Quiz on Friction and Mechanics

What happens if the surfaces have a low coefficient of friction?

• A lower normal reaction is needed

• A higher normal reaction is needed

• Frictional force decreases

• Frictional force remains constant

What is the angle of static friction?

• The angle between the normal reaction and the horizontal

• The angle between the normal reaction and the frictional force

• The angle between the frictional force and the horizontal

• The angle between the normal reaction and the vertical

What is the role of friction in transport systems?

• It is the enemy of efficiency

• It increases speed

• It reduces energy consumption

• It enhances power output

What is the relationship between coefficient of friction and frictional force?

• Higher coefficient means lower frictional force

• Higher coefficient means higher frictional force

• Coefficient does not affect frictional force

• Coefficient inversely affects frictional force

What happens when a box has four forces acting on it?

• The normal and frictional forces are subtracted

• The normal and frictional forces are added

• The normal and frictional forces are divided

• The normal and frictional forces are multiplied

What is the role of friction in engineering?

• It is always beneficial

• It is always harmful

• It is both beneficial and harmful

• It has no role

What is the formula for work?

• Work (W) = Force (F) x Displacement (s)

• Work (W) = Mass (m) x Gravity (g)

• Work (W) = Velocity (v) x Time (t)

• Work (W) = Power (P) x Time (t)

What is the unit for work?

• Newton (N)

• Joule (J)

• Watt (W)

• Meter (m)

What is potential energy considered as?

• Energy in motion

• Stored energy

• Energy of light

• Energy of sound

What is the formula for potential energy?

• PE = Mass (m) x Velocity (v)

• PE = Force (F) x Displacement (s)

• PE = Mass (m) x Gravity (g) x Height (h)

• PE = Power (P) x Time (t)