Vocabulary
Forces that can cause a change in motion are?
Unbalanced Forces
What two factors affect the gravitational force between gravity and two objects?
A. Force and size
B. Size and distance
C. Mass and distance
D. Mass and force.
C. Mass and distance
Push and pull are examples of force.
True
Which of the following is the best way of stating Newton's 1st law?
A. Objects in space move randomly and unpredictably because no forces act on them.
B. Once an object at rest begins to move it will soon begin to slow down, turn, or stop.
C. Balanced forces cause an object to move, and unbalanced forces cause it to stop moving.
D. Objects at rest don't move unless an unbalanced force acts on them, and object in motion don't slow down, speed up, or turn unless a force makes them do so.
D. Objects at rest don't move unless an unbalanced force acts on them, and object in motion don't slow down, speed up, or turn unless a force makes them do so.
A force of attraction between two objects, even if they are not touching, is?
Gravity
Which of these is an example of a force being applied?
A. watching tv
B. reading a book
C. Pulling a wagon
D. Standing at the top of a hill
Friction is a force of attraction between two objects, even if they are not touching.
False--Gravity
According to Newton's 2nd law of motion, what two factors determine an object's acceleration?
A. The speed of the object and the power of inertia on the object.
B. The mass of the object and the amount of force applied to the object.
C. The shape of the object and the material from which the object is made.
D. The strength of gravity as it is applied to the object and the weight of the object.
B. The mass of the object and the amount of force applied to the object.
A push or pull, which causes movement or change in object's movement or shape is a(n)?
Force
Two boys are about to use the same force to push a parent and a child on the swings. Which describes what will happen.
A. The parent will swing higher
B. The parent will accelerate faster
C. The child will accelerate faster
D. The parent and the child will accelerate as the same rate.
C. The child will accelerate faster
A sudden shift in acceleration is inertia.
False--The tendency of objects to resist a change in motion.
According to Newton's 3rd law of motion, what happens whenever on object applies a force to a second object?
A. The 2nd object accelerates
B. The 1st object changes the mass of the 2nd object.
C. The 2nd object applies an equal, opposite force to the first object.
D. The 1st object and 2nd object begin to move, or they change the way they are moving.
A. The 2nd object accelerates
Forces on an object that are equal in size and opposite in direction are?
Balanced Forces
Why would an object in a spacecraft float in the air rather than falling to the floor?
A. There is no gravity in space
B. None of Newton's laws of motion applies in space
C. The force of gravity in space is less than it is on Earth
D. Inertia allows the object to overcome the force of gravity
C. The force of gravity in space is less than it is on Earth
An unbalanced force causes a change in motion.
True
When you coast down a hill on a bicycle, you move faster and faster. When you coast on a leveled surface, you eventually stop moving. How do Newton's laws of motion explain what causes you to stop?
A. Newton's 2nd law explains that no force is acting on your bike on the level surface, so it stops moving.
B. Newton's 1st law explains that after you reach the bottom of the hill, you run out of energy, so you stop moving.
C. Newton's 3rd law explains that friction between the tires and the ground is an unbalanced force that changes your motion.
D. Newton's 1st law explains that gravity affects you when you move downhill but does not affect you when you move on a level surface.
C. Newton's 3rd law explains that friction between the tires and the ground is an unbalanced force that changes your motion.
A force that opposes motion and acts between two objects that are touching is?
Friction
An object is traveling in a straight line in space. No forces are affecting it. Because of inertia, what will happen to the object's motions?
A. It will move faster and faster because there is no force to stop it.
B. It will stop gradually because there is no force to keep it moving.
C. It will stop immediately when the force that started its motion goes away.
D. Its motion will not change, and it will continue the pattern of moving in the same direction at the same speed.
D. Its motion will not change, and it will continue the pattern of moving in the same direction at the same speed.
A balanced force opposes motion and acts between two objects that are touching.
False--Friction
Katja pushes a bowling ball away from her with a lot of force. Then she repeats the same procedure with a soccer ball. How do Newton's laws explain the difference between the movement of the two balls?
A. Newton's 2nd law of motion explains that the soccer ball moves a greater distance because it has less mass.
B. Newton's 3rd law of motion explains that the soccer ball moves a greater distance because more force is acting on it.
C. Newton's 2nd law of motion explains that the bowling ball moves a greater distance because it has more mass.
D. Newton's 1st law of motion explains that the bowling ball moves a shorter distance because less force is acting on it.
A. Newton's 2nd law of motion explains that the soccer ball moves a greater distance because it has less mass.