Explanation

• Gravity is the force that pulls objects towards the Earth.
• Keeping us and everything else on the ground.

Explanation

• Swimmers make their bodies streamlined to reduce friction underwater.
• It allowing them to move more efficiently and quickly through the water.

Explanation

• Friction forces between the air and a moving object cause resistance.
• Which slows down the object and converts some of its kinetic energy into heat.

Explanation

• Grease is a lubricant that can be used to reduce friction between moving parts of machines.
• It helps to reduce wear and tear, prevent overheating, and allow parts to move smoothly.

Explanation

• Increasing the weight is not a way to reduce friction.

Ways to reduce friction:

• Smoothing and polishing surfaces
• Reducing contact area
• Using oil and lubricants
• Using ball bearings and rollers

Explanation

• Fasteners (such as nuts and bolts) actually benefit from friction, as it helps keep them in place.

Disadvantages of friction:

• Energy loss: Friction converts useful energy into non-usable forms like heat.
• Wear and tear: Friction causes moving parts to wear out and deteriorate.
• Speed limit: Friction limits the maximum speed of automobiles.

Explanation

• Wear and Tear is not an advantage of friction.
• It's a disadvantage, as friction causes wear and tear on surfaces.

Advantages of Friction:

• Walking: Friction between the soles of our shoes and the ground allows us to walk without slipping.
• Braking: Friction between the brake pads and the wheels allows vehicles to slow down and stop.
• Securing knots: Friction between the fibers of a rope helps keep knots tight and secure.
• Fasteners: Friction between threads in screws and bolts helps keep them in place and secure

Explanation

Friction is the force that generates heat and warmth when surfaces rub against each other.

Explanation

• Motion is the change in position of an object over time.
• When an object moves from one place to another, it is in motion.

Explanation

• Friction is a force that opposes motion between two surfaces that are in contact.
• It acts in the opposite direction of motion, making it harder to move an object or keep it moving.