5.2 Braking distance Work-energy theorem

When you increase your speed in your vehicle, your braking distance _____.

• increases

• decreases

• remains constant

When you lift an object at a constant speed, the net work done on the object is ____.

• less than 0

• greater than 0

• 0

• more information is needed

Net work is equal to ______.

• force divided by displacement

• change in kinetic energy

• kinetic energy

• change in potential energy

When you double your speed in your vehicle, your braking distance _____.

• quadruples

• doubles

• triples

• nonuples (9x)

• gets divided by 4

If the net work is 0, the change in kinetic energy is ____.

• 0

• less than 0

• greater than 0

• more information is needed

If you go from 60 mph to 30 mph, your braking distance will _____.

• quadruple

• be divided by 2

• triple

• nonuples (9x

• be divided by 4

If you go from 30 mph to 60 mph, your braking distance will _____.

• quadruple

• double

• triple

• nonuples (9x)

• be divided by 4

If you go from 40 mph to 80 mph, your braking distance will _____.

• quadruple

• double

• triple

• nonuples (9x)

• be divided by 4

If your braking distance at 40 mph is 12 m, what is your braking distance at 80 mph?

• 48 m

• 3 m

• 24 m

• 36 m

• 108 m

Answer explanation

Double speed = 4 x distance

If your braking distance at 20 mph is 6 m, what is your braking distance at 40 mph?

• 48 m

• 3 m

• 24 m

• 36 m

• 108 m

Answer explanation

Double speed = 4 x distance