To arrange three magnets in a triangle so that they all attract, you can place two magnets with opposite poles facing each other at the base of the triangle, and then place the third magnet with the opposite pole facing towards the two magnets at the top of the triangle.
As for the needles hanging from the ends of a bar magnet, they lean towards each other due to the phenomenon of magnetic attraction. The bar magnet creates a magnetic field around it, and since the two needles are made of materials that can be magnetized (such as iron or steel), they become temporary magnets when in the presence of the bar magnet's magnetic field. According to the laws of magnetism, opposite poles attract each other, so the needles, acting as temporary magnets, are attracted towards the opposite poles of the bar magnet, causing them to lean towards each other.
How could you arrange three magnets in a triange so that they all attract?
Explain why two needles, hung from the ends of a bar magnet as shown lean towards each other.
5 answers
Can you think of examples of friction in your everyday life?
Certainly! Here are some examples of friction in everyday life:
1. Walking: When we walk, friction between the soles of our shoes and the ground helps us grip and push off with each step.
2. Driving: Friction between the tires of a car and the road provides the necessary traction for the wheels to move and stop the vehicle.
3. Writing: Friction between the pen or pencil and the paper allows us to create legible marks on the surface.
4. Opening a Jar: When we try to open a tightly sealed jar, we apply force to overcome the friction between the lid and the jar to twist it open.
5. Braking on a Bicycle: Friction between the brake pads and the wheel rims helps slow down and stop the bicycle.
6. Rubbing Hands Together: When we rub our hands together, friction generates heat due to the resistance between the surfaces of our hands.
7. Sliding Down a Slide: The friction between our body and the slide allows us to control our descent, regulating our speed as we slide down.
8. Playing Sports: In activities like basketball, soccer, or tennis, friction between the ball and the playing surface affects the ball's movement and player's control.
These are just a few examples, but friction is present in many other everyday activities as well.
1. Walking: When we walk, friction between the soles of our shoes and the ground helps us grip and push off with each step.
2. Driving: Friction between the tires of a car and the road provides the necessary traction for the wheels to move and stop the vehicle.
3. Writing: Friction between the pen or pencil and the paper allows us to create legible marks on the surface.
4. Opening a Jar: When we try to open a tightly sealed jar, we apply force to overcome the friction between the lid and the jar to twist it open.
5. Braking on a Bicycle: Friction between the brake pads and the wheel rims helps slow down and stop the bicycle.
6. Rubbing Hands Together: When we rub our hands together, friction generates heat due to the resistance between the surfaces of our hands.
7. Sliding Down a Slide: The friction between our body and the slide allows us to control our descent, regulating our speed as we slide down.
8. Playing Sports: In activities like basketball, soccer, or tennis, friction between the ball and the playing surface affects the ball's movement and player's control.
These are just a few examples, but friction is present in many other everyday activities as well.
a. Which of the four forces represented is a non-contact force?
b. If force D was bigger than B, the rider would move ______.
c. The cyclist’s speed is ____________.
d. Describe what would happen to the cyclist’s motion if the size of force C increased to become equal in size to force A.
b. If force D was bigger than B, the rider would move ______.
c. The cyclist’s speed is ____________.
d. Describe what would happen to the cyclist’s motion if the size of force C increased to become equal in size to force A.
a. The non-contact force represented is force D, the magnetic force between the magnet and the metal ball.
b. If force D was bigger than B, the rider would move towards the right.
c. The cyclist's speed is constant (inertia) since there is no net force acting on the cyclist. The forces A and C cancel each other out.
d. If the size of force C increased to become equal in size to force A, the cyclist's motion would be affected. Since force C is acting in the opposite direction to force A, the net force acting on the cyclist would become zero. As a result, the cyclist would experience balanced forces and come to a stop or maintain a constant speed, depending on the other external forces present.
b. If force D was bigger than B, the rider would move towards the right.
c. The cyclist's speed is constant (inertia) since there is no net force acting on the cyclist. The forces A and C cancel each other out.
d. If the size of force C increased to become equal in size to force A, the cyclist's motion would be affected. Since force C is acting in the opposite direction to force A, the net force acting on the cyclist would become zero. As a result, the cyclist would experience balanced forces and come to a stop or maintain a constant speed, depending on the other external forces present.