set in motion across a frozen pond. If ice friction and air resistance are neglected, the force required to keep the puck sliding at constant velocity is
none of these
The amount of force needed to sustain motion of a rock in outer space is
none of these
A constant net force on a railroad car produces constant
acceleration
If an object’s mass is decreasing while a constant force is applied to the object, the acceleration
increases
When you walk, you push on the floor to the left and the floor
pushes on you to the right
The force of friction on a sliding object is 10 N. The applied force needed to maintain a constant velocity is
10 N
A 10-N falling object encounters 4 N of air resistance. The net force on the object is
6 N
When a falling object has reached its terminal velocity, its acceleration is
0
A ball is thrown vertically into the air. Because of air resistance on the way up and on the way down, its speed when it returns to its starting level compared with its initial speed is
the same
Isaac Newton discovered
that gravity is universal
According to Isaac Newton, the greater the masses of interacting objects, the
greater the gravitational force between them
The difference between Newton's law of universal gravitation as a proportion and as an equation involves
the constant G
The gravitational constant G was first measured
after Newton's time
The force of Earth’s gravity on a capsule in space will lessen as it moves farther away. If the capsule moves to twice its distance, the force toward Earth becomes
one-fourth
The force of Earth’s gravity on a capsule in space increases as it comes closer. When the capsule moves to half its distance, the force toward Earth is then
four times greater
Your weight is the force
equal to your normal force on any surface
When you weigh yourself on a bathroom scale on a slight incline instead of a level surface, your weight reading on the scale will be
less
The concept of force is fundamental to
Newton's theory of gravitation
Study Notes
Forces and Motion
- No force is required to keep a hockey puck sliding at constant velocity on a frictionless surface.
- No force is required to sustain the motion of an object in outer space.
Constant Force and Acceleration
- A constant net force on an object results in constant acceleration.
- If an object's mass is decreasing while a constant force is applied, its acceleration increases.
Forces and Interactions
- When you walk, you push on the floor to the left, and the floor exerts an equal and opposite force on you.
- The force of friction on a sliding object is 10 N, and an applied force of 10 N is needed to maintain a constant velocity.
Gravity and Falling Objects
- A falling object encounters air resistance, which opposes its motion. If the object encounters 4 N of air resistance, the net force on the object is 6 N (10 N - 4 N).
- When a falling object reaches its terminal velocity, its acceleration is 0 m/s².
- Due to air resistance, a ball thrown vertically into the air returns to its starting level with a lower speed than its initial speed.
Newton's Law of Universal Gravitation
- Isaac Newton discovered the law of universal gravitation.
- According to Newton, the greater the masses of interacting objects, the greater the gravitational force between them.
- The difference between Newton's law of universal gravitation as a proportion and as an equation involves the gravitational constant G.
Gravity and Distance
- The force of Earth's gravity on an object in space decreases as the object moves farther away. If the object moves to twice its distance from Earth, the force toward Earth becomes 1/4 of its original value.
- The force of Earth's gravity on an object in space increases as it moves closer. If the object moves to half its distance from Earth, the force toward Earth doubles.
Weight and Gravity
- Your weight is the force of Earth's gravity on you.
- When you weigh yourself on a bathroom scale on an incline, your weight reading on the scale will be lower than on a level surface.
Fundamental Concept
- The concept of force is fundamental to understanding the natural world.
Test your understanding of force and motion with this quiz. Explore questions related to the force required to sustain motion, constant net force, accelerating objects, and friction on sliding objects.
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