Acceleration - BrainPOP

What does speed measure?

• How fast an object is going

• How far an object has traveled

• The rate at which an object slows down

• The rate at which an object speeds up

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NGSS.MS-PS3-1

Which of the following can be used to measure an object's speed?

• Joules

• Newtons

• Miles per hour

• Kilometers per second per second

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NGSS.MS-PS3-1

What does acceleration measure?

• How fast an object is going

• The fastest speed that an object can reach

• The force with which an object travels

• The rate at which speed or direction changes

What is the difference between positive and negative acceleration?

• Positive acceleration applies to fast objects; negative acceleration applies to slow objects.

• Positive acceleration occurs when objects speed up; negative acceleration occurs when objects slow down.

• Positive acceleration applies to objects traveling on earth; negative acceleration applies to objects traveling in space.

• Positive acceleration is expressed in meters per second; negative acceleration is expressed in kilometers per hour.

Which of these is an example of acceleration?

• A car coasts along at 40 km/hr

• A car is parked on the side of the road

• A speeding car brakes to a stop

• A car speeds along at 100 km/hr

Which of these statements is true?

• Acceleration in the direction of motion slows you down

• Acceleration in the direction of motion speeds you up

• Acceleration against the direction of motion has no effect on your speed

• Acceleration against the direction of motion speeds you up

If you're sitting still in a chair reading this, what is your acceleration?

• 0 m/s²

• 2 m/s²

• 1 m/s²

• -1 m/s²

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NGSS.MS-PS2-2

When would acceleration increase most?

• Rolling along a flat plane

• Rolling down a steep hill

• Braking to a stop

• Rolling up a gently sloping hill

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NGSS.MS-PS2-2

How does braking stop a bike?

• It makes the wheels turn backwards a few times

• It pumps the tires with air so that they cannot roll forward

• It causes a quick negative acceleration against bike's forward motion

• It causes a quick positive acceleration against the bike's backward motion

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NGSS.MS-PS2-2

You're in a moving car. Which of the following changes would always mean there's been some acceleration?

• A change in temperature

• A change in time

• A change in location or position

• A change in speed or velocity