18 Questions
What type of force helps a moving object to stop?
Friction
Which force helps a stationary object to move?
Applied force
What type of force is demonstrated when rubbing hands together?
Friction
Which force helps change the shape of an object?
Friction
Which simple machine involves a bar turning around a point called the fulcrum?
Lever
When is work considered done on an object?
When an object moves due to applied force
What is force according to the text?
A push or pull on an object
How is force useful to us based on the text?
Force changes the direction of objects
What causes a moving object to stop or change direction according to the text?
Friction
What type of force helps make things go faster or slower?
Applied force
Which action requires force according to the text?
Pushing a shopping cart
Which scenario illustrates the use of force changing the shape of an object?
Kneading dough
What is the force that pulls everything towards the center of the Earth?
Gravitational force
Why does a ball fall to the ground when thrown up in the air?
Due to gravitational force
What is the force that acts between two objects to slow down or stop one of them?
Frictional force
What is the role of friction in helping you hold a pencil?
To enhance grip
Why does a ball rolling on the ground eventually slow down and stop?
Due to frictional force
Why does the force of gravity become weaker as something moves farther away from the Earth?
Due to reduced gravitational pull
Study Notes
Types of Forces
- There are two main types of forces: Gravitational force (Gravity) and Frictional force (Friction)
Gravitational Force (Gravity)
- Gravity is the force that pulls everything towards the center of the Earth
- It is what keeps us on the ground and prevents us from floating away
- Gravity gets weaker as the distance from the Earth increases
- Astronauts float in space because of the weaker gravity
- Gravity is a pulling force
Frictional Force (Friction)
- Friction is the force that acts between two objects to slow down or stop one of them
- Friction occurs when two surfaces are in contact with each other
- Friction helps us hold objects, like a pencil, without them slipping away
- Friction is necessary, but too much friction can be bad
Work
- Work is done when a force is applied to an object and the object moves
- If the force is applied but the object does not move, work is not done
- Work is done when the force is applied in the direction of the object's movement
Simple Machines
- Simple machines are tools that help us do work easier and faster
- Examples of simple machines include: lever, inclined plane, pulley, wheel-and-axle, screw, and wedge
- A lever is a simple machine that helps us lift, pull, or push things
Learn about the different types of forces, such as gravitational force or gravity and frictional force or friction. Understand how these forces impact objects in our daily lives.
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