Forces and motion

What is the SI unit for speed?

• m/s

• km/h

• m²/s

• m/s²

According to Newton's First Law of Motion, an object at rest will stay at rest unless:

• Its velocity increases

• Its velocity decreases

• A balanced force acts on it.

• An unbalanced force acts on it.

What is the acceleration of an object if the velocity changes from 0 m/s to 20 m/s in 5 seconds?

• 20 m/s²

• 5 m/s²

• 4 m/s²

• 25 m/s²

If an object is moving in a straight line at a constant speed, its acceleration is:

• Positive

• Zero

• Negative

• Constant

Which of the following is an example of Newton's First Law of Motion?

• A car accelerates when the gas pedal is pressed.

• A ball rolls across the floor and eventually stops due to friction.

• A rocket moves in space due to the force of gravity.

• An object moves faster when it is pushed harder.

If the net force acting on an object is zero, the object will:

• Accelerate in the direction of the applied force.

• Speed up.

• Change its state of motion.

• Remain at rest or continue moving with constant velocity.