Effect of Forces

The diagram shows four objects, each with the same mass. Each object is acted on by the forces shown.

Which object will experience the largest acceleration to the left?

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A motorbike travels at a constant speed along a flat road. Three horizontal forces act on the motorbike. Two of them are shown in the diagram below.

• 2800 N forwards

• 1200 N forwards

• 1200 N forwards

• 2800 N forwards

An object with three forces acting on it is shown below.

What is the resultant force acting on the object?

• 90 N downwards

• 110 N upwards

• 200 N downwards

• 90 N upwards

Two students were discussing Newton's first and second laws of motion.

Which statement correctly summarizes these two laws?

• An object will not change its sped or direction unless a resultant force acts upon it equal to F = ma

• An object will not move unless a force acts upon it

• An object will speed up if a resultant force acts upon it equal to F = ma

• An object will only changes its direction if a force acts at right angle to it

A car slows down as it approaches a traffic light. The car was travelling at 13.5 m/s and it takes 22 s to come to a stop. The mass of the car is 950 kg. calculate the force required to stop the car.

• 583 N

• -583 N

• 618 N

• 1548 N