Mechanics End of Topic Quiz

Question 1

Select a reasonable estimate for the momentum of a person running along a straight and level path

Accepted Answer

350 kg m s⁻¹

Question 2

When are use of the SUVAT equations appropriate? For an object expericing...

Accepted Answer

... constant acceleration

Question 3

Which is the correct description of what happens after ball A collides elastically with larger ball B?

Accepted Answer

A rebounds at < v & B moves at < v

Question 4

There is always a force acting in the direction of motion?

Accepted Answer

False

Question 5

Which of Newton's Laws is this: "Objects remain at rest or move at a constant v unless acted on by net force"?

Accepted Answer

1st

Question 6

Select the correct definition of momentum

Accepted Answer

mass × velocity

Question 7

Select the equation that does not apply to inelastic collisions

Accepted Answer

B

Question 8

What is not conserved during an inelastic collision?

Accepted Answer

Kinetic energy

Question 9

Select an average force and duration combination that would bring a car with momentum of 5000 kg m s⁻¹ to rest

Accepted Answer

Force = 250 N, duration = 20 s, Force = 750 N, duration = 6.7 s, Force = 500 N, duration = 10 s

Question 10

Are the N and w forces in this diagram a Newton's third law pair? And why?

Accepted Answer

No, because they act on the same object

Question 11

Select the best description of what happens when the spring loaded plunger is released

Accepted Answer

Truck 2 moves off with one third of the speed of truck 1

Question 12

Select the only correct statement:

Accepted Answer

Objects remain at rest or move at a constant v unless acted on by net force

Question 13

Identify the equation which represents Newton's second law (assume F = resultant force)

Accepted Answer

F = ∆p/∆t

Question 14

A lift and its passengers (total mass = 500 kg), accelerate up at 2 m s-2. Assume that g = 10 m s-2.

Accepted Answer

6000N

Questions 14