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Force and Motion

Force and Motion Test Review

What is velocity? Speed + Direction
How do unbalanced forces affect the motion of an object? Objects will speed up, slow down, or change direction if unbalanced forces are acting on them.
There are 4 wagons. Each one has a different mass. If students pull the wagons with the same amount of force, which wagon will move the fastest? The one with the least amount of mass
Which of the following is an example of velocity? A. 100 m/s B. 100 m/s2 C. !00 m/s east D 100 m C
Think back to the video of the skydiver that we watched in class. During which parts of the fall were the forces balanced on the skydiver? When the forces of gravity and air resistance were equal and opposite (Balanced)
What is the net force on an object that has balanced forces acting on it? 0 Newtons
What unit is used to measure force? Newtons (N)
A car travels 40 miles in 30 minutes. What is the speed of the car in miles per hour? 80 mph
What is the difference between speed and velocity? Speed only tells you how fast something is moving. Velocity tells you speed and also gives you the direction of travel.
On a speed - time graph, what does a flat line represent? Constant Speed
On a speed - time graph what does a upwards slanted line represent? Acceleration - speeding up
On a speed - time graph, what does a line slanted down towards the x axis represent? Acceleration - slowing down
On a distance (position) - time graph what does a flat line represent? An object that is not moving
On a distance - time graph, what does a straight slanted line represent? Constant speed
On a distance - time graph, what does a line slanted down towards the x axis represent? Return to starting point
On a distance - time graph, what does the y-intercept represent? Where the object starts moving
What is acceleration? A change in velocity
How can you tell if an object is accelerating? If it is speeding up, slowing down, or changing direction it is accelerating
How is acceleration represented on a distance-time graph? A curved line (upwards for speeding up, downwards for slowing down)
What is a force? A push or a pull
What is the relationship between slope and speed? A steeper slope represents a faster speed
How do you calculate net force? If the forces are going in the same direction you add them, if they are going in opposite directions you subtract
What subatomic particle identifies an atom? proton
When looking at a bohr model of an atom, how do you determine the number of valence electrons? You count the electrons in the outer most shell
If 2 atoms are in the same period, what do they have in common? They have the same number of energy levels (shells) for their electrons
What determines the reactivity of an atom? The number of valence electrons
According to the law of conservation of mass, how does the mass of the reactants compare to the mass of the products? They are the same
Atoms in the same _______________ have similar properties. group/family
Created by: hgorman
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