Forces, acceleration, Newton's laws-BBC

Question 1

When will a skydiver be falling at a terminal velocity?

Answer 1

When air resistance is equal to the weight

Question 2

Why does opening a parachute slow down a skydiver?

Answer 2

Increased surface area increases air resistance

Question 3

What word describes the forces on an object moving a constant speed?

Answer 3

Balanced

Question 4

If a resultant force acts on an object, what happens to its motion?

Answer 4

Object accelerates at the same direction as the resultant force

Question 5

True or False:
In Newton’s 3rd law it states that the forces act on the same object

Answer 5

False; The forces act on two different objects. Each force exerts an equal and opposite force on the object.

Question 6

Why might air track be used in the acceleration experiments?

Answer 6

To reduce friction

Question 7

What is not a hazard in the acceleration experiments?

Answer 7

Burns from hot apparatus is not a hazard

Question 8

What is the relationship between acceleration and force?

Answer 8

Acceleration and force are directly proportional - as force doubles, acceleration also doubles.

Question 9

What is the relationship between acceleration and mass?

Answer 9

Acceleration and mass are inversely proportional - as mass doubles, acceleration halves.

Question 10

which of these would not increase braking distance:
Drinking alcohol,
driving faster,
road being too icy

Answer 10

Drinking alcohol