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BMV - Quizlet Unit 7 Review (Forces and Motion) Florida Science Fusion 5th Grade

Terms in this set (47)

Changes in motion all have one thing in common. What is it?
They all require force.
What is a force?
A push or a pull.
Forces can cause an object at rest to do what?
Move
Forces can cause a moving object to do what four things?
1. Speed up
2. Slow down
3. Change direction
4. Stop
Can forces change an object's shape?
Yes
Forces are measured using what?
A spring scale
Forces are measure in units called what?
newtons (N)
The larger the force, the ____________ the change it can cause to the motion of an object.
greater
Smaller forces case ______________ changes.
smaller
Can more than one force act together in a way that does not cause a change in motion?
yes
What is the measure of the force that gravity exerts on a subject?
weight
The force of attraction between two objects is called what?
gravity
The size of gravity does what as the mass of the objects increase?
the gravity increases
What happens to gravity as the distance between two objects increases?
the gravity decreases
What is a force that opposes motion?
friction
Friction acts between two objects that are doing what?
touching
Friction can also exist between air and a moving object. What is this called?
air resistance
Friction changes the energy of motion into what?
thermal energy
When you sit on a chair, what pulls you down?
Gravity
What are forces on an object that are equal in size and opposite in direction?
balanced forces
What are forces that cause a change in motion?
unbalanced forces
An objects acceleration depends on what?
the object's mass and the force applied to it
The less an object's mass is, the ________ force is needed to change its motion.
less
If you wanted to slide a heavy box across the floor faster, you have two options. What are they?
1. You could take some of the items out of the box, which will decrease its mass.
2. You could have a friend help you slide the box, which will increase the force being applied to the box.
What is the force of attraction between a planet and another object?
gravity
An object moving through the air slows down because it is affected by what?
the force of gravity
What happens when balanced forces act on an object?
the object falls
In order for an object to change its speed or direction, what has to happen?
someone has to push the object
What are pushes and pulls that increase the speed of objects called?
Forces
Two forces that are equal in size but opposite in direction are called
balanced forces
Two forces that are not equal in size are called
unbalanced forces
The golfer applied force when he hit the ball. Describe at least two forces acting on the ball as it rolls.
1. Friction between the ball and the ground
2. Gravity
Explain why it is easier to slip on a floor that is wet.
because the water reduces friction between the floor and your feet.
Give an example of a force that is applied but nothing happens.
A person leans against a wall
When riding a bicycle, Taylor Swift has to pedal harder on a rough surface to overcome the force of _________?
friction
What forces act on a rocket while it's at rest on Earth's surface? Are they balanced or unbalanced?
Gravity pulls the rocket downward. Earth's surface pushes up on it. The forces must be balanced, because the rocket does not move.
Give an example of a force that causes an object to change shape?
An artist makes a clay sculpture
Give an example of a force that causes an object to change position?
a soccer player kicks a soccer ball
Give an example of a force that causes an object to stop moving?
a baseball player catches a ball
Who is someone who helps design and test devices that make them safer?
a safety engineer
To do their jobs, what do safety engineers need to study?
Physics, chemistry, math, and human behavior.
How do safety engineers help society?
They help prevent injuries and reduce illness. They make devices and workplaces safer
What safety features in cars have safety engineers helped to develop?
Seat belts and airbags
For which of these surfaces will friction be greatest when a block of wood slides across it? Wet ice, glass mirror, thick carpet, or waxed wood.
thick carpet
When you coast down a hill on a bicycle, you move faster and faster. Then when you keep coasting on a level surface, you eventually stop moving. What causes you to stop?
Friction between the tires and the ground is an unbalanced force that changes your motion.
A spring scale measures force. What is the force that causes the reading on the scale when Taylor Swift steps on it?
gravity
Which of these is an example of a force being applied?
A. Watching TV
B. Pulling a wagon
C. Reading a book
D. Standing at the top of a hill
B. Pulling a wagon
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