Effects Of Forces
A rubber band has an original length of 15.0 cm. When a force is applied, its length becomes 21.5 cm. What is the extension of the rubber band?
Three forces act along the same straight line on a block: 15 N to the right, 7 N to the left, and 4 N to the left. What is the resultant force on the block?
A car travels along a straight road at constant speed. The engine provides a forward force of 1500 N. Which statement correctly describes the friction forces acting on the car?
In a load–extension experiment, a student adds slotted masses to a spring and records the pointer position against a metre rule. Which precaution reduces parallax error when reading the ruler?
A skydiver jumps from an aircraft. Which sequence correctly describes the forces during the fall until terminal velocity is reached?
A spring has a spring constant of 250 N/m. Calculate the extension when a force of 15 N is applied.
Which statement correctly describes the effect of solid friction between two surfaces?
A resultant force of 4800 N acts on a car of mass 1200 kg. What is the acceleration of the car?
A swimmer moves through water at increasing speed. Which statement about the drag force acting on the swimmer is correct?
A spring is loaded with increasing masses and the extension is recorded. The load–extension graph is a straight line through the origin up to a load of 6.0 N, after which the graph curves. What does the point at 6.0 N represent?
A student places a book on a table. The book remains stationary. Which statement correctly explains why the book does not move?
A toy car of mass 0.50 kg accelerates from rest to 6.0 m s⁻¹ in 4.0 s. Calculate the resultant force acting on the car.
Which row correctly compares velocity and speed?
A spring extends by 0.040 m under a load of 8.0 N. The load is increased to 20.0 N and the spring remains within its limit of proportionality. What is the total extension at 20.0 N?
An object moves in a circular path at constant speed. A student claims the object is not accelerating because its speed is not changing. Which statement correctly evaluates this claim?
A resultant force of 600 N acts on a motorbike and rider of total mass 300 kg. The mass is then doubled to 600 kg while the resultant force remains at 600 N. What happens to the acceleration?
A metal block is dragged across a rough concrete surface. The temperature of both the block and the concrete increases. Which energy transfer explains this temperature rise?
A stone is attached to a string and swung in a horizontal circle at constant speed. The speed of the stone is then increased while the radius and mass remain constant. What happens to the force in the string?
A spring has a spring constant of 80 N/m. A student hangs a 2.4 N weight from the spring. The original length of the spring is 0.15 m. What is the new total length of the spring?
A delivery drone carries a package while flying horizontally at constant speed through air. Which pair of forces is balanced?