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Science review sheet

QuestionAnswer
What does it mean to say that momentum is conserved It means that the momentum stays the same no matter what
Could an elephant have the same momentum as a golf ball? explain Yes because both are moving with the same velocity
What is the momentum of a 20 kg dog running at a speed of 8 m/s? 160 kg/s
Momentum The quanity of motion of a moving body, measured as a product of its mass and velocity
Explain the law of conservation of momentum The total momentum of objects that interact do not change
Newton's second law of motion described the relationship of force , mass, and acceleration. Write the equation A= Net force/ mass (net force divided by mass)
If you increase the force on an object its acceleration.... Also increases
If you increase the mass on an object, its acceleration.... Decreases
How much force is needed to accelerate a 3 kg skateboard at 5 m/s 15 N
Inertia A resistance to change in motion
The amount of inertia an object has depends on its ... Mass
What 2 factors affect the friction force between 2 surfaces? Types of surface and how hard the surfaces push together
What is one way to reduce friction between two surfaces? To make one or more surfaces smoother (with water or liquid etc)
The acceleration due to gravity of all objects in free fall is the same. Why then do all objects fall through the air with a different rate than others? Air resistance
How does mass differ from weight Mass never changes and weight changes depending on location
What two factors affect the gravitational force between two objects Mass and distance
Friction The general term for the force that one surface exerts on another when they rub against each other
Rolling friction The kind of friction the results when a wheel turns on a surface
Sliding friction The kind of friction that results when you rub sandpaper against wood
Fluid friction The kind of friction the exists between oil and a door hinge
Weight A measure of the force of gravity on an object
Free fall The state that exists when the only object acting an object is gravity
Gravity The force that accelerates objects towards earth
Terminal velocity A falling object reaches this when forces of gravity and air resistance are balanced
Air resistance The kind of friction that slows a falling object
Unbalanced forces vs. Balanced forces: Unbalanced Net force not = to 0 Changes an objects motion
Unbalanced forces vs. Balanced forces: Balanced Net force = 0 Does not change an objects motion
Unbalanced forces vs. Balanced forces: Both Push or pull Have direction
Describe how to combine unequal forces acting in opposite directions Add another small force going against a bigger force so that way it would make it balanced
Newton The SI unit for force
Force Push or pull
Unbalanced forces Can change an objects motion
Balanced forces Cant change an objects motion
Net force Sum of all forces acting on an object
Created by: Blasian123
 

 



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