MG 2.2

MG 2.2

Newton's 2nd Law of Motion

Multiple Choice

How much force is needed to accelerate a 66 kg skier at 2 m/sec2?

• 125 N

• 156 N

• 80 N

• 132 N

The answer is 132 N

Force is the product of the mass and acceleration of an object. To find force, you multiply mass and acceleration.

Multiple Choice

What is the force on a 1000 kg elevator that is falling freely at 9.8 m/sec2?

• 9800 N

• 1200 N

• 3500 N

• 8700 N

The answer is 9800 N

To find the force, multiply mass and acceleration

Multiple Choice

What is the acceleration of a 50 kg object pushed with a force of 500 newtons?

• 25 m/s^2

• 10 m/s^2

• 36 m/s^2

• 40 m/s^2

The answer is 10 m/s^2

to find acceleration, divide the force and the mass of an object.

Multiple Choice

A 50 kg skater pushed by a friend accelerates 5 m/sec2. How much force did the friend apply?

• 360 N

• 240 N

• 375 N

• 250 N

The answer is 250 N

To find the force, multiply mass and acceleration.

Multiple Choice

A force of 250 N is applied to an object that accelerates at a rate of 5 m/sec2. What is the mass of the object?

• 25 kg

• 75 kg

• 40 kg

• 50 kg

The answer is 50 kg

To find mass, divide force and acceleration

Multiple Choice

If a 60 kg person on a 15 kg sled is pushed with a force of 300 N, what will be person’s

acceleration?

• 4 m/s^2

• 5 m/s^2

• .2 m/s^2

• 20 m/s^2

The answer is 4 m/s^2

Since there is a 60 kg person on a 15 kg sled, you add those numbers together to get the total mass. Then divide the force by the mass to find acceleration.

Multiple Choice

An object of mass 300 kg is observed to accelerate at the rate of 4 m/s2. Calculate the force required to produce this acceleration.

• 1400 N

• 1600 N

• 1200 N

• 1300 N

The answer is 1200 N

To find force, multiply mass and acceleration

Multiple Choice

A force of 20 N acts upon a 5 kg block. Calculate the acceleration of the object.

• .25 m/s^2

• .50 m/s^2

• 40 m/s^2

• 4 m/s^2

The answer is 4 m/s^2

To find acceleration, divide force by mass

Multiple Choice

If given the same force by the person, would the car or the lawn mower have more acceleration?

• car

• lawn mower

The lawn mower would have more acceleration

Since the lawn mower is less massive than the car, it would have more acceleration.