MORE ABOUT FORCES 2

This question is about a rollercoaster. This is the statement "A rollercoaster is able to climb up the hill because …". Complete the statement to the correct explanation.

• … friction in the dip increases its movement.

• … its movement gives it the energy to get to the top of the hill.

• … there is no friction.

• … there is no air resistance in the dip

Jamila has a toy with a spring. She makes the toy move upwards and downwards. Complete the sentence. When the toy bounces up, the upward force is …………..…………… than the downward force.

• smaller

• greater

Zahra has a toy with a spring. She makes the toy move upwards and downwards. What does Zahra do to make the toy bounce faster? Circle the correct answer.

• increase the weight of the toy

• push on the spring all of the time

• push on the spring less often

• push on the spring more often

• use a longer spring

Which picture show the correct direction of frictional force?

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Hasan and Husein roll marbles down a slope. They measure the distance the marbles roll along the floor. They change the angle of the slope and see how the distance changes. Tick () the two boxes that make this investigation a fair test.

• keep the angle of the slope the same

• repeat each test five times

• start the marble from the same place each time

• use the same marble

• wear safety spectacles

Ahmed is bouncing a toy animal on a spring. He investigates how the toy bounces up and down. Ahmed has some ideas. Which of the following ideas are true? Which statement is the correct idea?

• I can pull down on the toy hardly. If I let go then the toy will not bounce up very high.

• I think that the toy will stop bouncing. This is because of the force of friction.

Ahmed and Carlos investigate forces.

Ahmed and Carlos pull the rope.

They pull the rope with the same force.

Which direction will the material move?

Circle the correct answer.

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Complete the following sentences about friction. If friction acts on an object the speed of the object ....

• slower

• faster

• does not change

A ball is rolling in the direction of C. Where a force must be applied in order to make it move faster in the same direction?

• P

• Q

• R

• S

Burhan used the same amount of force to move his toy over four types of surfaces. He recorded the distance moved by his toy car in the table below as shown below. Arrange the four surfaces from the smoothest to the roughest.

• W, X, Y, Z

• X, W, Y, Z

• Y, Z, W, X

• X, W, Z, Y