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Force and Simple Machines Answer Key

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Vocabulary
#1 the push or pull of an object that causes it to move force
#2 an object that makes work easier simple machine
#3 a force that slows or stops movement between 2 surfaces friction
#4 a force that pulls an object towards another object gravity
#5 A v-shaped simple machine made up of 2 inclined planes wedge
Forces
#1 To move a heavier object, you must apply a _______ force greater force
#2 What force moves an object away? push
#3 Two boxes are pushed with the same amount of force. One is empty and the other has books in it. Which one will travel the farthest? the empty box
#4 What force brings an object close to you? pull
#5 Name 2 ways a force can change an object's movement? start moving, stop moving, change direction, change speed
Friction and Gravity
#1 What causes a box to move slower on carpet than on hardwood floors? friction
#2 Rivers flowing downhill is an example of what? gravity
#3 When you drop a ball, what is the force that pulls it towards the ground called? gravity
#4 Name a way to lessen the friction of a heavy box. add wheels, smooth surfaces, oil/wax, lighten it
#5 Which force makes it possible for you to walk? Think carefully!! friction AND gravity
Simple Machines
#1 Does a simple machine increase or decrease the amount of force needed to move an object? decrease
#2 Which simple machine is used to split or cut objects? wedge
#3 Simple machines increase the distance of a force and what else? changes the direction
#4 What is a compound machine? an object made of 2 or more simple machines
#5 Several simple machines can help you lift heavy object. What are they? lever, inclined plane, pulley
Name the Simple Machine
#1 Flagpole pulley
#2 crowbar lever
#3 knife wedge
#4 bottle cap screw
#5 doorknob wheel and axle
Final Question
Let's say you played cone ball in PE today. List the forces and examples of them that you used during the game. adkfj