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WorksheetsFriction SBQ
Total questions: 19
Worksheet time: 10mins
What are 2 factors that determine the amount of friction between 2 objects?
Normal force and roughness between surfaces
hills and valleys and how smooth or rough the surface is
Amount of force and amount of surface the comes in contact
The force and the weight exerted on the surfaces
A block with a mass m = 5.0 kg slides down a ramp inclined at an angle Ɵ = 30° as shown below. The block accelerates at a rate of 2.0 m/s2.
Find the component of the block’s weight along the ramp.
Find the frictional force between the block and the ramp
Calculate the coefficient of kinetic friction.
Fgx = 25N
Ff = 15N
μ = 0.35
Fgx = 43N
Ff = 33N
μ = 0.35
Fgx = 43N
Ff = 33N
μ = 0.77
Fgx = 25N
Ff = 15N
μ = 0.77
A block with mass 2 kg is on a ramp inclined at 30° to the horizontal. A 5.0 N force of friction, Ff acts on the
block as it is pulled up the ramp at constant velocity with force F, which is parallel to the ramp, as shown in the diagram below.
Find the components of the block’s weight, both parallel to the incline and Perpendicular to the incline.
What is the magnitude of force F?
Sin 30 = 0.50
Cos 30 = 0.87
Fgx = 10 N
Fgy = 17.3 N
F = 15.0 N
Fgx = 17.3
Fgy = 10.0 N
F = 15.0 N
Fgx = 17.3
Fgy = 10.0 N
F = 22.3 N
Fgx = 10 N
Fgy = 17.3 N
F = 22.3 N
Two blocks, weighing 250N and 350N, respectively, are connected by a string that passes over a massless pulley as shown. The acceleration and tension in the string is:
a = 1.7 m/s2
T = 210N
a = 1.7 m/s2
T = 290N
a = 4.5 m/s2
T = 290 N
a = 4.5 m/s2
T = 210 N
A 15 kg mass is sliding along a frictionless floor with an acceleration of 5 m/s2. What is the magnitude of the net force acting on the mass?
15N
10N
20N
75N
The diagram below shows a box held stationary on a ramp by a string connected to a wall.
Which of the following relationship is true?
T = -Ff
T = WCosƟ + Ff
WSinƟ = T + Ff
T + Ff W
The diagram below shows a box held stationary on a ramp by a string connected to a wall.
Normal force = increases
Friction = Increases
Tension = Increases
Normal force = decreases
Friction = decreases
Tension = decreases
Normal force = increases
Friction = Increases
Tension = decreases
Normal force = decreases
Friction = decreases
Tension = Increases
The diagram below shows a sled and rider sliding down a snow-covered hill that makes an angle of 30° with the horizontal.
Which vector best represents the direction of the normal force, FN, exerted by the hill on the sled?
A heavy wooden block is dragged by a force F along a rough steel plate, as shown in the diagrams for two cases. The magnitude of the applied force F is the same for both cases. The normal force in (ii), as compared with the normal force in (i) is:
the same
greater
less
less for some angles of the incline and greater for others
A man pulls a 15 kg crate by using a rope, which makes an angle of 45° with the horizontal. The tension in the rope exerted on the crate is T = 120 N, and the coefficient of kinetic friction between the crate and the ground is 0.5.
Find the normal force exerted by the ground on the crate.
Find the frictional force between the crate and the ground.
Find the acceleration of the crate.
FN = 65N
Ff = 33N
a = 3.5 m/s2
FN = 33N
Ff = 65N
a = 3.5 m/s2
FN = 65N
Ff = 33N
a = 2.4 m/s2
FN = 33N
Ff = 65N
a = 2.4 m/s2
Which are true? Tick 2
Static friction is always greater than kinetic friction
Static friction is sometimes greater than kinetic friction
Both static and kinetic friction support motion
Both static and kinetic friction oppose motion
The graph below shows how the force of friction changes with the horizontal force applied on a box of mass 4 kg.
What is the magnitude of maximum static friction?
What is the magnitude of coefficient of static friction?
Fs = 20N
µs = 1/2
Fs = 5N
µs = 1/8
Fs = 20N
µs = 1/8
Fs = 5N
µs = 1/2
A child is pulled forward on a sled as shown in the figure below.
The magnitude of the normal force exerted by the ground on the sledge is __.
equal to the total weight of the child plus the sledge
greater than the total weight
less than the total weight
possibly greater than or less than the total weight, depending on the size of the weight relative to the tension in the rope
Which vector diagram best represents a cart speeding up as it travels to the right on a horizontal surface?
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