Unit 8 Science Test Flashcards
The force that keeps planets in orbit around the Sun is
Gravity
The force that works against both pushing and pulling forces is
Friction
_______ forces cause no motion or change of direction
Balanced
Using force to move or change the position or motion of an object
Work
Describes a machine with NO or FEW moving parts that make work easier
Simple
The force between one object moving or RUBBING against another object
Friction
The force between any two objects that have mass
Gravity
A push or a pull
Force
The amount of stuff inside an object
Mass
The time it takes for an object to go
a certain distance is
Speed
______ forces cause motion or change of direction
Unbalanced
A simple machine used to split things apart is a
Wedge
A simple machine often used to hold materials together is a
Screw
Repeating investigations helps scientists to see if there are any
Mistakes
Hattie travels to the planet Saturn. Saturn has a mass that is more than Earth’s. Will Hattie weigh more or less on Saturn than on Earth?
A. More
B. Less
A. More
Hi
B. More
What do the girl and the chair in this picture show?
the picture is of a girl leaning back in a chair and falling
A. Distance and speed
B. Muscular force
c. unbalanced forces
D. balanced forces
C. Unbalanced forces
What causes an object to change position?
A. It moves because of balanced forces
B. It moves because of unbalanced forces
C. It moves because of distance
D. It moves because of speed
B. It moves because of unbalanced forces
How did Isaac Newton make sure his ideas about gravity and forces were true and there were not any mistakes?
A. He did his experiments only one time
B. He did his experiments quickly
C. He repeated his experiments
D. He wrote down his results
C. He repeated his experiments
What would happen if there were no balanced forces?
A. We would not be able to measure speed.
B. Objects would always be moving.
c. Objects would never move
D. We would not be able to measure position
B. Objects would always be moving.
If Bob pushes the box with less force than Bill, what will happen to the box?
A. It will not move
B. It will break
C. It will move to the left (toward Bob)
D. It will move to the right (toward Bill)
C. It will move to the left (toward Bob)
John finishes a race after Ryan. which of these is true?
A. John had greater force than Ryan
B. John had greater speed than Ryan.
C. Ryan had greater speed than John
C. Ryan had greater speed than John
Which of these is an example of work being done?
A. A man hits a baseball with a bat and the direction of the baseball changes.
B. A girl pushes hard against a couch, but the door stays closed.
C. A cat leans against a door, but the door stays closed.
D. All of these
A. A man hits a baseball with a bat and the direction of the baseball changes.
How do simple machines make work easier?
A. They make it so less force is needed to move an object.
B. They do work without needing any force.
C. They change the direction of the force
D. both A and C
D. both A and C
How does an inclined plane make work easier?
A. It changes the direction of the force.
B. It increases the force in a rod.
C. It increases the distance an object moves
D. All of these
C. It increases the distance an object moves
Which of these is true of the apple on the head?
A. The forces are unbalanced
B. The forces are balanced
C. The apple will move to the right.
D. The apple will move to the left.
B. The forces are balanced
What would cause the apple to move toward the ground?
A. The forces would have to be unbalanced
B. The forces would have to remain balanced for a longer period of time.
C. Both of these
A. The forces would have to be unbalanced
An inclined plane wrapped around a post
screw
Two inclined planes placed back to back
wedge
looks like a ramp
inclined plane
a rope pulled around a wheel and axle
pulley
made of a bar that pivots at a fixed point
lever
made of a round shape that rolls and a rod that it turns around
wheel and axle
