P10: Forces and Motion

Question 1

Link force, mass and acceleration with an equation?

Answer 1

Resultant force, F (N) = mass, m (kg) x acceleration, a (m/s2)

Question 2

Put weight, mass and gravitational field strength into an equation?

Answer 2

weight, W (N) = mass, m (kg) x gravitational field strength, g (N/kg)

Question 3

Put momentum, mass and velocity into an equation?

Answer 3

Momentum of a moving object, p (kg m/s) = mass, m (kg) x velocity, v (m/s)

Question 4

How do you work out acceleration?

Answer 4

Final velocity - initial velocity / time taken (m/s2)

Question 5

How do you work out the change of momentum?

Answer 5

Mass X Change of velocity. (kg m/s)

Question 6

How do you work out the impact force?

Answer 6

(mass x change of velocity) / time taken (N)

Question 7

What does stopping distance equal?

Answer 7

Thinking distance + braking distance (m)

Question 8

How do you work out force applied to a spring?

Answer 8

Force applied (N) = spring constant (N/m) X extension (m)

Question 9

What are the safety features of a car?

Answer 9

Crumple zones - increase the time taken for the car to stop
Seat belts stretch - increase the time taken for the wearer to stop
Air bags - the compressing air inside it slows you down more gradually than if you had just hit the hard dashboard
Bike helmets - increase the time taken for your head to stop in a crash
Crash mats - increase the time taken for you to stop if you fall on them