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Gravity
Terms in this set (48)
an object must have a net force on it to move in a circle: true or false?
true
the earth is accelerating as it orbits the sun: true or false?
true
Is weight positive or negative when a car travels over a circular hill?
positive
centripetal force for object moving in a horizontal circle must be horizontal: true or false?
true
weight & tension are both part of the cetripetal force for a yo-yo in a horizontal circle: true or false?
false - only x component of tension
you can calculate how fast a car is moving along a circular track if you know radius and time for one lap: true or false?
true
forces which are radially outward are positive: true or false?
false
torques are always measured from one end of a board: true or false?
false (pivot or anywhere)
Is torque a turning force?
yes
Objects tied together with a rope have the same acceleration: true or false?
true
normal force always equals mg: true or false?
false
must be a net force for an object to move at constant velocity: true or false?
false
human cannonball fired off a cliff, energy after being launched is:
PE + KE
Pulled sled across flat ground at horizontal force of 100N, what is x-equation for F=MA
P-f=ma
projectile shot at 20 m/s at 38 degrees shot level ground and what is true at peak?
Vfy = 0
Double your speed, what happens to KE
quadruples
What is true about a projectile?
acceleration of g is always -9.8 m/s2
leftover force on an object will make it _______
accelerate
On a v-t graph, slope represents
acceleration
how many forces are on an object sliding downhill on a rocky surface?
three
What has no effect on an object's projectile hang time?
Vix
What are the units of momentum?
kg m/s
velocity-time graph, area under curve means....
displacement
force of friction depends upon?
normal force, mass, roughness between surfaces
When an object is skidding on _______ friction is the greatest.
a flat floor
arrow fired horizontally 12 m/s & 30 degrees. How do you find the vertical velocity just before it hits the ground?
(-12sin30) m/s
What does acceleration equal for average velocity problems?
0
In an x-t graph how do you get displacement, velocity, and acceleration?
Displacement: read
Velocity: slope
Acceleration: -
In an v-t graph how do you get displacement, velocity, and acceleration?
Displacement: area
Velocity: read
Acceleration: slope
In an a-t graph how do you get displacement, velocity, and acceleration?
Displacement: -
Velocity: area
Acceleration: read
What is Newton's law of inertia?
Object @ rest stays @ rest, object in motion will stay in motion
To maximize an object's inertia, what must be done?
increase it's mass
Does an object have mass in deep space?
Yes, an object always has mass.
What determines how big the coefficient of friction is?
surface
What determines how big the force of friction is?
acceleration & mass
What happens to the normal force as the hill increases in angle?
decrease
What happens to the friction force as the hill increases in angle?
increase
What happens to the weight as the hill increases in angle?
same
What is true about air resistance and weight when an object reaches terminal velocity?
the object's weight is balanced up by the air resistance
Does an object stop falling at terminal velocity? If not, what is true about its speed?
Not always, the speed depends on the weight of the object.
If an object doubles its speed, what happens to the momentum?
it also doubles
If a child sits on the end of a teeter totter, where must her brother-who weighs twice as much-sit so they balance?
1/2 way
How can its weight cause a board to have a torque?
by pushing near the pivot or pushing less force further away
If an object has torque, how would it's motion change?
If the torque is positive it turns counterclockwise, if it's negative it turns clockwise
How does friction act as a centripetal force?
tires on pavement?
How does gravity act as a centripetal force?
a force ever mass exerts on every other mass in the universe
How does normal act as a centripetal force?
carnival rides?
How does tension act as a centripetal force?
tension is always toward the center of the circle
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