Name______Due______
Friction Part 21
1.Draw a free body diagram of a skier going down a slope. Include all forces.
2. An 8.0-newton block is accelerating down a
frictionless ramp inclined at 15° to the horizontal,
as shown in the diagram below.
What is the magnitude of the net force causing
the block’s acceleration?
What is the normal force?
What is the mass of the block?
What if there is friction? Which direction would it go? Which force would it act against? Draw it in the free body diagram.
If the force of friction is 1.5N, what is the resultant force?
What is the coefficient of friction?
What is the acceleration of the block now?
6. A force is applied to a block on a horizontal surface.
The coefficient of static friction is 0.3 and the block weighs 10N. A force of 2N is applied to the right, but the block does not move. What is the force of friction? What is the highest force that can be applied before the block will move? What is the force of friction then?
3. A block weighing 10.0 newtons is on a ramp
inclined at 30.0° to the horizontal. A
3.0-newton 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.
What is the magnitude of force F?
What is thecoefficient of friction?
4. A 62kg person on skis is going down a hill sloped at 37degrees. The coefficient of kinetic friction between the skis and snow is 0.15. What is the acceleration of the skier? How fast is the skier going after 5.0 sec?
5. Anna who had a mass of 45kg starts down a slide that is inclined at an angle of 45 degrees. If the coefficient of kinetic friction between her shorts and the slide is 0.25, what is her acceleration?