A student measures the diameter of a pencil. Which measuring instrument will give the most precise reading?

• a measuring tape

• a metre rule

• a micrometer screw gauge

• a ruler

A light object is dropped from rest. It falls a large distance vertically through air. How can the motion of the object be described?

• constant acceleration

• increasing acceleration

• decreasing acceleration and then moving at terminal velocity

• increasing acceleration and then moving at terminal velocity

A car travels at an average speed of 60 km / h for 15 minutes.How far does the car travel in 15 minutes?

• 4.0 km

• 15 km

• 240 km

• 900 km

Which quantity is a force due to a gravitational field?

• density

• mass

• weight

• volume

The density of air is 1.2 kg / m³. A room has dimensions 5.0 m × 4.0 m × 3.0 m. What is the mass of the air in the room?

• 0.02 kg

• 0.10 kg

• 50 kg

• 72 kg

Which statement gives a complete description of any object that is in equilibrium?

• There are no forces acting.

• There is no resultant force.

• There is no resultant force and no resultant turning effect.

• There is no resultant turning effect

Two objects X and Y move directly towards each other. The objects have the same mass. Object X has a velocity of 5.0 m / s to the right. Object Y has a velocity of 3.0 m / s to the left.Object X and object Y collide and stick together.What is their velocity after colliding?

• 1.0 m / s to the left

• 1.0 m / s to the right

• 4.0 m / s to the left

• 4.0 m / s to the right

Brakes are used to slow down a moving car.

Into which form of energy is most of the kinetic energy converted as the car slows down?

• chemical

• elastic

• thermal

• sound

A man carries 20 tiles from the ground to the roof of a house. Each tile has a mass of 1.2 kg. The roof of the house is 15 m above the ground. How much work does the man do against gravity on the tiles in carrying them to the roof?

• 36 J

• 180 J

• 360 J

• 3600 J

A car is moving along a straight horizontal road. The car has 1.6 MJ of kinetic energy. The car accelerates for 20 s until the kinetic energy of the car increases to 2.5 MJ. What is the minimum average power developed by the car engine for this acceleration?

• 45 W

• 205 W

• 45 kW

• 205 kW