Types of Forces

Which of the following activities does not require any force?

• Writing a letter

• Folding a shirt

• Taking the dog out for a stroll

• Admiring a painting on the wall

Which of the following actions show(s) that friction is useful? (checkbox)

• To unscrew a bottle cap

• To push a wardrobe across the room

• To stop a moving car at a traffic junction

The diagram above shows a man throwing a javelin.

The javelin stays midair for a few seconds before landing on the ground. Which of the following statements about the moving javelin is true?

• No force is acting on the javelin when it is first thrown.

• The javelin travels at a constant speed throughout its motion.

• Gravitational force only acts on the javelin when it is at its highest point.

• Gravitational force is acting on the javelin throughout its motion.

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Alfonzo kicks a ball as shown above.

Which of the following statements correctly describe(s) the path taken by the ball? (checkbox)

• At X, frictional force is acting upwards.

• Alfonzo applied a pulling force onto the ball.

• There is no gravitational force acting on the ball at point Z.

• The force acting on the ball cause it to change its direction.

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April sets up an experiment as shown above.

When the metal ball is released at the top of the ramp, it hits the toy car and the car rolls to point Y. What can she do to ensure that the toy car rolls to point Z instead?

• Use a smaller metal ball

• Increase the height of the ramp

• Add some lubricant on the ramp

• Increase the thickness of the ramp

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The experiment above shows some iron nail stuck on the sides of a glass container. The rest of the iron nails remain at the bottom of the glass container.

Which of the following conclusions cannot be made from the above experiment? (checkbox)

• The iron nails are attracted by the magnetic force.

• The magnetic force can pass through the olive oil only.

• There is no magnetic force passing through the glass container.

• The glass beaker attracts the iron nails with its magnetic force.

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Austen tried to pull two different boxes filled with different items as shown above.

He had less difficulty pulling box J than box K. What could the possible reason(s) be? (checkbox)

• The wool is lighter the rice.

• More force is require to pull box K.

• There is more friction between bok J and the floor.

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A box fill with books was dragged across four different surfaces: timber flooring, marble flooring, carpet flooring, and cement flooring. The relationship between the force applied and the type of surface is shown in graph above.

Which one of the following identify the two different surfaces, carpet flooring : marble flooring?

• E : F

• F : E

• G : H

• H : G

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Four balls of the same mass are rolled on the floor at the same time. They are made from materials of different textures. The time taken for each ball to stop rolling is recorded in the table above.

Based on the table above, which ball has the roughest texture?

• Ball A

• Ball B

• Ball C

• Ball D

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The diagram above shows a man trying hard to keep his body straight while holding on to the handles of the excercise bar.

What kind of force(s) is the man experiencing? (checkbox)

• frictional force

• magnetic force

• gravitational force

• elastic spring force

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