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Force test

QuestionAnswer
Describe how you can tell if something is in motion. Compare the position of the object to a reference point that’s not moving (trees, stop sign, etc.)
What is the difference between speed and velocity? Speed is how fast something is moving. Velocity is how fast something is moving in a certain direction. The direction can be north, east, south, west, or something like ‘towards California.’
What are the units for speed? What are the units for velocity? Speed - m/s Velocity- m/s with a direction
By looking at the calculation of acceleration of an object, how would you know if it is speeding up or slowing down? If it is speeding up, the answer will be a positive number. If it is slowing down, the answer will be a negative number.
What 3 factors can cause a change in acceleration? Speeding up, slowing down, a change in direction.
Describe force (two things)? A push or a pull.
If an object is subjected to balanced forces, will the object change its motion? No
What is the net force on a piano if I pushed on the piano with a force of 20 Newton’s and you pulled on the piano with a force of 20 Newton’s? 40 N
Two teams are playing tug of war. The first team is pulling with a force of 200 Newton’s. The second team is pulling with a force of 188 Newton’s. What is the net force? Who will win? 12 N, the first team will win because they are pulling with more force.
What is friction? The force that two surfaces exert on each other when they rub against each other
How can you reduce friction of a box you are trying to move across the floor? Decrease the weight, make the surface smoother.
How can you increase friction? Make an object heavier or increase the roughness of the surface.
ROLLING ...
What is it? Rolling objects
Ex ball rolling on the ground
Rank in order of decreasing amount of friction (1,2,3,4) 3
STATIC ...
What is it? Non-moving
Ex trying to push a heavy couch across the floor
Rank in order of decreasing amount of friction (1,2,3,4) 1
FLUID ...
What is it? Liquids (water) or gasses (air resistance)
Ex Swimming
Rank in order of decreasing amount of friction (1,2,3,4) 4
SLIDING ...
What is it? Sliding objects
Ex sliding a box across the floor
Rank in order of decreasing amount of friction (1,2,3,4) 2
In your own words, describe Newton’s 1st Law of Motion. Give an example. An object in motion stays in motion at a constant velocity and an object at rest stays at rest unless an unbalanced force acts on it. Jolting forward in a car when it stops short.
In your own words, describe Newton’s 2nd Law of Motion.. The acceleration of an object depends on its mass and the force used to move it.
What happens to acceleration if force is increased? Acceleration increases.
What happens to acceleration if mass is increased? Acceleration decreases.
In your own words, describe Newton’s 3rd Law of Motion. Give an example. Every action has an equal and opposite reaction. Push on the ground, the ground pushes back.
On Earth, a feather and a hammer dropped from the same height will fall at different accelerations. In space, a feather and a hammer dropped from the same height will fall at the exact same acceleration. Explain why this is. On Earth, there is air resistance, in space, there is no air resistance. Gravity!
Do gravitational forces cause objects to be attracted to each other or move away from each other? Attracted to each other.
What happens to the gravitational force between two objects if their masses increase? The gravitational force increases.
What happens to the gravitational force between two objects if the distance between them increases? The gravitational force decreases.
Created by: 30patels
 

 



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