Answered step by step
Verified Expert Solution
Question
00
1 Approved Answer
Dynamics Intro Dynamics: The branch of Physics which deals with the causes of motion Force: A force is a push or pull Forces are measured
Dynamics Intro
Dynamics: The branch of Physics which deals with the causes of motion
Force: A force is a push or pull
Forces are measured in Newtons
Force is a vector quantity.
FBD: An FBD is a simple diagram of an object showing all the forces acting on the object.
e.g.Free fall Book on a desk
Pushing a lawn mower:
Reviewing Newton's 3 Laws
- State each of Newton's 3 Laws and give 2 good examples of each
- What is inertia?
- Add these definitions to your notes::
- A State of equilibrium - a state in which all forces are balanced ( Newton's first law applies)
- Static equilibrium - same as part "a" but the object is at rest
- Dynamic equilibrium -same as part "a" but the object is moving
Dynamics Intro Problems
- Assume an 8-passenger Learjet has a force of gravity of 6.6 x104N [down] acting on it as it travels at a constant velocity of 6.4 x102km/h [W]. If the forward thrust provided by the engines is 1.3 x104N [W], determine:
- the upward lift force on the plane
- the force due to air resistance on the plane
- Which of the following italicised objects are not examples of Newtons First Law; explain your choice:
- A cat-food can moves at a constant velocity on a conveyor belt in a factory.
- A skydiver falls vertically at terminal velocity
- A rubber stopper is tied to the end of a string and swings back and forth as a pendulum.
- A shopper stands on an escalator, halfway between floors in a department store and rises at a constant velocity.
- A ball travels with projectile motion after leaving a pitchers hand.
- A child is trying to push a large desk across a wooden floor. The chile is exerting a horizontal force of magnitude 3.8 N, but the desk is not moving. What is the magnitude of the force of friction acting on the desk?
- A snowboarder is travelling at a high speed down a smooth, snow covered hill. The board suddenly reaches a rough patch, encountering significant friction. Use Newtons first law to describe what is likely to happen to the snowboarder
- You are sitting on a bus that is travelling at a constant velocity of 55 km/h [N]. You toss a tennis ball straight up and it reaches a height that is level with your eyes. Does the ball hit you in the face? Explain your answer
- The following sets of forces are acting on a common point. Determine the additional force needed to maintain static equilibrium:
- 265 N [E], 122 N [W]
- 32 N [N], 44 N [E]
- Explain the danger of storing heavy objects in the rear window space of a car.
- A horizontal force is applied to a hockey puck of mass 0.16 kg initially at rest on the ice. The resulting acceleration of the puck has a magnitude of 32 m/s2 . What is the magnitude of the force? Ignore friction.
- A fire truck with a mass of 2.95 x104 kg experiences a net force of 2.42 x104 N [fwd]. Determine the acceleration of the truck.
- A 7.27 kg bowling ball travels at 5.78 m/s [W] strikes a lone pin straight on. The collision lasts for 1.2 ms and causes the balls velocity to become 4.61 m/s [W]. Determine the net force acting on the ball during the collision.
Step by Step Solution
There are 3 Steps involved in it
Step: 1
![blur-text-image](https://dsd5zvtm8ll6.cloudfront.net/includes/images/document_product_info/blur-text-image.webp)
Get Instant Access with AI-Powered Solutions
See step-by-step solutions with expert insights and AI powered tools for academic success
Step: 2
![blur-text-image](https://dsd5zvtm8ll6.cloudfront.net/includes/images/document_product_info/blur-subtext-image.webp)
Step: 3
![blur-text-image](https://dsd5zvtm8ll6.cloudfront.net/includes/images/document_product_info/blur-subtext-image.webp)
Ace Your Homework with AI
Get the answers you need in no time with our AI-driven, step-by-step assistance
Get Started