3rd grade forces and motion
3rd grade (Year 4 in England) · 16 questions · Common Core: NGSS.3-PS2-1, NGSS.MS-PS2-2, NGSS.3-PS2-2, NGSS.3-PS2-3 · England: KS2 Y3 Forces and magnets, KS2 Y5 Forces, KS3 Physics: Motion and forces (balanced forces)
Name
Date
Score/ 16
Question 1
A pendulum on a string takes 3 seconds to swing forward and back once. The pattern repeats. How many complete swings will it make in 21 seconds?
Answer
Question 2
True or false? Gravity is a non-contact force.
- A. True
- B. False
Question 3
A ball is dropped from 136 cm. It bounces to 68 cm, then 34 cm. Each bounce reaches half the height of the one before. How high will the next bounce be?
Answercm
Question 4
A toy car was rolled down the same ramp onto different surfaces. The chart shows how far it went (cm). Which surface had the MOST friction?
- A. carpet
- B. grass
- C. sandpaper
- D. ice
Question 5
A box is resting on smooth ice. It is pushed with 55 N to the left and 20 N to the right at the same time. What happens?
- A. moves to the left
- B. stays still
- C. moves to the right
Question 6
Two teams pull a rope equally hard. What happens to the rope?
- A. It moves towards the bigger team.
- B. It snaps at once.
- C. It stays where it is.
- D. It moves up into the air.
Question 7
Red team (pulling left): 60 N + 80 N + 70 N. Blue team (pulling right): 40 N + 100 N + 80 N. What happens?
- A. Red team wins (rope moves left)
- B. nobody wins (balanced)
- C. Blue team wins (rope moves right)
Question 8
Balanced forces: which statement is NOT true?
- A. Forces are measured in newtons (N).
- B. Forces are measured in kilograms.
- C. A book resting on a table has balanced forces acting on it.
- D. When forces are balanced, a moving object keeps moving at the same speed in the same direction.
Question 9
A seesaw goes up and down in a regular rhythm. If Sam's end is up now, where will it be after one more full up-and-down?
- A. up again
- B. in the middle for ever
- C. down
- D. it cannot be predicted
Question 10
What is friction?
- A. a force that acts against motion when surfaces rub together
- B. a force that pulls things down
- C. a force that only acts in water
- D. a kind of magnet
Question 11
A sledge is at rest. It is pulled with 50 N to the left and 100 N to the right. What happens?
- A. it stays still
- B. it starts to move right
- C. it starts to move left
Question 12
In a tug of war, the Red team's pullers pull with 120 N, 110 N. What is the Red team's total pull?
AnswerN
Question 13
Friction: which statement is NOT true?
- A. Friction acts in the opposite direction to movement.
- B. Friction can make surfaces warm up.
- C. Rough surfaces usually give more friction than smooth ones.
- D. Ice has more friction than sandpaper.
Question 14
A box is pushed with 55 N to the left and 85 N to the right. What is the size of the resultant force, in newtons?
AnswerN
Question 15
Red team pulls left with 100 N, 120 N, 80 N. Blue team pulls right with 90 N, 60 N, 100 N. What is the size of the resultant (overall) force?
AnswerN
Question 16
Three of these are examples of a non-contact force. Which one is NOT?
- A. Earth's gravity keeping the Moon in orbit
- B. a charged balloon lifting hair
- C. a magnet pulling a paperclip through paper
- D. a rope pulling a boat
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