# NEXT 300 400 500 100 200 Forces Balanced/ Unbalanced Work, work, work… Ch 4 Vocab. This ‘n That 100 200 300 400 500 400 Team One Team Two.

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300 400 500 100 200 Forces Balanced/ Unbalanced Work, work, work… Ch 4 Vocab. This ‘n That 100 200 300 400 500 400 Team One Team Two Team Three Team Four Team Five Team Six

A push or pull that causes motion. Show Answer

force 100 Back to Board

The force of attraction between all objects. Show Answer

gravity 200 Back to Board

What kind of force opposes motion? Show Answer

friction 300 Back to Board

What kind of force is needed to keep your nametags on the side of your desks? Show Answer

Magnetic Force 400 Back to Board

Why does Mr. Heinz only weigh 35 pounds on the moon? Show Answer

The force of gravity is less on the moon. Bonus (100pts): Why is the force of gravity less on the moon than Earth? 500 Back to Board Because the moon is smaller than Earth.

One puppy pulls on a rope toy. His sister pulls on the other end with a balanced force. Does the rope toy move? Show Answer

NO! Balanced forces cancel each other out, and there is no movement. 100 Back to Board

A baseball is sitting on the top of a cone. Are the forces balanced or unbalanced? Show Answer

Balanced Bonus (100pts.) How can you make the forces unbalanced? 200 Back to Board Hit the ball!

Mr. Doofus and Mr. Do- right are arm wrestling. Mr. Doofus exerts a force of 20 N to the left. Mr. Do- right exerts a force of 30 N to the right. What is the net force? Show Answer

10 N to the right Mr. Do-right wins! 300 Back to Board

Why is it easer to lift a heavy weight that is under water, than on land? Show Answer

Buoyant forces push up on objects that are in water. 400 Back to Board

Use the words “buoyant force” to explain why a ping pong ball floats and a golf ball sinks? Show Answer

A ping pong ball floats because the buoyant force of water is greater than its weight. A golf ball sinks because the buoyant force of water is less than its weight. 500 Back to Board

A bar that makes it easier to move things. Show Answer

lever 100 Back to Board

True or False? Simple machines make less work. Why? Show Answer

False. Simple machines make work easier, not less work. 200 Back to Board

Which of the following demonstrates work being done? (list them on your board) Mr. Heinz pushing against a wall. Mr. Heinz hammering a nail through a board. Mr. Heinz riding his bike down the street. Mr. Heinz jumping on a trampoline. Mr. Heinz telling you to put your eyes on him. Mr. Heinz sitting on his stool. Mr. Heinz opening the door and walking out. Mr. Heinz reading science homework. Show Answer

300 Back to Board Which of the following demonstrates work being done? (put a √ next to any of them) Mr. Heinz pushing against a wall. Mr. Heinz hammering a nail through a board. Mr. Heinz riding his bike down the street. Mr. Heinz jumping on a trampoline. Mr. Heinz telling you to put your eyes on him. Mr. Heinz sitting on his stool. Mr. Heinz opening the door and walking out. Mr. Heinz reading science homework.

Match the name of the simple machine to its picture. Show Answer 1. Inclined Plane 2. Lever 3. Wedge 4. Pulley 5. Wheel and Axle ABCDEABCDE

400 Back to Board 1. Inclined Plane 2. Lever 3. Wedge 4. Pulley 5. Wheel and Axle Bonus (100pts): Which simple machine is actually 2 inclined planes put together? ABCDEABCDE

Which ones are compound machines? Show Answer 1 2 7 6 5 3 4

500 Back to Board

A device, made only of a few parts that makes work easier. Show Answer

Simple machine 100 Back to Board

A ramp or sloping surface. Show Answer

Inclined Plane 200 Back to Board

A wheel with a groove for a rope. Show Answer

pulley 300 Back to Board

A device made up of 2 or more simple machines. Show Answer

Compound Machine 400 Back to Board

The balance point of a lever. Show Answer

Fulcrum Bonus (100pts) Draw an arrow to the fulcrum on this wheel barrow. 500 Back to Board

What kind of force is acting on this compass? Show Answer

Magnetic forces 100 Back to Board

2 tow trucks pull on a bull- dozer toward the right with a force of 1000 N each. The bull-dozer pulls left with 1800 N. Are the forces balanced? Show Answer

NO! Bonus (100pts.) What is the net force and direction? 200 Back to Board 200 N to the right (the direction the tow trucks are pulling)

What type of simple machine is a door knob? Show Answer

Wheel and Axle 300 Back to Board

Which simple machine changes the direction of the force applied? Show Answer

A pulley You pull down on the rope, and the object goes up. 400 Back to Board

500 Back to Board

Show Question

Show Answer You want to move a large, heavy box of toys up into your treehouse that is very high. It’s too heavy and awkward to carry up the rope ladder. Which simple machine would help you move it up the best ? Why?

A pulley is the best because it can be put together easily. An inclined plane would work, but it’s too hard to put together. To End

End It Nice Job! STUDY HARD!

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