Physics level 7 Quiz

What is the effect of balanced forces acting on an object?

• The object will accelerate.

• The object will remain at rest or move at a constant speed.

• The object will change direction.

• The object will increase in mass.

Which of the following is an example of an unbalanced force?

• A book resting on a table.

• A car accelerating on a highway.

• A satellite orbiting Earth at a constant speed.

• A person standing still.

What is the primary force acting on an object in free fall?

• Frictional force

• Gravitational force

• Magnetic force

• Tension force

Which simple machine consists of a wheel with a rope or chain wrapped around it?

• Lever

• Pulley

• Inclined plane

• Wedge

How does an inclined plane make work easier?

• By increasing the force needed

• By decreasing the distance over which the force is applied

• By changing the direction of the force

• By allowing a smaller force to be applied over a longer distance

What happens to the motion of an object if the net force acting on it is zero?

• The object will accelerate.

• The object will decelerate.

• The object will maintain its current state of motion.

• The object will change direction.

Which simple machine is used to hold objects together or lift them by converting rotational force into linear force?

• Lever

• Screw

• Wheel and axle

• Wedge

• 2 m/s²

• 5 m/s²

• 10 m/s²

• 20 m/s²

Which of the following is NOT a simple machine?

• Lever

• Pulley

• Spring

• Wheel and axle

What is the role of a wedge in a simple machine?

• To change the direction of a force

• To hold objects together

• To split or cut objects apart

• To increase the speed of an object