Fluids and Dynamics - Section 8.1 Quiz

Which of the following forces is not a contact force?
1. Magnetic force
2. Tension force
3. Friction force
4. Elastic force
Which of the following forces is not an action-at-a-distance force?
1. Elastic force
2. Gravitational force
3. Electrostatic force
4. Magnetic force
A hair clip is held in place with a spring and the contact of the teeth of the clip with the hair.

Which two forces are most responsible for holding the hair clip in place?
1. Elastic, friction
2. Friction, tension
3. Elastic, tension
4. Elastic, gravitational
The mass of a large egg can be described as 150 g. Which of the following would most accurately describe the weight of the large egg?
1. 1.5 N
2. 15 N
3. 150 N
4. 15000 N
A hummingbird hovers without moving as it prepares to approach a feeder.

What is the most accurate description of all the forces acting on the hummingbird?
1. The forces are balanced.
2. The forces are unbalanced.
3. The forces are upward.
4. The forces are downward.
A swimmer jumps from a platform into a river below. As the swimmer falls, he travels faster and faster toward the water.

What is the most accurate description of all the forces acting on the swimmer?
1. The forces are unbalanced.
2. The forces are balanced.
3. The forces are upward.
4. The forces are downward.
An astronaut orbiting Earth stands on a bathroom scale, which reads zero. The most reasonable explanation for this is
1. there is very little gravitational force acting on the astronaut.
2. the astronaut's mass has decreased by going into space.
3. the forces acting on the astronaut are unbalanced.
4. the astronaut is standing on the moon.
A student rubs two balloons on their hair. When the balloons are dangled on strings near each other, they move closer to one another. The reason this movement occurs is because of
1. electrostatic force.
2. magnetic force.
3. gravitational force.
4. friction force.
Mass is best determined using a
1. balance scale.
2. force meter.
3. spring scale.
4. newton gauge.
Which of the following statements best describes the mathematical relationship between mass and weight?
1. Mass and weight are directly proportional (as mass increases, so does weight).
2. Mass and weight are inversely proportional (as mass increases, weight decreases).
3. Mass and weight are mathematically the same.
4. Mass is always one-half of weight.