M2.2 Forces

What equation links distance, speed and time?

• speed = time ÷ distance

• speed = distance ÷ time

• speed = distance x time

• speed = time x distance

Which of the following is a unit for acceleration?

• km/s
• m/s²
• mi/hr
• ft

Of the following, which is a vector?

• Mass
• Time
• Speed
• Velocity

What is the equation that links acceleration, change in velocity and time?

• acceleration = change in velocity x time

• acceleration = change in velocity ÷ time

• acceleration = time ÷ change in velocity

Acceleration is defined as the "change in..."

• the time it takes to move from one place to another.

• velocity of an object.

• distance, divided by the time taken.

• velocity, divided by the time taken.

A golf ball accelerates off a tee at 15m/s², changing its velocity from 0m/s to 50 m/s down the fairway. How long did it take the golf ball to accelerate?

• 750 seconds
• 35 seconds
• 0.3 seconds
• 3.3 seconds

A spring has a spring constant of 5 N/cm. What is its extension when loaded with 15 N?

• 3 cm

• 5 cm

• 3 m

• 5 m

What is the equation that links distance, time and velocity?

• velocity = time x distance

• velocity = distance ÷ time

• velocity = time ÷ distance

What is the resultant force in this diagram?

• 17 N, right

• 17 N, left

• 23 N, right

• 12 N, up

Calculate the average speed (in m/s) if a cheetah runs 180 metres in 10 seconds.

• 198 m/s

• 170 m/s

• 12 m/s

• 18 m/s