For IEB Grade 11 Physics Practical Write Up. The aim being: Will the coefficients of kinetic and static friction remain constant when a constant wooden block is pulled over varied surfaces, when more mass is added to the constant wooden block, and when the angle of inclination of the surface is inc...
Investigative Question:
Overall:
Will the coefficients of kinetic and static friction remain constant when a constant wooden
block is pulled over varied surfaces, when more mass is added to the constant wooden
block, and when the angle of inclination of the surface is increased, provided that the block,
the surface and the spring balance used are kept constant throughout?
Experiment 1: Pulling block over varied horizontal surfaces to test for Static and Kinetic
Friction:
Will be coefficients of Kinetic and Static Friction remain constant as the same wooden block
is pulled over varied surfaces if the wooden block, the mass of the block and the spring
balance remain constant?
Experiment 2: pulling a block over a horizontal surface to test for Static and Kinetic Friction
whilst increasing the mass of the block:
Will the coefficients of kinetic and static friction remain constant or increase as the mass of
a wooden block is increased, if the surface, the wooden block and the spring balance are
kept constant?
Experiment 3: Pulling a block over a horizontal surface to test for Static and kinetic friction
when the angle of inclination is increased:
Will the coefficients of kinetic and static friction remain constant or decrease as the angle of
inclination of a surface is increased, if the surface and the wooden block are kept constant?
Aim:
Overall:
To determine the effect of different surfaces on the coefficient of static and kinetic friction,
the relationship between the normal force, maximum static friction and kinetic friction, and
the relationship between the angle of inclination of a slope and the coefficient of static
friction when the object (a wooden block), the surfaces and the spring balance used are
kept constant.
Experiment 1: Pulling block over varied horizontal surfaces to test for Static and Kinetic
Friction:
To determine the effect of different surfaces on the coefficients of kinetic and static friction
if the same wooden block is pulled over them, the mass of the block, and the spring balance
are kept constant.
Experiment 2: pulling a block over a horizontal surface to test for Static and Kinetic Friction
whilst increasing the mass of the block:
3
,Amy Wright Friction Write-Up
To determine the relationship between the normal force, maximum static friction and
kinetic friction when a constant wooden block is pulled over the same surface and the spring
balance is kept constant.
Experiment 3: Pulling a block over a horizontal surface to test for Static and kinetic friction
when the angle of inclination is increased:
To determine the relationship between the angle of inclination of a slope and the coefficient
of static friction if a constant wooden block is pulled over the horizontal force and then the
inclination of the surface is increased, if the wooden block and surface are kept constant.
Hypothesis:
Overall:
The coefficients of static and kinetic friction will vary as a wooden block is pulled over varied
surfaces, as the mass of the block increases and as an angle of inclination is applied. The
static friction will be greater than the kinetic friction if the surfaces, the wooden block and
the spring balance are kept constant. The coefficients of static and kinetic friction will be
greater on a rougher surface if the wooden block and spring balance are kept constant. The
coefficients of kinetic and static friction will increase as more mass is added to the block and
the surface is kept constant. The coefficient of the static friction on an inclined plane will be
less than the coefficient of static friction on the horizontal plane, if the surface and block are
kept constant.
Experiment 1: Pulling block over varied horizontal surfaces to test for Static and Kinetic
Friction:
The coefficients of static and kinetic friction will vary as the surfaces vary, the coarser the
surface, the greater the coefficient. The coefficients will be proportional, if the wooden
block, the ass of the block and the spring balance stays constant throughout.
Experiment 2: Pulling a block over a horizontal surface to test for Static and Kinetic Friction
whilst increasing the mass of the block:
The coefficients of static and kinetic friction will increase as the mass of the block and
therefore the normal force increases. The coefficients of static and kinetic friction for a
specific mass will be proportional, if the surface, the wooden block, and the spring balance
are kept constant.
Experiment 3: Pulling a block over a horizontal surface to test for Static and kinetic friction
when the angle of inclination is increased:
The static friction coefficient will decrease as the angle of inclination increases, if the
wooden block, the mass of the block, and the surface are kept constant.
4
, Amy Wright Friction Write-Up
Variables:
Overall:
Independent Variables:
- The surfaces that the block is placed on (a tennis court, concrete paving, a
painted desk and an upside-down lab desk).
Dependent Variables:
- The coefficients of kinetic and static friction.
- The normal force of the block on the surface.
Controlled Variables:
- The wooden block.
- The surface that the block is placed on (a tennis court, concrete paving, a painted
desk or an upside-down lab desk).
- The spring balance used.
Experiment 1: Pulling block over varied horizontal surfaces to test for Static and Kinetic
Friction:
Independent Variables:
- The surfaces that the wooden block is placed on (a tennis court, concrete paving
and a painted desk).
- The masses of the mass pieces added to the wooden block.
- The normal force of the block.
Dependent Variables:
- The coefficients of kinetic and static friction.
- The static and kinetic friction of the block on a specific surface.
Controlled Variables:
- The wooden block.
- The mass of the block.
- The spring balance used.
Experiment 2: pulling a block over a horizontal surface to test for Static and Kinetic Friction
whilst increasing the mass of the block:
Independent Variables:
- The masses of the mass pieces added to the wooden block.
Dependent Variables:
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