Forces and FBD's
This force is applied to an object by the surface it is on.
What is Newton's first law of motion/ What else is it called? (In your own words)
Along the lines of: An object at rest remains at rest, or if in motion remains in motion at a constant velocity unless acted on by a net external force.
OR
Law of Inertia
What are the two types of friction?
Static and Kinetic
Everything in the universe with mass or energy has gravity. TRUE OR FALSE
True
Who is the President of Russia?
Vladimir Putin
I pushed the door open to get into the classroom. What force was put on the door by me?
Applied Force
A book is resting on a table. Identify all the forces acting on the book and which of Newton's laws explain why the book remains at rest.
Gravitational Force and Normal Force; Newton's First Law
A box is resting on a horizontal surface. You start to push it gently to the right. Explain why the box doesn't immediately start moving, even though you are applying a horizontal force. Which type of friction is acting in this situation?
The box doesn't immediately start moving because of static friction.
A spring is compressed by a certain distance from its equilibrium position. Explain why the spring exerts an outward force and how the magnitude of this force changes if the compression distance is doubled.
It resists this compression and exerts a restoring force that tries to push it back to its equilibrium position.
How many Senators are in the US Senate?
100
Which of the following allow you to determine the magnitude of the forces applied on the object relative to other magnitudes in a FBD? (Ex. the Fn is 2x the magnitude of Ff)
- The color of the block
- The length of the lines
- The weight of the block
- The direction that the lines are going.
The length of the lines.
I pushed a shopping cart weighing 20 kg with 400 N of force. What is the acceleration of the cart?
20 m/s^2
You are trying to slide a heavy piece of furniture across a carpeted floor. You find that it takes more force to get it moving than to keep it moving at a constant velocity. What type of friction is involved?
Static Friction
A car is moving around a flat, circular track at a constant speed. What is the direction of the net force acting on the car?
The net force acting on the car moving in a circle at a constant speed is directed towards the center of the circle.
What is the most spoken language in Switzerland?
German
I need to draw a free body diagram of my cat, this is its situation:
- It is sitting on the top of a tree.
- Its tail got stuck in a coiled branch to its left.
- Normal Force Upward: The top of the tree
- Gravitational Force Downward: Gravity
- Spring Force Leftward: COILED Branch
You are trying to pull a stubborn donkey forward with a rope. The donkey pulls back with an equal and opposite force, according to Newton's Third Law. If this is the case, how can you ever get the donkey to move forward?
The donkey will move forward if the net external force acting on the donkey in the horizontal direction is in the forward direction.
Imagine a car driving up a steep, icy hill at a constant velocity. The tires are spinning slightly but not slipping completely. In what direction is the net force of friction exerted by the road on the tires?
The net force of friction exerted by the road on the tires is up the incline.
A spring with a spring constant of 200 N/m is stretched by 0.15 m from its equilibrium position. What is the magnitude of the restoring force exerted by the spring?
30 N
Which TWO US States have most of their people living on islands?
New York and Hawaii
Two people are pulling on the ends of a rope. Each person pulls with a force of 50 N. The tension in the rope is:
(A) 0 N (B) 50 N (C) 100 N (D) 200 N
B.) 50 N
A person with a mass of 100 kg is standing on a hockey rink with very little friction. They exert an average horizontal force of 200 N on a 10 kg dumbbell for a duration of 4 seconds to throw it. What is the magnitude of the initial recoil velocity of the person immediately after releasing the dumbbell?
8 m/s
A 5.0 kg block is pulled horizontally across a rough surface by a force of 20.0 N. If the coefficient of kinetic friction between the block and the surface is 0.30, what is the magnitude of the acceleration of the block?
1.06 m/s²
A 2.0 kg mass is attached to the end of a string and swung in a horizontal circle with a radius of 0.8 m at a constant speed of 3.0 m/s. What is the magnitude of the tension in the string providing the centripetal force?
22.5 N
What is the second largest city in France?
Marseille