Motion
What is Motion?
the movement of an object (up, down, left, right)
What is Force?
a push or a pull
can be contact or non-contact
A child is pulling a sled on a flat surface with a force of 50 Newtons to the right. Friction acts on the sled with a force of 10 Newtons from the left. What is the net force acting on the sled, which way is the sled moving?
40 N to the right
80 Newtons
A skateboarder pushes off the ground and rolls down a hill. What type of energy is the skateboarder using to start moving?
The skateboarder uses kinetic energy to start moving.
True or False: The greater the force applied to an object, the faster it will move.
True
When you place a book on a table, which force is responsible for keeping the book from falling through the table?
Normal Force
A sled is being pulled across the snow with a force of 30 N. If the friction between the sled and the snow is 10 N, what is the net force acting on the sled, and in which direction does it move?
30 N - 10 N = 20 N in the direction of the pull
A soccer ball is kicked with a force of 20 N (Newtons) to the right. If there is a frictional force of 5 N acting to the left, what is the net force acting on the soccer ball?
20 N - 5 N = 15 N to the right
A book is sitting on a table. Are there balanced or unbalanced forces?
balanced
What force is happening in this scenario?
A person riding a bicycle finds it harder to pedal when they go from the pavement to the grass.
Friction
A book is sitting on a table. Is the force acting on the book balanced or unbalanced? Explain your answer.
The forces acting on the book are balanced because the force of gravity pulling the book down is equal to the normal force of the table pushing up, resulting in no movement.
What force is happening in this scenario?
A paperclip is pulled across a desk without anyone touching it.
Magnetism
What force is happening in this scenario?
Earth stays in orbit as it travels around the Sun.
Gravity
Which of the following is the best description of an element?
A) A substance that cannot be broken down into simpler substances by a chemical or physical processes.
B) A naturally occurring mineral made of more than one substance.
C) A small particle made with a specific chemical composition composed of two or more atoms of different substances.
D) A collection of atoms that have different abilities when joined together.
A) A substance that cannot be broken down into simpler substances by a chemical or physical processes.
What is Newton's Third Law of Motion?
For every action there is an equal and opposite reaction.
A person pushes a box across the floor with a force of 40 Newtons. Which of the following best describes the type of force exerted by the person on the box?
- Gravitational force
- Frictional force
- Normal force
- Applied force
Applied force
A book rests on a table. The book exerts a downward force of 5 Newtons on the table due to gravity. According to Newton's Third Law of Motion, what is the reaction force?
The table exerts an upward force of 5 N on the book.
To calculate net forces with forces that are going in the same direction you have to...
add
What are the 5 ways to identify a chemical change?
1. Creation of Light
2. Creation of Precipitate
3. Creation of Gas
4. Change in Color
5. Change in Temperature
When launching a rocket, the action force is the exploding gases exiting the rocket. What is the reaction force?
The rocket pushes against the Earth
The rocket propels up
The rocket pushes against the air
Forces that are equal and in the opposite directions are....
balanced forces
Forces that are unequal and in opposite directions are...
Unbalanced forces
To calculate net forces with forces that are going in opposite directions you must...
subtract
A brand of salad dressing appears red when shaken. After it is left on the table for a minute, the red substance appears to settle to the bottom and a yellow substance appears to rise to the top. Based on this observation, the salad dressing appears to be a —
heterogeneous mixture