P6 Forces

A man use a hammer to drive a nail into a piece of wood.

Which factor will not affect how deep the nail goes into the wood?

• Mass of the nail

• Mass of the man

• height of the hammer was raised

• friction between nail and wood

Based on Adrian's observation, which of the following conclusions can he make?

• Part Z of magnet 3 is a North Pole.

• The toy car is running on battery as it is moving non-stop.

• Magnet 2 is moving to and fro as it is attracted by magnet 1.

• Magnetic force of repulsion is causing the car to move non-stop between magnet 1 and 3.

How will the pointer move when only one of the batteries is used? Why?

• Movement of Pointer: Downwards

  Strength of Electromagnet: Decreased

• Movement of Pointer: Downwards

  Strength of Electromagnet: Increased

• Movement of Pointer: Upwards

  Strength of Electromagnet: Decreased

• Movement of Pointer: Upwards

  Strength of Electromagnet: Increased

Which of the following statements is/are correct?

A - Frictional force acted on the block when it was resting on the plank in Figure 1.

B - Frictional force acted on the block when the plank was being raised in Figure 2.

C - Frictional force acted on the block when ti was sliding down the plan in Figure 3.

• A only

• C only

• B and C only

• A, B and C

When Nigel turned on the switch, the metal ball moved towards the steel bar. Based on his observation, which of the forces are present?

• Magnetic and elastic spring force

• Frictional, magnetic and elastic spring force

• Magnetic, gravitational and elastic spring force

• Frictional, magnetic, gravitational and elastic spring force

Which of the following is the reason why the two blocks fell?

• The weight of R was greater than weight of Q.

• Friction between Q and P was less than the total weight of R and Q.

• Friction between P and L was less than the total weight of R, Q and P.

• The total weight of R and Q was greater than the total weight of Q and P.

Which of the following is correct?

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Which of the following statement(s) is/are correct?

A: John exerts a pulling force on the baseball at position E.

B: There is elastic spring force acting of the baseball at position E.

C: Frictional force act in the opposite direction of the movement of the baseball.

D: There is more gravitational force acting on the baseball at position F than position G.

• C only

• A and D only

• C and D only

• A, B, C and D

Based on the graph above, which of the following statements are correct?

A: Spring J extends longer than Spring K for the same mass hung.

B: The extension of both springs is the same for the same mass hung.

C: The original length of Spring J is longer than that of Spring K.

• A and B only

• A and C only

• B and C only

• A, B and C

As the rocket flies away from Earth and towards space, it needs less force to fly at a constant speed.

Which of the following statement(s) can explain the above observation?

A: The gravitational force is being converted to kinetic energy

B: The amount of the Earth's gravitational force acting on the rocket decreases

C: The amount of frictional force caused by the air acting on the rocket decreases

• A only

• A and B only

• A and C only

• B and C only