《力和運動》強化訓練

河南固始信合外國語小學 孟雪瑩

I.What is the direction of this push? Choose the correct option.

( ) 1.A boy catches a fish.He uses his fishing pole to pull the fish out of the water.What is the direction of this push?

A.Away from the fishing pole.

B.Toward the fishing pole.

( ) 2.A girl accidently kicks over a pot of rice.Her foot pushes the pot,and the rice spills out.What is the direction of this push?

A.Away from the girl’s foot.

B.Toward the girl’s foot.

( ) 3.A hungry giraffe pulls a leaf to its mouth.What is the direction of this push?

A.Away from the giraffe.

B.Toward the giraffe.

( ) 4.A man pushes his team’s soapbox car with his hands.The car begins to roll forward.What is the direction of this push?

A.Away from the man’s hands.

B.Toward the man’s hands.

( ) 5.A builder pulls a bucket of supplies up to where he is working.What is the direction of this push?

A.Away from the builder’s body.

B.Toward the builder’s body.

( ) 6.A tennis player hits the ball with his racket.The racket pushes the ball over the net.What is the direction of this push?

A.Away from the tennis racket.

B.Toward the tennis racket.

( ) 7.A girl’s grandfather pushes her swing with his hands.The swing sways forward.What is the direction of this push?

A.Away from the grandfather’s hands.

B.Toward the grandfather’s hands.

( ) 8.A boy plays with marbles.He pushes one of the marbles with his thumb.What is the direction of this push?

A.Away from the boy’s thumb.

B.Toward the boy’s thumb.

( ) 9.A soccer player kicks the ball with his foot to score.His foot pushes the ball to the goal.What is the direction of this push?

A.Away from the soccer player’s foot.

B.Toward the soccer player’s foot.

( ) 10.A man flips a coin.He quickly pushes the coin into the air with his thumb.What is the direction of this push?

A.Away from the man’s thumb.

B.Toward the man’s thumb.

II.Choose the correct option.

( ) 1.A boy helps bring items from the store into the house.He applies a force to the items with his arms to slide the items out of the trunk.Which type of force from the boy slides the items out of the trunk?

A.push B.pull

( ) 2.A boy shops for food.He applies a force to a shopping cart to move it forward.Which type of force from the boy moves the cart forward?

A.push B.pull

( ) 3.An archer shoots an arrow.The bow string quickly pushes the arrow forward.Which type of force from the bow string pushes the arrow forward?

A.push B.pull

( ) 4.A girl’s dad pushes her bike with his hands,and she rides forward.Which type of force from the dad’s hands pushes the bike forward?

A.push B.pull

( ) 5.Two mail trucks are loaded with mail.The trucks are the same.But they are carrying different amounts of mail.The trucks begin to move at the same speed.Which truck needs a larger force to start moving?

A.The truck carrying 3,200 kg of mail.

B.The truck carrying 3,500 kg of mail.

( ) 6.A mom,a dad,and two kids are going for a walk.The mom and the dad each push one of the kids in a stroller.The strollers are the same.But the kids are different sizes.The mom and the dad push the strollers at the same speed.Which stroller is pushed with a larger force?

A.The stroller with a kid that weighs 22 kg.

B.The stroller with a kid that weighs 25 kg.

( ) 7.Two students get ready to leave school.The students have the same rolling backpacks.Each student has different books in their backpacks.The students start rolling their backpacks at the same speed.Which backpack is pulled with a larger force?

A.The backpack carrying 4.5 kg.

B.The backpack carrying 4 kg.

( ) 8.Compare the motion of two motorboats.Which motorboat was moving at a lower speed?

A.The motorboat that moves 450 km in 10 hours.

B.The motorboat that moves 450 km in 9 hours.

( ) 9.Compare the motion of two fish.Which fish was moving at a higher speed?

A.The fish that moved 20 km in 5 hours.

B.The fish that moved 18 km in 3 hours.

( ) 10.A shopper is buying food at the store.He fills two shopping bags.The shopping bags are the same size and shape.The shopper lifts each bag at the same speed.Which bag is lifted with a larger force?

A.The bag holding 5 kg of food.

B.The bag holding 7 kg of food.

(參考答案見本期第64 頁)

Keys toThe Golden Gate Bridge

I.1.which 2.didn’t agree 3.unique 4.not sure 5.decision

II.1.most 2.worried 3.taller 4.finally 5.importance

Keys toInteresting Calculations

(1) A=6;B=7;C=5 (2) 〇=8;□=12 (3) A=6;B=3 (4) △=12;□=10(5)〇=9;□=8 (6) △=9;〇=5 (7) A=7;B=2 (8) 〇=8;□=3 (9) A=3;

B=7 (10) A=16;B=8;C=2

Keys toSelf-assessment of Maths (1A)

I.(1) 12 (2) 12 (3) 17 (4) 19 (5) 20 (6) 12 (7) 3 (8) 2 (9) 3 (10) 5 (11) 6(12) 8

II.(1) 6 (2) 7 (3) 5 (4) 10 (5) 9 (6) 16

III.(1) 9 (2) 25 (3) 11 (4) 19