Gravity is one of the most important forces in the universe. An object with mass in a gravitational field experiences a force known as weight.

What force is caused by gravity?

Mass

Weight

Downforce

What is the gravitational field strength of Earth?

9.8 N/kg

1.6 N/kg

25 N/kg

How is weight calculated?

Weight = mass × gravitational field strength

Weight = gravitational field strength ÷ mass

Weight = mass ÷ gravitational field strength

What is the weight of a 40 kg child on Earth (g = 9.8 N/kg)?

40 kg

4.1 N

392 N

How is the object shown in a free body diagram?

As a drawing of the object

As a written description of the object

As a box or a dot

In which way does an arrow point in a free body diagram?

Towards the object

Away from the object

In the direction of movement

What is a newton meter?

A unit for speed

A calibrated spring-balance

A unit for weight

Two 30 N forces act on an object in opposite directions. Which statement is correct?

The resultant force is: 30 + 30 = 60 N

The resultant force is: 30 - 30 = 0 N

The resultant force is: 2 × 30 = 60 N

How is work done calculated?

Work done = force × distance

Work done = distance ÷ force

Work done = force ÷ distance travelled

How much work is done when a ball is moved 1.5 m by a force of 12 N?

8 J

13.5 J

18 J