MCU Review Grade 8

1. Which of the following is NOT true?

• 1. Smoother surfaces offer high friction while rough surfaces offer less friction.

• 1. Contact force is the force that acts only when there is  physical contact between two objects. 

• 1. Force is a push or pull upon an object resulting from the object’s interaction with another object.

• 1. Non-contact force occurs due to either attraction or repulsion between two objects such that there is no contact between them.

The motion of the Moon around the Earth is an example of  ____.

• circular motion

• rectilinear motion

• projectile motion

• uniform action

Tags

NGSS.MS-ESS1-2

NGSS.MS-PS2-4

You swing a bucket of water attached to a string in a circle above your head. What

   keeps the water in the bucket?

• centrimeter force

• centripetal force

• centimeter force

• centifugal force

Tension force is described as ____.

• 1. force that occurs when an object has been pushed or pulled.

• 1. force exerted on an object when it comes in contact with air by traveling through it.

• 1. force that keeps objects in  place when they are resting on an object that is stable.

• 1. force that is transmitted through string, rope, cable, or wire when it is pulled tightly by the object on the opposite end.

Which of the following is TRUE about work in science?

• Work is an occupation.

• 1. Work is a task or tasks to be undertaken.

• 1. Work is an activity involving mental or physical effort in order to achieve a purpose or result.

• 1. Work is done when the force applied to the object causes the object to have displacement in the same direction as the force applied.

It is how fast the object moves

• Energy

• Joules

• Power

• Work

Tags

NGSS.MS-PS3-1

A weightlifter presses a 400N over his head in 2s. What is the power of the weightlifter?

• 100N

• 100J

• 400J

• 200J

The law of conservation of energy states that energy

• is always equal and opposite

• can be only created or destroyed

• can neither be created nor destroyed

• can either be created but not destroyed

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-2

NGSS.HS-PS3-4

Which of the following has the greatest potential energy?

• car parked at the top of the hill

• bowling ball falling a 10- storey building

• a car rolling down a hill

• a person standing at the top of the hill

Tags

NGSS.MS-PS3-2

If you increase _________ and __________ then you will increase the objects amount of potential energy.

• mass, speed

• mass, gravity

• mass, acceleration

• mass, height

Tags

NGSS.MS-PS2-4