For every ______ force, there is an equal but opposite _______ force.
What are action and reaction.
100
This Italian scientist first used a telescope to observe planets and discovered that objects did not need a constant force to stay in motion.
Who was Galileo.
100
This is the measurement of total distance traveled divided by total time spent travelling.
What is average speed.
100
A surface's resistance to sliding forces is called ______.
What is friction.
100
A plane flies at a speed of 200 km/h when it encounters a wind blowing directly into its face at 80 km/h. What is the resultant velocity of the plane?
What is 120 km/h.
200
An object cannot accelerate without being acted on by an ________ force.
What is a external force.
200
This is the tendency of objects to resist acceleration or changes in their state of motion.
What is inertia.
200
This is the measurement of a change in velocity divided by the time interval required to do so.
What is acceleration.
200
Newton's second law states that if force is kept constant, these two quantities are inversely proportional.
What are mass and acceleration.
200
An object experiences the following forces.
a.) 27 N to the north.
b.) 36 N to the west.
c.) 9 N to the south.
d.) 12 N to the east.
What is the net resultant force on the object.
What is 30 N.
300
When net forces on an object are equal to zero, the object can be said to be in this state.
What is equilibrium.
300
This is the measurement of how much "stuff" an object is made of, and also functions as a measurement of its resistance to acceleration.
What is mass.
300
True or false: A car is moving on the road, the needle on its speedometer showing 30 km/h at all times. Because of this, we know that the car is not accelerating.
False. The car could be changing direction, even if its speed never changes.
300
When the air resistance on an object is equal to the force of gravity pulling down on it, the object is moving at ______ _________.
What is terminal velocity.
300
A box with mass 25 kg undergoes a force of 500 N and moves along the floor at a constant speed. What is the coefficient of friction of the floor?
What is 20.
400
Math Problem:
A 1000 kg cannon fires a 5 kg cannonball, causing it to accelerate to 200 m/s in half a second. What is the acceleration of the cannon?
What is 2 m/s^2.
400
This is the force of gravity pulling down on an object.
What is weight.
400
Math Problem: An object has a horizontal velocity of 80 m/s and a vertical velocity of 60 m/s. What is the magnitude of its velocity?
100 m/s
400
Math problem: A 10 kg object is pushed horizontally with a net force of 40 N. How far does the object travel after 5 seconds?
50 m.
400
An object is launched vertically and hits the ground after 10 seconds. How high did it reach? Ignore air resistance.
125 m.
500
Math question: A 50 kg person is skydiving, and experiences 100 N of air resistance. What is their net downward acceleration?
8 m/s^2
500
Math Problem:
Jupiter's surface gravity is 2.6 times the strength of Earth's. What is the mass of an object that weighs 520 N at Jupiter's surface?
What is 20 kg.
500
Math Problem:
An object on Earth falls from rest and hits the ground 3 seconds later. How high was the object when it started falling? Ignore air resistance.
45 m.
500
Math problem: An object resting Earth's surface is launched vertically at 30 m/s. How far away from its starting point is it after 6 seconds?
What is 0 m.
500
An object is fired from a cannon with a horizontal velocity of 30 m/s, and a vertical velocity of 40 m/s. How far does the object travel horizontally before hitting the ground?