Words to use:

Accelerate - Sliding - Brake - Friction - Slipping - Inertia Velocity - Wheel - Strength - Static - Terminal velocity

Questions

1. An object will ____?____ when the net force is not zero.

2. ____?____ will never speed up an object.

3. The friction that prevents an object from moving when a force is applied is ____?____ friction.

4. The friction that slows down an object that slides is ____?____ friction.

5.A(n) ____?____ helps reduce sliding friction.

6. Normal force is supplied by the ____?____ of the surface.

7. The speed an object reaches when the force of gravity is balanced by the force of air resistance is called ____?____.

8. Earth has so much ____?____ that it hardly accelerates when you push against the ground while walking.

1.accerlate

2.Friction

1. An object will accelerate when the net force is not zero. To understand this, we can recall Newton's second law of motion, which states that the acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass. So, when the net force acting on an object is not zero, it will experience acceleration.

2. Brake will never speed up an object. This is because when you apply brakes, it creates a force that opposes the motion of the object, leading to a decrease in its velocity. Therefore, it is incorrect to say that braking will speed up an object.

3. The friction that prevents an object from moving when a force is applied is static friction. When an object is at rest, static friction acts between its surfaces, opposing the applied force and keeping the object stationary. This friction needs to be overcome by a larger applied force for the object to start moving.

4. The friction that slows down an object that slides is sliding friction. When an object is sliding on a surface, there is a resistance force acting against its motion, known as sliding friction. This friction opposes the motion of the object and gradually reduces its velocity.

5. A brake helps reduce sliding friction. When you apply brakes to a moving object, the brake pads exert a force on the wheels, increasing the sliding friction between the brake pads and the wheel surfaces. This increased friction helps to slow down the object by converting its kinetic energy into heat energy.

6. Normal force is supplied by the strength of the surface. The normal force is the force exerted by a surface to support the weight of an object placed on it. It acts perpendicular to the surface and is equal in magnitude and opposite in direction to the force of gravity acting on the object. The strength of the surface determines the magnitude of the normal force.

7. The speed an object reaches when the force of gravity is balanced by the force of air resistance is called terminal velocity. Terminal velocity is the maximum velocity an object can achieve during free fall or while moving through a fluid medium, such as air or water. At terminal velocity, the downward force of gravity is balanced by the upward force of air resistance, resulting in a constant velocity.

8. Earth has so much inertia that it hardly accelerates when you push against the ground while walking. Inertia is the tendency of an object to resist changes in its state of motion. Earth has a massive amount of inertia compared to our human bodies, so when we push against the ground to walk, the force we exert is relatively small compared to the Earth's inertia. As a result, Earth hardly accelerates due to our actions.