8th Grade Speed, Acceleration, Forces

Which unit is used to measure distance?

• grams

• seconds

• milliliters

• centimeters

In a swimming race, Sam swam the first 50m in 42 s. She swam the second 50m in 40 s. What was Sam's average speed during the race?

• .82 m/s

• 1.19 m/s

• 1.22 m/s

• 1.25 m/s

Which scenario does not describe an example of acceleration?

• A car increases its speed while turning to the left.

• A car decreases speed while its driving straight ahead.

• A car maintains a constant speed while turning to the right.

• A car maintains a constant speed while driving straight ahead.

Which are the SI units for acceleration?

• N

• m/s

• m/s squared

• kg*m/s

Tags

NGSS.HS-PS2-1

Which of the following is an example of acceleration?

• A boat sits on a boat trailer.

• A car moves in a straight line at 60 km/hr.

• A plane moves in air at a steady speed of 850 km/hr.

• A bus moves on a straight road and then makes a right turn.

Rebecca conducted an experiment with a radio controlled car. From rest, the car went 20 m/s and ended at 30 m/s in 2 seconds. What is the average acceleration?

• 5 m/s squared

• 10 m/s squared

• 15 m/s squared

• 20 m/s squared

Do you know how to find the net force?

• Yes!

• No :(

• Somewhat, need to study.

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

Which is a contact force?

• the force between two magnets

• the gravitational pull of a planet

• friction between an object and air

• the force between two charge particles

The measure of how far something moves in a given amount of time

Tags

NGSS.MS-PS3-1

Change in position over time