Motion, Forces, & Energy Unit 2 Test

What is force?

• Something that makes work easier
• Gravity
• A push or a pull
• Inertia

Tags

NGSS.MS-PS2-1

What type of simple machine holds things together?

• pulley
• screw
• lever
• wedge

The pivoting point of a lever is called the what?

• Wedge
• Fulcrum
• Balance
• Center poing

What is one of the simple machines used in the picture to help move dirt from one place to another?

• Wheel
• Inclined Plane
• Screw
• Wedge

Tags

NGSS.MS-PS2-1

A person uses a lever to raise up a large rock until it is 2 meters from the ground. Which is the input force and which is the output force?

• The force applied to the rock is the input force, and the force applied by the person to the lever is the output force.

• The force applied by the person to the lever is the input force, and the force applied to the rock is the output force.

• The force applied to the fulcrum is the input force, and the force applied to the lever is the output force.

• The force applied to the rock is the input force, and the height of the rock is the output force.

A friend told you about a new pulley she used to lift some objects. She said, “The best part is it makes me do less work.” What should you say to your friend to help correct this statement?

• Nothing, the statement is already correct.

• Machines don’t make you do less work, they make you do more work.

• Machines don’t make you do less work, but they can change the way the work is done.

• Machines do make you do less work, and they also help you do it in a shorter amount of time.

A girl uses 60 J of energy to move a box from the floor to a shelf. If she uses 20 W of power to move the box, how many seconds did it take her to move the box?

• 2

• 3

• 30

• 120

Which of the following best defines energy?

• the ability to do work

• the resistance to motion

• how fast an object moves

• amount of force in a given time

Which of the following describes a transfer of energy through work?

• A student carries a heavy backpack one km.

• A laboratory burner is used to heat 250 mL of water to boiling.

• A woman pushes a luggage cart in an airport over a distance of 100 m.

• A man pushes on a large piece of furniture for 15 min, but it does not move.

Which of the following has kinetic energy?

• a book sitting on a shelf

• hat and gloves on a table

• a child kicking a soccer ball

• cars parked in a parking lot