Forces

What is the formula for force?

• F= m / a

• F= a / m

• F= m x a

• F= m x F

F = ma

If a 10 kilogram object accelerates suddenly at 15 ms^-2, how much force was applied to the object?

• 150 Newtons

• 15 Newtons

• 150 kilograms

• 100 kilograms

45 ms^-1 is an example of ....

• Mass

• Force

• Acceleration

• Speed

If a force of 26 N is exerted on two balls, one with a mass of 0.52 kg and the other with a mass of 0.78 kg, which ball will have the greater acceleration? (F=ma)

• The one with a mass of 0.78 kg will have the greatest acceleration.

• The one with a mass of 0.52 kg will have the greatest acceleration.

• They will both accelerate at the same rate.

Unit of mass

• m/s 2
• m/s
• newtons
• kg

What can a force do?

• all of the above
• start a motion
• stop a motion
• change the direction of the motion

What is the acceleration of a 50 kg object pushed with a force of 500 newtons? To solve this problem you must do -

• 500 ÷ 50

• 50 ÷ 500

• 500 x 50

What is the acceleration of a 50 kg object pushed with a force of 500 newtons? The answer to this question is most likely (HINT: Look at the units!!!) -

• 10 N

• 10 ms^-2

• 10 kg

A 50 kg skater pushed by a friend accelerates 5 ms^-2. How much force did the friend apply? To solve this problem you must do -

• 50 ÷ 5

• 5 ÷ 50

• 50 x 5

The mass of a car is 1000 kg. How much force would be required to accelerate the car at a rate of 3 ms^-2?

• 1000 ÷ 3

• 3 ÷ 1000

• 1000 x 3