Friction SBQ

Front

What type of friction is not moving? Options: static, sliding, fluid, rolling

Back

static

Front

Which of the following is an example of friction that is helpful? Options: Brakes used on a bike, Tires from a car on the road, Tread on the bottom of your shoes, All are examples that are helpful

Back

All are examples that are helpful

Front

Which of the following is an example of friction that is harmful? Options: Pencil marking on paper, Engine parts wearing out, sand placed on ice in the winter, Using an eraser to erase marks

Back

Engine parts wearing out

Front

How would the absence of friction affect a marble traveling on a long, straight path? Options: The marble’s speed would decrease., The marble’s speed would increase., The marble would stop immediately., The marble would remain at constant speed.

Back

The marble would remain at constant speed.

Front

When two surfaces rub, the irregularities of one surface get caught on those of the other surface?

Back

True

Front

What are 2 factors that determine the amount of friction between 2 objects?

Back

Normal force and roughness between surfaces

Front

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.
Options: Fg_x = 25N F_f = 15N μ = 0.35, Fg_x = 43N F_f = 33N μ = 0.35, Fg_x = 43N F_f = 33N μ = 0.77, Fg_x = 25N F_f = 15N μ = 0.77

Back

Fg_x = 25N F_f = 15N μ = 0.35

Front

Two blocks, weighing 250N and 350N, respectively, are connected by a string that passes over a massless pulley. What are the acceleration and tension in the string?

Back

a = 1.7 m/s², T = 290N

Front

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?

Back

75N

Front

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 = -F_f, T = WCosƟ + F_f, WSinƟ = T + F_f, T + F_f W

Back

WSinƟ = T + F_f