Question

Question 1 (1 point)
A car travels 40 miles north in the first 40 minutes of a trip. The same car travels 30 miles west in the next 30 minutes of the trip. What can be said about the motion of the car?

a
The car is decreasing its speed.
b
The car is accelerating at a constant rate.
c
The car is moving at a constant velocity.
d
The car is traveling at a constant speed.
Question 2 (1 point)
While at soccer practice, Abbey runs down the field at 10 meters per second. She has a constant speed and does not change direction.

What is Abbey's acceleration?

a
The acceleration is 10 m/s2 because her velocity did not change.

b
The acceleration is 0 m/s2 because her velocity did not change.

c
The acceleration is 10 m/s2 because her velocity increased.

d
The acceleration is 0 m/s2 because her velocity increased.

Question 3 (1 point)
A student places a cold metal nail in a cup of hot water for five minutes. When she removes the nail from the water, it feels warmer. How does the hot water affect the motion of the metal atoms in the nail?

a
It causes the atoms to vibrate slower.
b
It causes the atoms to vibrate faster.
c
It causes the atoms to move closer together.
d
It causes the atoms to stop moving at all.
Question 4 (1 point)
Shelly wants to find the speed that her dog can run.

What should Shelly do?

a
measure the size of the dog and the distance it runs
b
measure the time the dog runs
c
measure the time it takes for the dog to run a certain distance
d
measure the distance the dog runs
Question 5 (1 point)
A student wants to show the transfer of heat energy without matter. Which investigation design would best help the student?

a
an investigation of conduction through collisions between particles in space
b
an investigation of radiation through electromagnetic waves
c
an investigation of radiation through a current in a fluid
d
an investigation of conduction through the movement of particles through a solid
Question 6 (1 point)
Two objects are sitting on a table. Thermal energy is being transferred from one object to another.

When does this transfer of thermal energy stop?

a
when the two objects are different temperature
b
when one object is much warmer than the other
c
when both objects are the same temperature
d
when one object has completely cooled

Answer 1

1. d — The speed (magnitude) stays the same, but direction changes so velocity is not constant.
2. b — Acceleration = 0 m/s² because her velocity (speed and direction) did not change.
3. b — The hot water makes the metal atoms vibrate faster (their kinetic energy increases).
4. c — Measure the time it takes to run a known distance, then compute speed = distance/time.
5. b — Radiation via electromagnetic waves transfers heat without matter.
6. c — Heat transfer stops when both objects are at the same temperature (thermal equilibrium).