MS7A Revision Questions

Which statement about the masses and weights of objects on the Earth is correct?

• A balance can only be used to compare weights, not masses.

• Heavy objects always have more mass than light ones.

• Large objects always have more mass than small ones.

• Mass is a force but weight is not.

A stone has a weight of 5.7N. The gravitational field strength g is 10N/ kg.

What is the mass of the stone?

• 0.57 kg

• 5.7 kg

• 57 kg

• 570 kg

The block of metal shown has a mass of 240 g.

What is the density of the metal?

• 0.25 g/cm³

• 4.0 g/cm³

• 16 g/cm³

• 14400 g/cm³

A car engine causes a forward force of 100kN to act on the car. The total resistive force on the car is 20kN.

What is the resultant force on the car?

• 5.0 kN

• 60 kN

• 80 kN

• 120 kN

The diagram shows four solid objects resting on a horizontal surface.

The objects all have the same weight, and are drawn to the same scale.

Which object exerts the least pressure on the surface?

• 
• 
• 
• 

A student is weighed on laboratory scales.

Which row about weight and mass is correct?

• unit of weight - kg

  unit of mass - kg

• unit of weight - kg

  unit of mass - N

• unit of weight - N

  unit of mass - kg

• unit of weight - N

  unit of mass - N

A measuring cylinder containing only water is placed on an electronic balance. A small, irregularly shaped stone is now completely immersed in the water.

The diagrams show the equipment before and after the stone is immersed.

What is the density of the material of the stone?

• 1.7 g / cm³

• 3.3 g / cm³

• 4.5 g / cm³

• 8.7 g / cm³

A boat is travelling at a steady speed in a straight line across the surface of a lake.

Which statement about the boat is correct?

• The resultant force on the boat is in the direction of motion.

• The resultant force on the boat is in the opposite direction to its motion.

• The resultant force on the boat is vertically downwards.

• The resultant force on the boat is zero.

The diagram shows a box of dimensions 6.0 cm × 8.0 cm × 4.0 cm.

The box rests on a flat horizontal surface.

On which face must the box rest to exert the least pressure?

• face X

• face Y

• face Z

• The pressure is the same for all the faces.

Two identical fish tanks are filled to the same level with water. One tank contains fresh water. The other tank contains sea-water. Sea-water is more dense than fresh water.

Which fish experiences the greatest pressure?

• A

• B

• C

• D