# Motor and driver net force

1. Feb 15, 2015

### SpiralStars

A motor and driver have a total mass of 300 kg . The driver starts moving from rest reaching an acceleration of 5 m / s2. The net force experienced by the motor of the motorcycle is

I'm not sure if i did this right cause they give 60 newtons as one of the answers.

I applied newton's second law and got 1500 newtons. But the ''net force experienced by the motor of the motorcycle'' keeps throwing me off.

2. Feb 15, 2015

### Staff: Mentor

Is this the full problem statement? In particular, is there a motor mass given or something else? If not, the answer looks strange.

3. Feb 15, 2015

### SpiralStars

I think I translated it wrong. These are in Spanish sorry.

''A driver and his motorcycle have a total mass of 300 kg . The driver starts moving from rest reaching an acceleration of 5 m / s2. The net force experienced by the motor of the motorcycle is? ''

A.1500 N
B. -1500 N
c -60 N
D. 60 N

4. Feb 15, 2015

### Staff: Mentor

Then 60 does not make sense.
It is a typical wrong answer in a multiple choice question, as you can get this number if you combine the two given numbers in the wrong way (300/5), but it is certainly not the right answer.
Maybe some mistake in the solution keys.

5. Feb 15, 2015

### rude man

6. Feb 15, 2015

### Staff: Mentor

Action: To maintain this acceleration, the propelling force delivered to the bike + rider is 1500N. Reaction: The driving tyre sees this load component as -1500N.

Perhaps that is the intended answer (B)?