Chapter 11 Motion

The SI unit for speed is

• mph

• ft/s²

• m/s

• Δv/t

Tags

NGSS.MS-PS3-1

A tug-of-war that results in one team pulling the other across the line is an example of

• action forces.

• reaction forces.

• balanced forces.

• unbalanced forces.

Tags

NGSS.MS-PS2-1

Which of the following statement is true?

• Frictional forces are greatest when both surfaces are rough.

• When a truck is parked on a hill, friction pulls the truck down the hill.

• Air resistance always opposes friction.

• Friction can exist between two objects even when they are not in contact.

An object is in motion when

• you observe the object move.

• that object's speed increases.

• the object's displacement is greater than the distance traveled.

• the object changes position relative to a stationary reference point.

How can the friction on a water slide be reduced?

• warm the surface of the slide

• keep the surface of the slide dry

• run a constant stream of water down the slide

• increase the slow of the slide

A car moving at an average speed of 55.0 mi/h for 4.25 h has traveled

• 0.08 mi.

• 13 mi.

• 55 mi.

• 234 mi.

On a distance vs. time graph of an object's motion, distance is usually

• plotted on the x-axis.

• greater than time.

• the dependent variable.

• measured in ft/min.

Tags

NGSS.MS-PS3-1

A pitcher throws a baseball to home plate, a distance of 60.5 ft. The ball reaches home plate in 0.63 s. What is the velocity of the ball?

• 38 ft/s

• 38 ft/s toward home place

• 96 ft/s

• 96 ft/s toward home plate

Tags

NGSS.MS-PS3-1

When the motion of an object is shown by a straight line on a distance vs. time graph with distance on the y-axis, the slope of the line is the

• distance traveled.

• displacement.

• speed.

• time of travel.

Peter runs in a constant direction on a straight road. The velocity vs. time graph of Peter's motion shows a straight line with a negative slope. What does the line tell you about Peter's speed?

• It is increasing.

• It is decreasing.

• It is decreasing, then increasing.

• It is constant.