Forces
The unit used to measure net force.
Newtons
A change in position over time is called ?
Motion
What is the average speed formula?
Average Speed = Distance / Time
Gravity is a force of attraction between two objects due to their __________________?
Mass
A runner completed a 100-meter race with a time of 25 seconds. What was her average speed?
Average speed = 4 seconds per meter
Define force
A push or pull
Which law of motion is represented by this situation. A piece of paper lying on a desk will not move unless someone or something moves it.
Newton's 1st law of motion
A plane flying from Los Angeles to New York has a speed of 489 miles per hour. The distance from Los Angeles to New York is about 2445 miles. Solve for the time it takes for the flight.
5 hours
True or False?
As the distance between two objects decreases its gravitational force also decreases.
False
What does no motion on a distance-time graph look like?
A horizontal line parallel to the x-axis
Calculate the total net force if someone is pushing on one side of a box applying 60 newtons of force and someone else is on the other side pushing with 38 newtons force.
22 newtons
Explain Newton's 2nd Law of Motion
The acceleration of an object depends on the mass of the object and the amount of force applied.
F = ma
A person drove a car 336 miles west for 7 hours. Calculate his velocity.
48 miles per hour west
Why can an astronaut with the same mass weigh less on the moon than on Earth?
Because the gravity of the moon is less due to the moon having less mass than the Earth.
There is less gravitational pull on the moon so the force of their weight on the scale is less.
What is the formula for finding acceleration?
Final velocity - initial velocity divided by time squared
Force > 490
Newton's 1st Law is also known as what?
The law of inertia
How does velocity differ from speed?
Velocity includes direction.
What must two objects have for gravity to exist between them?
A. Mass
B. Volume
C. Solidness
D. Roundness
A. Mass
A horse is galloping at 13 m/s. Five seconds later, the horse is moving at 5.5 m/s. Find the acceleration that describes this change in velocity.
-1.5 meters per second squared
If a football player pushes a blocking bag (also known as a blocking dummy) with a force of 300 N, and the object has a mass of 75 kg, what is the object's acceleration in m/s. squared?
F = ma
300 = 75a
acceleration = 4 meters per second squared
Which law of motion is represented by this situation. When rowing a boat, we paddle our boat, which pushes water backward, moving the boat forward.
Newton's 3rd law of motion
What does a truck slowing down to stop at a red light represent?
Negative acceleration
True or False?
The gravitational force between two objects increases with the mass of each object?
True
What force is necessary to accelerate a 70 kg object at a rate of 4.2 meters per second squared?
F= ma
F= 70(4.2)
294 N