Which statements are true?
A.
A screwdriver is a wheel & axle.
B.
A wheelbarrow is a kind of pulley.
C.
When a force is applied to a wheel, its axle exerts a greater force.
D.
A wheel & axle is like a screw.
E.
A pulley changes the direction of force.
B. A wheelbarrow is a kind of pulley.
E. A pulley changes the direction of force.
Statement B is true. A wheelbarrow is a kind of pulley.
To determine which statements are true, we will evaluate each statement individually.
A. "A screwdriver is a wheel & axle."
This statement is false. A screwdriver is not an example of a wheel and axle mechanism. A wheel and axle consists of a cylindrical wheel that rotates on an axle, allowing for the transmission of force. A screwdriver does not possess this configuration.
B. "A wheelbarrow is a kind of pulley."
This statement is false. A wheelbarrow is not a type of pulley. A wheelbarrow is a simple machine that utilizes a lever mechanism, not a pulley mechanism. A pulley consists of a grooved wheel with a rope or belt passing through the groove for lifting or moving objects.
C. "When a force is applied to a wheel, its axle exerts a greater force."
This statement is false. When a force is applied to a wheel, the axle does not exert a greater force. The force applied to the wheel and axle mechanism remains the same. The mechanical advantage of a wheel and axle is proportional to the ratio of the diameter or radius of the wheel to the diameter or radius of the axle.
D. "A wheel & axle is like a screw."
This statement is true. A wheel and axle can be compared to a screw in terms of their mechanical principles. Both the wheel and the screw involve rotational motion around an axis. They have threads or ridges that allow for the transmission of force by rotating.
E. "A pulley changes the direction of force."
This statement is true. A pulley is a simple machine that changes the direction of the force applied. It allows you to lift objects vertically by pulling downward or horizontally by pulling to the side, changing the direction of the force.