Measurement, Motion & Mass vs Weight

A metre rule is used to measure a length. Which reading is shown to the nearest millimetre?

• 0.7 m

• 0.76 m

• 0.761 m

• 0.7614 m

Answer explanation

The correct reading to the nearest millimetre is 0.761 m, as it provides three decimal places, which is necessary for millimetre precision. The other options either round too early or do not meet the required precision.

The graph represents the movement of a body. How far has the body moved after 5 s?

• 2 m

• 10 m

• 25 m

• 50 m

Answer explanation

The graph shows the distance covered by the body over time. At 5 seconds, the graph indicates a total movement of 25 m, making this the correct answer.

A car travels 100 km. The highest speed of the car is 90 km/h, and the lowest speed is 30 km/h. The journey takes two hours. What is the average speed for the journey?

• 30 km/h

• 50 km/h

• 60 km/h

• 90 km/h

Answer explanation

To find the average speed, divide the total distance by the total time. The car travels 100 km in 2 hours, so the average speed is 100 km / 2 h = 50 km/h. Thus, the correct answer is 50 km/h.

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.

Answer explanation

The correct statement is that heavy objects always have more mass than light ones. Mass is a measure of the amount of matter in an object, while weight is the force exerted by gravity on that mass.

The table shows the weight in newtons of a 10 kg mass on each of four planets. The diagram shows a force meter (spring balance) being used. On which planet is the force meter (spring balance) being used?

• Earth

• Jupiter

• Mercury

• Venus

Answer explanation

The weight of a 10 kg mass is highest on Earth due to its gravitational pull. The force meter (spring balance) would show the weight corresponding to Earth's gravity, making Earth the correct choice.

Which items of apparatus are required to determine the density of a liquid?

• balance and measuring cylinder

• balance and thermometer

• metre rule and measuring cylinder

• metre rule and thermometer

Answer explanation

To determine the density of a liquid, you need a balance to measure mass and a measuring cylinder to measure volume. The correct choice is 'balance and measuring cylinder'.

The diagram shows an enlarged drawing of the end of a metre rule. It is being used to measure the length of a small feather.

What is the length of the feather?

• 19 mm

• 29 mm

• 19 cm

• 29 cm

Answer explanation

The feather measures 19 mm on the metre rule, as indicated by the markings. The other options in cm are incorrect conversions, making 19 mm the accurate length.

Which statement about mass and weight is correct?

• Mass and weight are both forces.

• Neither mass nor weight is a force.

• Only mass is a force.

• Only weight is a force.

Answer explanation

Weight is the force exerted by gravity on an object, while mass is a measure of the amount of matter in an object. Therefore, only weight is classified as a force.

An object moves initially with constant speed and then with constant acceleration.

Which graph shows this motion?

• B

• C

• A

• D

Answer explanation

Graph B correctly represents the motion: it shows a constant speed initially (horizontal line) followed by a curve indicating constant acceleration. This matches the described motion of starting with constant speed and then accelerating.

Five athletes P, Q, R, S and T compete in a race. The table shows the finishing times for the athletes.

Which statement is correct?

• Athlete P won the race and was 0.70 s ahead of the athlete in second place.

• Athlete P won the race and was 1.90 s ahead of the athlete in second place.

• Athlete S won the race and was 1.30 s ahead of the athlete in second place.

• Athlete S won the race and was 2.10 s ahead of the athlete in second place.

Answer explanation

Athlete P had the fastest time, winning the race. The difference between P's time and the second-place athlete's time was 0.70 seconds, confirming the first statement as correct.