WorksheetsReview on Dynamics
Total questions: 16
Worksheet time: 8mins
A block on a table is pulled by a horizontal string. Which diagram correctly represents all forces?
A. A. Tension only
B. Tension and normal
C. Tension, normal, gravity
D. Tension, normal, friction, gravity
Two forces act on a point in opposite directions. Which statement is true when the object is in equilibrium?
A. Forces differ
B. Forces are equal and opposite
C. Acceleration is not zero
D. Velocity is constant but direction changes
A person pushes a wall with 50 N. The wall pushes back with:
A. 0 N
B. 25 N
C. 50 N
D. Depends on the wall’s mass
In a collision between a truck and a car, which statement is true?
A. Truck exerts greater force
B. Car exerts greater force
C. Both exert equal forces
D. Force depends on speed only
A skater pushes another skater. Which moves faster and why?
A. Both equally
B. Lighter one, smaller mass
C. Heavier one, larger force
D. Both remain at rest
An object continues moving at constant speed in a straight line unless acted on by:
A. Gravity
B. Balanced force
C. Unbalanced force
D. Frictionless surface
For every action force, there must be a reaction force that _______.
A. is slightly smaller in magnitude than in action force.
B. acts in the same direction
C. is slightly larger in magnitude than the action force
D. is equal in magnitude.
If a hockey puck slides on frictionless ice, what happens to its velocity?
A. Increases
B. Decreases
C. Stays constant
D. Changes direction randomly
A 2 kg block accelerates at 3 m/s². What is the net force?
A. 0 N
B. 1.5 N
C. 6 N
D. 9.8 N
You push on a large, heavy box, but it doesn't move. According to Newton's Third Law, what is the reaction force to your push?
A. The weight of the box acting downwards.
B. The normal force exerted by the floor on the box.
C. The static friction force exerted by the floor on the box.
D. The force exerted by the box back on you.
If net force on an object is doubled while mass stays constant, acceleration…
A. Doubles
B. Halves
C. Stays same
D. Becomes zero
If the distance between two objects doubles, the gravitational force becomes:
A. Four times
B. Twice
C. Half
D. One-fourth
Which reasoning supports the claim that gravitational force is always attractive?
A. Gravity acts only upward
B. It depends on motion direction
C. Masses always produce attraction
D. Distance cancels repulsion
Two asteroids of mass M are in deep space far away from any other objects. The centers of the asteroids are a distance d apart where d is much larger than the size of the asteroids, and each asteroid exerts a force of magnitude F on the other. At a later time, the mass of each asteroid has increased to 2M and they are a distance d/2 apart. What is the magnitude of the force that each asteroid exerts on the other at this later time?
A. 16F
B. 8F
C. 4F
D. F
A hammer drives a nail into a piece of wood that is at rest. At the instant shown, the hammer is in contact with the nail and the nail is accelerating downward. Which of the following claims correctly compares the magnitudes of the forces between the hammer, nail, and wood at this instant?
A. The magnitude of the force that the hammer exerts on the nail is equal to the magnitude of the force that the nail exerts on the hammer.
B. The magnitude of the force that the wood exerts on the nail is equal to the magnitude of the force that the hammer exerts on the nail.
C. The magnitude of the force that the hammer exerts on the nail is equal to the magnitude of the force that the nail exerts on the wood.
D. The magnitude of the force that the nail exerts on the hammer is equal to the force that the wood exerts on the nail.
The free-body diagram shows the three forces exerted on an object. Each square in the grid is 1 N by 1 N. What is the magnitude of the vector sum of the forces exerted on the object?
A. 0 N
B. 2 N
C. 6 N
D. 7.7 N
