Download Forces Begin worksheet

Name ___________________________
This worksheet introduces your basic types of forces and Newton’s laws of motion.
1) What is Newton’s First Law of Motion?
2) What is Newton’s Second Law of Motion (look familiar)?
3) What is Newton’s Third Law of Motion?
4) How does weight differ from mass?
5) What is the normal force, tension, the force of friction?
Period _____
6) What is a general rule of thumb for kinetic friction vs. static friction?
7) Air resistance (or air drag) is similar to what force and is roughly dependent on what factors?
8) A car that weighs about 2000 kg (m) is dropped from rest atop of a building. Ignoring air
resistance and assuming gravity to be constant, find the force of gravity (𝑭𝒈) on this falling
car.
9) Now if you take in the account of air drag, this car experiences 10000 N of force from air drag
as it falls. What is the total (resultant) force accounting both gravity and air resistance?
10) A person sitting at rest on a rock experiences two forces. What are these two forces?
11) Given that these forces counter act each other, which of Newton’s laws best accounts for this
fact?
12) Another famous type of force (especially for Physics and Mechanical Engineering) is the force
from a harmonic oscillator (aka the humble spring). What is this force and what is the law it
goes under?
13) A bullet in a gun accelerates from rest. It reaches a final velocity of 320 m/s when leaving the
barrel of the gun in about 0.01 s. What is the acceleration of this bullet at the end of the
barrel?
14) Given that this bullet weights about 0.1 kg what is the force that this bullet will have on
impact?
15) Bonus: In an inductor (an electrical component) a time varying magnetic field (B) is created as
⃗⃗⃗⃗⃗𝑩 ). This force varies with both
current is ran through the wire. This creates a magnetic force (𝑭
time and space and is a way of storing electrical energy. Given the equation below at the
given point; sketch two graphs at time 0 (t=0) and 2 seconds later (t= 2 s) at the position (2,1).
̂ just means in the x direction, while 𝒚
̂ means in the y
[Hint, (2,1) means x = 2 and y = 1; also 𝒙
direction]
⃗⃗⃗⃗⃗
𝑭𝑩 =
𝒕
(𝒙 𝒙
̂ + 𝟐𝒚 𝒚
̂)
𝟐