Unit 7 Review

A duck flies 60 meters in 10 seconds. What is the ducks speed?

(speed = distance / time)

• 600 m/s

• 50 m/s

• 6 m/s

• 70 m/s

What unit do scientists use to measure force?

• Newton

• Gram

• Kilogram

• Meter

What is velocity?

• same as speed

• speed in a given direction

• miles per hour

• change in speed over time

Friction acts in a direction ______ to the direction of an object’s motion.

• unrelated

• opposite

• equal

• perpendicular

Which is the best definition of acceleration?

• change in velocity

• change in reference point

• increase in speed

• decrease in speed

Unless an object at rest is acted upon by an unbalanced force, it stays at rest due to its ______.

• matter

• inertia

• friction

• gravity

The moon has a smaller mass than the Earth. If you were able to travel to the moon your weight would __________.

• increase

• decrease

• stay the same

• vary with day and night

Jupiter has about 317 times more mass than Earth. What can you infer from this fact? 

• That Jupiter’s gravitational force is much weaker than on Earth’s Gravitational force

• That Jupiter’s gravitational force is much stronger than Earth’s gravitational force.

• That Jupiter’s and Earth’s gravitational forces are equal.

  That Jupiter’s and Earth’s gravitational forces are equal.

• Mass has no effect on the gravitational force between two objects.

This laptop is sitting at rest on your desk. Which of the following statements best describes this situation?

• No forces are acting on your laptop

• Your laptop pushes on the desk only.

• The forces acting on the laptop are unbalanced.

• The forces acting on the laptop are balanced.

The amount of gravity between two objects depends on their masses and the

• distance between them

• friction between them

• total velocity of the objects

• density of the objects