# Dynamics Part One Online Test

The graph shown below relates how the force acting on an object varies with time during a collision.

The area under the graph represents

the object&apos;s change of

F

t

The force acting on an object

varies as shown on the right. If

the mass of the object is 4 kg,

and it is initially at rest, find its

momentum at 8s.

force/N

t/s

2 4 6

0

20

8

When an object is falling freely under gravity its rate of change of momentum is equal to its:

Four objects A, B, C, and D, each of 1 kg are connected together by inextensible strings and pulled by a force of 10 N as shown.

10 N

A

B

C

D

Find the force exerted by B on C.

smooth

surface

A helicopter of mass 3,500 kg rises vertically with a constant velocity of

15 m/s. Find the net force acting on the helicopter

A machine gun fires bullets , each of mass m, onto a vertical wall at a rate of n bullets per second. If the speed of each bullet is v and they rebound from the wall at the same speed, find an expression for the average force exerted on the wall.

When a person is standing in a lift which is accelerating upwards, the magnitude of the force exerted on the man&apos;s feet by the floor is always:

Newton&apos;s third law discusses the forces of interaction between two objects. The following statements relate to the action and reaction forces in Newton&apos;s third law. Identify the incorrect statement.

Find the rate of change of momentum on a body if a force of 5 N were acting on it for a period of 3 s.

Two objects, P and Q of masses 3 kg and 7 kg respectively are accelerated along a horizontal surface by a force of 5 N as shown.

P Q

3kg 7kg

5 N

Find the magnitude of the force on P due to Q during this acceleration.

Description:

This test is for students who need a firm foundation in Physics.
Particularly suited for students attempting the Singapore-Cambridge Advanced Level Physics Examinations. Sub-toics includes Newton's Laws of Motion, Momentum, Principle of Conservation of momentum, free-body diagrams. Students are expected to have a good knowledge of scalars, vectors and kinematics in one dimension.

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