Force - mix forces and energies

A magnetic material remained stationary on a wooden slope as shown.

Which force(s) acted on the magnetic material?

• Frictional force and gravitational force only.

• Frictional force and magnetic force only.

• Gravitational force only.

• Frictional force, magnetic force and gravitational force .

A magnetic material was sliding down the wooden slope as shown.

Which force(s) acted on the magnetic material?

• Frictional force and gravitational force only.

• Frictional force and magnetic force only.

• Magnetic force and gravitational force only.

• Frictional force, magnetic force and gravitational force .

A magnetic material was placed near a magnet along the wooden slope. The magnetic material remained stationary along the slope.

Which force(s) acted on the magnetic material?

• Frictional force and gravitational force only.

• Frictional force and magnetic force only.

• Magnetic force and gravitational force only.

• Frictional force, magnetic force and gravitational force .

A piece of paper was held on the fridge door by a fridge magnet as shown.

Which force(s) acted on the paper?

• Frictional force and gravitational force only.

• Frictional force and magnetic force only.

• Magnetic force and gravitational force only.

• Frictional force, magnetic force and gravitational force .

The diagram showed an iron bar was pulled further downwards by a magnet.

What were the forces acting on the iron bar?

• Elastic spring force and gravitational force only.

• Elastic spring force, frictional force and magnetic force only.

• Elastic spring force, magnetic force and gravitational force only.

• Frictional force, magnetic force and gravitational force .

The diagram showed a magnet was pulled along the brick surface by a plastic spring.

What were the forces acting on the magnet?

• Elastic spring force, magnetic force and gravitational force only.

• Elastic spring force, frictional force and magnetic force only.

• Frictional force, magnetic force and gravitational force only.

• Frictional force, elastic spring force and gravitational force .

The diagram showed a magnet was pulled along the a slanted surface by a spring. The slope was made from steel.

What were the forces acting on the magnet?

• Elastic spring force, magnetic force and gravitational force only.

• Elastic spring force, frictional force and gravitational force only.

• Elastic spring force, magnetic force and frictional force only.

• Frictional force, elastic spring force, magnetic force and gravitational force .

A roller coaster car traveled from point A to D.

Which of the following statements about the roller coaster train is correct?

• Its gravitational force at A and D is the same.

• Its kinetic energy at B is zero.

• Its gravitational force at B is zero.

• Its gravitational potential energy at C is higher than at A.

A box was given a kick at position S.

The box eventually stopped along the slope at position T.

Which of the following statements is correct?

• The box stop at T because it lost all its energy.

• The box stop at T because there was no force acting on it.

• All the kinetic energy at S is converted to potential energy at T.

• The frictional force acting on the box acted against the gravitational force acting on the box to hold the box at position T.

A red ball and a blue ball were both released from point A. Both balls had the same mass. The blue ball traveled further than the red ball.

Which of the following is a possible reason?

• The blue ball had a higher potential energy than the red ball at point A.

• The blue ball had a high gravitational force than the red ball at point A.

• The blue ball and the red ball had different surface texture.

• The gravitational force acting on the blue ball on the slope and at the level ground is the same.