Position
& Motion
& Motion
Motion can be described through a change in _____.
What is position?
Balanced forces acting on an object cause the object to accelerate.
True or False?
False, the forces must be unbalanced in order for the object to move.
The statement "for every action, there is an equal but opposite reaction" is a statement of Newton's ____.
What is third law of motion?
Gravity is an example of which kind of force?
What is noncontact force?
How do you express Newton's 2nd law mathematically? (May the Force be with you)
Force = mass x acceleration
Distance, a reference point, and a reference _______ are all needed to determine the position of an object.
What is direction?
When two forces act in the same direction on an object, the net force is found by subtracting the forces.
TRUE or FALSE
What is false? The net force is found by adding the forces that are moving in the SAME direction.
When a bug hits a windshield of a car, the force of the car on the bug is greater than the force of the bug on the car.
TRUE or FALSE
False, they have an equal force according to Newton's 3rd law.
If the mass of one of two spheres increases, how does it affect the gravity between the two spheres?
What is the gravity increases?
What is the gravitational acceleration on Earth?
What is 9.8 m/s_squared?
You are in a car going 70 km/h and another car passes you going in the opposite direction at 70 km/h. Do both cars have the same velocity?
What is no, they do not have the same velocity. They must be going in the SAME direction to have the same velocity.
Friction always acts in a direction ___________to the direction of motion.
What is opposite?
Based on Newton's third law of motion, when a person on a skateboard throws a heavy concrete block to the north, the person will be pushed to the _______.
What is south?
An object’s weight is _____ its mass.
What is proportional to?
A planet is discovered that has four times the mass of Earth but the same gravitational acceleration. If you weigh 700 N on Earth, on the new planet you would weigh ____.
What is 700N? Weight depends on gravity.
When looking at a distance-time graph, what does the slope of the line tell you about the speed of the moving object?
The steeper the slope, the faster the speed.
Acceleration depends on which two factors?
What is net force and mass?
If you throw a ball into the air, Earth exerts a force on the ball. The ball in the air exerts no force on Earth.
True or False
False
Mass varies depending on where the object is located.
True or False
False. Mass stays the same because mass is the amount of matter that comprises the object.
A driver needs to make a delivery to an office that is 30 km away. The driver has traveled for 45 minutes west down a straight road at 50 km/h. Has the driver traveled far enough to reach the office?
Yes, because in 45 minutes he has traveled 37.5 km. He's gone too far.
The driver has traveled for 0.75 h and has traveled (50 km/h)(0.75 h) = 37.5 km.
_____________ can be calculated if you know the distance an object travels in one unit of time .
What is speed?
According to Newton's second law of motion, a larger force acting on an object causes a greater _________ of that object.
What is acceleration?
Roger sits on a bench at a park. What are the 2 force pairs involved in this situation?
The earth pulls on Roger, Roger pulls on the Earth.
Roger pushes on the bench, bench pulls on Roger.
Mass and weight are different. Mass depends on _____. Weight depends on _____.
What is the amount of matter, gravity?
What factors influence how fast an object falls to the ground? List at least three.
Mass, distance, air resistance, strength of gravitational field