Grade 3 science quiz on forces and simple devices

📚 Quick Study Guide

• 🍎 Force: A push or pull that can change the motion of an object.
• 🚗 Motion: A change in the position of an object.
• ⬆️ Push: Moving something away from you.
• ⬇️ Pull: Moving something towards you.
• ⚙️ Simple Machines: Tools that make work easier by changing the size or direction of the force.
• 🧱 Lever: A rigid bar that pivots on a fixed point called a fulcrum (e.g., seesaw).
• ⬆️ Inclined Plane: A sloping surface (e.g., ramp).
• 🔩 Screw: An inclined plane wrapped around a cylinder.
• 🧵 Wedge: A double inclined plane that moves to exert a force (e.g., axe).
• 🔄 Wheel and Axle: A wheel attached to a rod, allowing the wheel and axle to turn together (e.g., steering wheel).
• ⛓️ Pulley: A wheel with a grooved rim around which a rope passes (e.g., flag pole).

🧪 Practice Quiz

1. Which of the following is an example of a force?
   1. A. A stationary rock
   2. B. A rolling ball
   3. C. A gentle breeze pushing a leaf
   4. D. A shadow on the ground
2. What simple machine is used to raise a flag up a flagpole?
   1. A. Lever
   2. B. Inclined Plane
   3. C. Pulley
   4. D. Wheel and Axle
3. Which of these is an example of an inclined plane?
   1. A. A seesaw
   2. B. A staircase
   3. C. A doorknob
   4. D. A bicycle wheel
4. What does a lever use to help lift heavy objects?
   1. A. A rope
   2. B. A fulcrum
   3. C. A wheel
   4. D. A screw
5. Which simple machine is a winding inclined plane?
   1. A. Wheel and Axle
   2. B. Screw
   3. C. Wedge
   4. D. Pulley
6. What happens when you apply a force to an object?
   1. A. It always moves faster.
   2. B. It always stops moving.
   3. C. It can change its motion.
   4. D. Nothing happens.
7. Which of the following is an example of a 'pull' force?
   1. A. Kicking a ball
   2. B. Closing a door
   3. C. Lifting a book
   4. D. Blowing air