Position and Motion
Motion can be described through a change in ________________.
Position
True or False: Forces that are equal in size but opposite in direction are called unbalanced forces.
Friction always acts in a direction _________________ to the direction of motion.
Mass and weight are different. Mass depends on ________________. Weight depends on _________________.
1. the amount of matter
2. gravitational force
What is kinetic energy?
The energy associated with the motion of an object.
Direction
True or False: If a net force acts on an object, the object may change speed, change direction or do neither.
False
If you push on a wall with a force of 30 N, the force acting on you from the wall is ____________?
30 N
What is most closely related to gravity?
Weight
What is potential energy?
The energy of an object associated to its position.
A train traveled 250 kilometers from its starting point in 5 hours. If the train continues at the same average speed for another 4 hours, how far will it have traveled from its starting point?
450 km
When two forces act in the same direction on an object, the net force is found by _________________ the forces.
Adding
The statement “for every action, there is an equal but opposite reaction” is a statement of Newton’s ______________ Law of Motion.
3rd Law of Motion
Gravity is an example of which kind of force?
Noncontact
The equation for kinetic energy is ________________
KE = 1/2 (M)(V^2)
True or False: To determine if an object has changed position, you need to know its position relative to another object.
True
According to Newton’s second law of motion, a large force acting on an object causes a greater ____________________ of the object.
Acceleration
Based on Newton’s 3rd law of motion, when a person on a skateboard throws a heavy concrete block to the north, the person will be pushed to the _______________.
South
If the mass of one of the two spheres increases, how does it affect the gravity between the two spheres?
the gravity increases
The equation for potential energy is ________________.
PE =(M)(G)(H)
What is the equation used to find speed?
Speed = Distance / Time
Alexis is pushing Bianka on a scooter. Alexis is pushing with 75 N of force to the left, and Bianka is helping with 20 N to the left. What is the net force on the scooter?
95 N to the left
Force pairs are always _______________ to the surface at which the force is being applied.
Gravitational force differs based on two things. It increases with increasing _______________. It decreases with increasing __________________.
1. mass
2. distance
The gravitational constant to is equal to _____________. Hint (G = what number when calculating gravity)
G = 9.8