Unit 1
A person walks 3 kilometers in an hour, rests for an hour, and then walks 3 more kilometers in another hour.
What is the average speed of the person over the three hours?
2km/h
A moving object has two forces acting on it. The forces have the same magnitude but are in opposite directions.
What can be said about the motion of the object?
The object will continue to move with a constant velocity in the same direction.
Since magnetic force does not require contact, what type of force is it?
Field
Some hot liquid oil on a frying pan gradually cools down.
What kind of change happens as the oil cools?
Its temperature decreases.
When sugar is mixed with water, it fully dissolves. The resulting mixture is clear throughout and looks just like water.
What kind of mixture does this statement describe?
homogeneous
In which fields of science did Newton work?
Optics
Motion of objects
Gravity
A model rocket has an acceleration of 12 m/s2. A net force of 18 N is acting on the rocket. What is the mass of the rocket?
1.5 kg
A rower in a boat pushes the water backward using an oar.
What direction will the rower and the boat move?
Forward, because action-reaction forces are directed in opposite directions.
Which of the following is a physical property?
reactivity
density
pH
flammability
pH
This mixture is the same throughout. All parts of the mixture are similar to all other parts.
Which type of mixture does this description fit?
homogeneous
A person walks 12 miles in 3.0 hours.
What is the average speed of the person during this time?
4.0 miles per hour
A boat has a mass of 54,000 kg. The boat is accelerating at 0.4 m/s2. What is the net force acting on the boat?
21,600 N
A spaceship fires a movement thruster, releasing gases at high pressure.
What are the forces in the force pair for this example?
the force the gases apply to the ship
the force the ship applies to the gasses
What discovery did Hooke make about burning substances?
Burning involves a substance that is in air.
Which of the following best describes how the elements in the periodic table are ordered?
atomic distance
atomic radius
atomic charge
atomic number
atomic number
A ship sails north for 2 hours, traveling a total of 15 miles. Then the ship turns south and travels 6 miles in an hour.
If north is taken as the positive direction, what is the velocity of the ship?
3 miles per hour
A hockey puck is hit with a large force. The puck moves at a high speed as it slides over the ice.
What happens according to Newton’s first law of motion?
The puck gradually slows down because friction would be acting on it.
Which force is a field force?
electric force
When you blow into one end of a balloon, why does the whole balloon inflate?
The balloon inflates evenly because gas particles spread out to fill their container.
When colorless crystals of an unknown substance are mixed with water, they form a homogeneous mixture.
What would the mixture look like?
The crystals would not be visible in the mixture.
What term is defined as the distance and direction of an object’s change in position from its starting point?
Displacement
A toy train has a mass of 1.5 kg. A force of 3.0 N is acting on the train. What is the acceleration of the train?
2.0 m/s^2
How does energy from the sun heat up an object?
When sunlight strikes an object, some of the energy from the sunlight is absorbed by the object. This energy causes the particles of the object to move faster.
What can be measured or observed without changing the chemical identity of the substance?
physical properties
This mixture is not the same throughout. Some parts of the mixture are in different proportions than other parts of the mixture.
Which type of mixture does this description fit?
a heterogeneous mixture