CHAPTER 12. FORCE,MOMENTUM AND IMPULSE 12.3
Exercise 12 - 2
- A tug is capable of pulling a ship with a force of 100 kN. If two such tugs are pulling on one
ship, they can produceany force ranging froma minimum of 0 N to amaximum of 200 kN.
Give a detailed explanation of how this is possible. Use diagrams to support your result. - A car of mass 850 kgaccelerates at 2 m·s−^2. Calculate the magnitude of the resultant force that
is causing the acceleration. - Find the force needed to accelerate a 3 kg object at 4 m·s−^2.
- Calculate the acceleration of an object of mass 1000 kg accelerated by a force of 100 N.
- An object of mass 7kg is accelerating at 2,5m·s−^2. What resultant force acts on it?
- Find the mass of an object if a force of 40 N gives it an acceleration of 2 m·s−^2.
- Find the accelerationof a body of mass 1 000kg that has a 150 N force acting on it.
- Find the mass of an object which is accelerated at 3 m·s−^2 by a force of 25 N.
- Determine the acceleration of a mass of 24kg when a force of 6 Nacts on it. What is the
acceleration if the forcewere doubled and the mass was halved? - A mass of 8 kg is accelerating at 5 m·s−^2.
(a) Determine the resultant force that is causingthe acceleration.
(b) What acceleration would be produced if wedoubled the force and reduced the mass by
half?- A motorcycle of mass 100 kg is acceleratedby a resultant force of 500 N. If the motorcycle starts
from rest:
(a) What is its acceleration?
(b) How fast will it be travelling after 20 s?
(c) How long will it taketo reach a speed of 35 m·s−^1?
(d) How far will it travel from its starting point in 15 s?- A force of 40 N acting on a trolley on a frictionless horizontal plane causes an acceleration of
magnitude 6 m·s−^2. Determine the mass ofthe trolley. - A force of 200 N,acting at 60◦to the horizontal, accelerates a block of mass50 kg along a
horizontal plane as shown.
50 kg60 ◦
200 N
(a) Calculate the component of the 200 N forcethat accelerates the block horizontally.