force and weight

What are the correct units for force?

• joules

• newton

• watts

• m/s

Which of these is the correct formula linking force and acceleration?

• force = mass x acceleration

• acceleration = mass x force

• force = weight x acceleration

• acceleration = weight x force

What force is needed to make a 2kg firework rocket accelerate at 4 m/s²

• 0.2N

• 2N

• 4N

• 8N

Answer explanation

F=m*a

A 100g toy car uses an electric motor that produces a force of 3 N. What is the car's acceleration?

• 30 m/s²

• 300 m/s²

• 3 m/s²

• 0.3 m/s²

Answer explanation

F = m*a

When the astronaut Buzz Aldrin first stood on the Moon, he could feel a difference in the pull of gravity. Which statement is correct?

• He was weightless.

• His mass was now zero.

• His mass was the same but his weight was less.

• His weight was the same but his mass was less.

Answer explanation

weight depends on gravitaional pull , mass does not

Which of these statements give the correct description and unit for mass and weight?

• A

• B

• C

• D

Which of these is the correct formula linking mass and weight?

• weight = mass x gravitational field strength ( W = m.g )

• weight = mass ÷ gravitational field strength ( W= m/g)

• mass = gravitational field strength x weight ( m = g.W )

• mass = gravitational field strength ÷ weight ( m = g/W )