Acceleration

What does speed measure?

• How fast an object is going

• How far an object has traveled

• The rate at which an object slows down

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What units are used to measure speed?

• Air pressure and gravity

• Units of distance per unit of time (like km/h)

• centimeters and inches

What is acceleration?

• The rate at which speed or direction changes

• The fastest speed that an object can reach

• A layer in the atmosphere

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Which of these is an example of acceleration?

• a car coasts along at 40 km/h

• a car speeds up from 40 km/h to 80 km/h

• a car is parked on the side of the road

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How is acceleration measured?

• in joules or Newtons

• in units of distance per unit of time squared

• in volts

• in units of mass multiplied by distance per unit of time

When an object slows down it is called...

• natural acceleration

• unacceleration

• negative acceleration

Which of these statements is false?

• Acceleration in the direction of motion slows you down.

• Acceleration in the direction of motion speeds up you.

• Acceleration against the direction of motion slows you down.

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When would acceleration increase the most?

• rolling along a flat plane

• rolling down a steep hill

• rolling up a gently sloping hill

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How does braking stop a bike?

• it makes the wheels turn backwards a few times

• it pumps up the tires slightly so they cannot roll forward

• it causes a quick negative acceleration against the bikes forward motion

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What variables must you know to calculate acceleration?

• distance and force

• change in speed and time

• speed and distance

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