Transcript Kahoot - mrhsluniewskiscience

Kahoot
Question 1
• A packing crate slides down an inclined ramp
at constant velocity. Thus we can deduce that
Question 1 Answer
• A packing crate slides down an inclined ramp
at constant velocity. Thus we can deduce that
• a frictional force is acting on it.
Question 2
• A toolbox, of mass M, is resting on a flat
board. One end of the board is lifted up until
the toolbox just starts to slide. The angle θ
that the board makes with the horizontal for
this to occur depends on the
Question 2 Answer
• A toolbox, of mass M, is resting on a flat
board. One end of the board is lifted up until
the toolbox just starts to slide. The angle θ
that the board makes with the horizontal for
this to occur depends on the
• coefficient of static friction, μ.
• Hint: The acceleration of gravity, g, cancels
out.
Question 3
• To avoid slipping while walking on ice, one
should take smaller steps because of the
Question 3 Answer
• To avoid slipping while walking on ice, one
should take smaller steps because of the
• Friction of ice is small
Question 4
• A force of 98 N is required to just start moving
a body of mass 100 kg over ice. Calculate the
coefficient of static friction.
Question 4 Answer
• A force of 98 N is required to just start moving
a body of mass 100 kg over ice.
• The coefficient of static friction is 0.1
• Use the equation for friction and make sure
the mass is converted to a force.
Question 5
• Which of the following statements is not true?
1. The force of friction acts opposite to the
applied force
2. Rolling friction is greater than sliding friction
3. The coefficient of friction between
wood&wood is less than 1
Question 5 Answer
• Which of the following statements is not true?
Rolling friction is greater than sliding friction
Question 6
• When there is no relative motion between
two surfaces, the force
Question 6 Answer
• When there is no relative motion between
two surfaces, the force
• exerted by one surface on the other is static
friction force
Question 7
Question 7 Answer
• 31 N
• Force of Friction = 40 kg x 9.8 m/s/s x 0.08 N
Question 8
Question 8 answer
Kinetic friction force
Question 9
Question 9 Answer
110 N - take coefficient times the normal force
Question 10
Question 10 Answer
Question 11
Question 11 answer
Question 12
Question 12 answer
equilibrant
Question 13
Question 13 answer
Question 14
Question 14 answer
Question 15
Question 15
Question 16
Question 16 answer
Question 17
• The resultant between 2 vectors can be found
by placing the vectors
Question 17 answer
• The resultant between 2 vectors can be found
by placing the vectors
• Tip to tail
Question 18
• Equilibrium can occur
Question 18 answer
• Equilibrium can occur
• only if the sum of the forces is zero.
Question 19
• The normal force on an object always act
Question 19 answer
• The normal force on an object always act
• perpendicular to the surface upon which
object is resting.