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WorksheetsEM_FRICTION
Total questions: 20
Worksheet time: 21mins
Friction _____________ motion
Works in the same direction as
Opposes
Has not effect on
Pulls against
Which type of friction keeps objects from sliding around all over the place
Static Friction
Rolling Friction
Fluid Friction
Sliding Friction
Imagine you decide to jump out of an airplane 🛩
Which force is going to pull you down towards earth
Fluid Friction
Static Friction
Gravity
The wind from the airplane
When you go down a slide which two forces are competing in a tug of war?
Gravity and Sliding Friction
Gravity and Rolling Friction
Gravity and Your Friend Pushing You
Gravity and Pushing Friction
Frictional force depends on ____
surface area in contact
roughness of surface
both a and b
none of the above
Which of these best describes friction?
A rubbing force.
Something that is slippery.
Gravity.
Movement across a smooth surface.
The coefficient of kinetic friction is ____________ than coefficient of static friction.
Smaller
Larger
Significantly larger
Highly larger
A block weighing 981 N is resting on a horizontal surface. The coefficient of friction between the block and the horizontal surface is μ=0.2. A vertical cable attached to the block provides partial support. A man can pull
horizontally with a force of 100 N. What will be the
tension, T (in N) in the cable if the man is just able to move the block to the right?
481 N
841 N
981 N
98.1 N
The relation between angle of friction & coefficient of friction is expressed as -----------
tan φ=μ
tan μ = φ
cos φ=μ
sin φ=μ
The angle made by the resultant of the normal reaction & the limiting force of friction with the normal reaction is known as --------------------
angle of limiting force
angle of cone
angle of resultant
angle of friction
At what conditions the dry friction occurs between the surfaces in contact?
When there is no lubricating fluid
When there is no friction fluid
When there is no adhesive fluid
When there is no cohesive fluid
If a ladder is leaniing against a smooth vertical wall, the force of friction between ladder & vertical wall will be equal to --------------(φ- angle of friction, θ - angle between ladder and wall)
tan φ
infinity
tan θ
zero
If a normal force and a frictional force realized on rough surface are 50N and 12 N respectively, the coefficent of friction is
0.024
0.34
0.14
0.24
The angle of the inclined plane at which the body just begins to slide down the plane, is called ----------------
plane angle
angle of slide
angle of repose
friction angle
The angle made by the resultant of the normal reaction & the limiting force of friction with the normal reaction is known as --------------------
angle of limiting force
angle of cone
angle of resultant
angle of friction
