Forces and Motion

Grade 3 Science Worksheet - Challenge Me

Circle the answer.

1. 1.

   A box has 20 units of force pushing right and 12 units of friction pushing left. Which way does it move, and how much extra force is there?

   • right, with 8 extra units
   • left, with 8 extra units
   • it stays still
   • right, with 32 extra units
2. 2.

   A cart is still while two students push from opposite sides. Then one pushes harder. What happens?

   • the cart stays still
   • the cart moves sideways
   • the cart moves away from the harder push
   • the cart moves toward the harder push
3. 3.

   A ball rolls down a ramp. Use the graph of how far it has gone after each second. What does the pattern show?

   • the ball stops after 2 seconds
   • the ball slows down
   • the ball moves at the same speed
   • the ball speeds up as it rolls down
4. 4.

   A sled slides down a snowy hill onto flat ground. On which surface would it stop soonest?

   • it would stop the same on each
   • a patch of sand
   • smooth ice
   • packed snow
5. 5.

   A book sits on a table. Gravity pulls it down. Why doesn't it fall?

   • the table pushes up with an equal force
   • air holds the book up
   • the book has no weight on a table
   • gravity stops working on tables
6. 6.

   Team A and Team B each pull a rope with 60 units of force. A third child joins Team A and adds 10 units. What happens?

   • the forces stay balanced
   • the rope moves toward Team B
   • the rope moves toward Team A
   • the rope stays still
7. 7.

   A toy car rolls 50 cm on carpet and 200 cm on tile with the same push. What is the best explanation?

   • the car is heavier on carpet
   • tile has more friction than carpet
   • carpet has more friction than tile
   • gravity is stronger on carpet
8. 8.

   A student pushes a box with 10 units of force, and friction pushes back with 10 units. She wants the box to move. What should she do?

   • push with less than 10 units
   • push with exactly 10 units
   • push with more than 10 units
   • push from both sides at once
9. 9.

   A ball rolls back and forth in a bowl. It reaches 10 cm, then 8 cm, then 6 cm, then 4 cm up the side. Predict the next height.

   • 6 cm
   • 10 cm
   • 4 cm
   • 2 cm
10. 10.

    A kite stays still high in the sky. The wind pushes it and the string pulls it. What does this tell you?

    • the string pulls harder than the wind
    • gravity has stopped pulling the kite
    • the forces on the kite are balanced
    • only the wind is pushing the kite