In science, what is the simplest definition of a "force"?, How fast an object moves, A push or a pull, Which of these is an example of a "pull"?, Hitting a baseball with a bat, Reeling in a fish on a fishing line, What is the invisible force that pulls all objects down toward the center of the Earth?, Friction, Gravity, What do we call the "total sum" of all forces acting on an object?, Net Force, Friction, If you want a heavy wagon to go very fast, what should you do?, Give it a small, gentle push, Give it a big, strong push, You are rolling a ball straight across the floor. If you push the side of the ball while it is moving, what will happen?, It will stop moving immediately, It will turn and change direction, Why does a bicycle eventually stop moving after you stop pedaling?, The bike runs out of "push", Friction between the tires and the road slows it down, Which surface would create the MOST friction for a toy car?, A smooth ice rink, A thick, shaggy carpet, Two students are playing tug-of-war. If the rope is NOT moving at all, what does this tell you?, The forces are balanced, The forces are unbalanced, A book is sitting still on a desk. Which statement is true about the forces acting on it?, Only gravity is pulling it down, The forces are balanced (the desk pushes up as much as gravity pulls down), If a Net Force on an object is NOT zero, what will the object do?, Stay perfectly still, Move, stop, or change direction, Imagine you are sliding on ice, and then you step onto sand. What happens to the "invisible force" of friction?, Friction stays the same, Friction increases, making you slow down or stop, A soccer player kicks a ball toward the goal. As the ball rolls through long grass, it slows down. Which force is responsible for slowing the ball?, The push from the player's foot, Friction between the ball and the grass, If a car is driving at a steady speed and the driver hits the brakes, the forces become unbalanced. In which direction does the new force act?, In the opposite direction of the motion, In the same direction the car is moving, A student wants to design a slide that makes kids go as fast as possible. Which material should they choose for the surface of the slide to reduce friction?, Rough, bumpy plastic, Smooth, polished metal, A heavy marble sits perfectly still in the middle of a rug., Balanced Force, Unbalanced Force, A leaf falls from a tree and speeds up as it hits the ground., Balanced Force, Unbalanced Force, Two students play tug-of-war, and the rope does not move at all., Balanced Force, Unbalanced Force, A toy car is pushed across the floor and slowly comes to a stop., Balanced Force, Unbalanced Force, An airplane flies at a steady speed in a straight line without slowing down., Balanced Force, Unbalanced Force, A soccer ball is kicked and begins to zoom across the grass., Balanced Force, Unbalanced Force, A framed picture hangs on a wall and does not move., Balanced Force, Unbalanced Force, A person sits on a chair, and the chair stays completely still., Balanced Force, Unbalanced Force, A skater is coasting, then pushes against the ground to go faster., Balanced Force, Unbalanced Force, Two puppies pull on a toy with equal strength in opposite directions., Balanced Force, Unbalanced Force, A ___________ is a push or a pull that makes an object move., Force, Motion, The force that pulls objects down toward the center of the Earth is called ___________., Gravity, Friction, When you use your hands to move a wagon away from you, you are using a ___________ force., Push, Pull, ___________ is a force that happens when two surfaces rub against each other., Friction, Gravity, If you want to move a heavy object, you need to apply a bigger ___________., Force, Motion, When an object changes its position over time, it is in ___________., Motion, Force, Rough surfaces, like sandpaper, create ___________ friction than smooth surfaces., More, Reduce, Using wheels on a cart helps to ___________ friction, making it easier to move., Reduce, More, Seesaw, Lever, Pulley, Jar lids, Screw, Wheel and axle, Flagpole, Pulley, Inclined plane, Ax (Axe), Wedge, Lever, Slide, Inclined plane, Pulley, Screwdriver, Wheel and axle, Wedge, Ramp, Inclined plane, Screw, Window blinds, Pulley, Lever, Wheels, Wheel and axle, Inclined plane, Scissor, Lever, Pulley, Which tool has two levers attached together for cutting paper?, Pulley, Scissors, Which simple machine is an inclined plane often found on a playground?, Slide, Doorknob, How many different types of simple machines are there?, Six, Three, Which simple machine is a wheel with a rope or chain?, Knife, Pulley, Which object is a wedge used for cutting food?, Slide, Knife, Which object is a wheel and axle device turned to open a door?, Doorknob, Scissors, What tall object uses pulleys to raise a flag?, Ramp, Flagpole.

Study Guide in Science

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