The diagram below shows a track, ABC. The curved section, AB, is frictionless. The rough horizontal section, BC, is 8 m long. 4 m -8 m- B. C An object of mass 10 kg is released from point A which is 4 m above the ground. It slides down the track and comes to rest at point C. 1.1.1 State the principle of conservation of mechanical energy in words. Is mechanical energy conserved as the object slides from A to C? Write only YES or NO. 1.1.2 1.1.3 Using ENERGY PRINCIPLES only, calculate the magnitude of the frictional force exerted on the object as it moves along BC.

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FS/2017
sical Sciences P1 (Physics) Gr 12
WORK, ENERGY AND POWER
ESTION 1
The diagram below shows a track, ABC. The curved section, AB, is frictionless. The
rough horizontal section, BC, is 8 m long.
4 m
8 m
B.
An object of mass 10 kg is released from point A which is 4 m above the ground. It
slides down the track and comes to rest at point C.
1.1.1
State the principle of conservation of mechanical energy in words.
1.1.2
Is mechanical energy conserved as the object slides from A to C? Write only
YES or NO.
1.1.3
Using ENERGY PRINCIPLES only, calculate the magnitude of the frictional
force exerted on the object as it moves along BC.
2.
A motor pulls a crate of mass 300 kg with a constant force by means of a light
inextensible rope running over a light frictionless pulley as shown below. The
coefficient of kinetic friction between the crate and the surface of the inclined plane is
0,19.
rope
motor
300 kg
25°
1.2.1
Calculate the magnitude of the frictional force acting between the crate and
the surface of the inclined plane.
The
Transcribed Image Text:19 FS/2017 sical Sciences P1 (Physics) Gr 12 WORK, ENERGY AND POWER ESTION 1 The diagram below shows a track, ABC. The curved section, AB, is frictionless. The rough horizontal section, BC, is 8 m long. 4 m 8 m B. An object of mass 10 kg is released from point A which is 4 m above the ground. It slides down the track and comes to rest at point C. 1.1.1 State the principle of conservation of mechanical energy in words. 1.1.2 Is mechanical energy conserved as the object slides from A to C? Write only YES or NO. 1.1.3 Using ENERGY PRINCIPLES only, calculate the magnitude of the frictional force exerted on the object as it moves along BC. 2. A motor pulls a crate of mass 300 kg with a constant force by means of a light inextensible rope running over a light frictionless pulley as shown below. The coefficient of kinetic friction between the crate and the surface of the inclined plane is 0,19. rope motor 300 kg 25° 1.2.1 Calculate the magnitude of the frictional force acting between the crate and the surface of the inclined plane. The
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