Graded Group Friction

A box with mass 20kg is on a cement floor. The coefficient of static friction between the box and floor is 0.25. A man is pushing the box with a horizontal force of 35N to the left. What is the magnitude of the force of static friction between the box and floor?

A 40kg

box is initially sitting at rest on a horizontal floor with a coefficient of static friction μ=0.4

. A horizontal pushing force is applied to the box. What is the maximum pushing force that can be applied without moving the box? (round to the whole number)

What are the units of the friction coefficient μ

in the formula:

F friction =μ⋅F normal

• N

• m/s²

• kg

• none

A magician pulls a tablecloth out from under dishes and glasses on a table without disturbing them.

• Newton's 1st Law
• Newton's 2nd Law
• Newton's 3rd Law
• None of them

Tags

NGSS.MS-PS2-5

Rockets are launched into space using jet propulsion where exhaust accelerates out from the rocket and the rocket accelerates in an opposite direction.

• Newton's 1st Law
• Newton's 2nd Law
• Newton's 3rd Law
• None of them

Tags

NGSS.MS-PS2-1

Pushing a child on a swing is easier than pushing an adult on the same swing, because the adult has more mass.

• Newton's 1st Law

• Newton's 2nd Law

• Newton's 3rd Law

• None of them

Tags

NGSS.HS-PS2-1