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?
A. 2 km/h
or
2 mph
2 km/h
What do Newton’s laws of motion study?
how forces cause and affect motion
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 best defines density?
a measure of the amount of mass in a given amount of space
Which of these factors affect gravitational force?
the distance between the objects
the mass of the objects
In which fields of science did Newton work?
How will the force of friction affect a woodblock being pushed over a table?
A. Friction acts in the opposite direction of motion, slowing the block down.
or
B.Friction acts in the opposite direction of motion but does not affect the motion of the object.
A. Friction acts in the opposite direction of motion, slowing the block down.
Which force is a field force?
electric force
How is density calculated?
by dividing mass by volume
The outer planets each have an orbital radius that is _[blank]_ Earth’s.
greater than
A person walks 12 miles in 3.0 hours.
What is the average speed of the person during this time?
A. 4.0 kilometers per hour
or
B. 4.0 miles per hour
4.0 miles per hour
If F1 has a magnitude of 7 N and F2 has a magnitude of 11 N, what is the net force acting on the box?
4 N backward
Which option correctly explains how an object affects a field?
An electric field affects a charged object.
What can be measured or observed without changing the chemical identity of the substance?
physical properties
How does the average temperature of the inner and outer planets compare?
The outer planets are significantly colder than the inner planets.
A train is moving at a speed of 40 km/h.
Which additional information would be required to determine the velocity of the train?
A.the time the train is traveling
or
B.the direction of the train
B. the direction of the train
A scientist has developed a material that is so slippery that it has zero friction.
If a hockey puck is moving on a mat made from this material, which option describes the puck's motion?
The puck will continue its motion in the same direction with the same velocity.
Object 1 carries a positive charge and is brought close to Object 2. Object 2 is attracted to Object 1.
Which option describes why Object 2 is attracted to Object 1?
Object 2 carries a negative charge.
Which of the following is a physical property?
reactivity
flammability
stability
boiling point
boiling point
It takes about 365 days for the Earth to do what?
complete one full orbit around the Sun
A car moves north at 12 miles per hour.
Which option describes if the given value is speed or velocity?
A.velocity, because there is a specific direction
or
B.velocity, because there is a mention of time
A.velocity, because there is a specific direction
A stationary 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 remain stationary.
Since magnetic force does not require contact, what type of force is it?
field
Which of the following is a physical property?
density
reactivity
pH
flammability
density
What occurs because the Sun has more mass and a stronger gravitational force than the Earth?
The Earth orbits the Sun.