Force & Motion Quiz

Which of the following is an example of force causing an object to change direction?

1. A car speeds up while driving straight.
2. A train slows down but stays on a straight track.
3. A chair stays still on the floor.
4. A kite turns and moves with the wind

Answer: (d) A kite turns and moves with the wind

When you push a sled on snow, it moves more easily compared to pushing the same sled on grass. What do you think is happening here?

1. The sled becomes lighter when it is on snow.
2. Grass pulls the sled down with more gravity.
3. Snow reduces friction more than grass does.
4. The sled has wheels that work better on snow.

Answer: (c) Snow reduces friction more than grass does.

When you push a soft clay ball into a flat surface, which of the following describes the effect of your force?

1. The shape of the clay ball becomes smaller but its speed remains the same.
2. The clay ball speeds up and flies across the surface.
3. The force causes the clay ball to bounce back in the opposite direction.
4. The shape of the clay ball changes, flattening out as the force is applied.

Answer: (d) The shape of the clay ball changes, flattening out as the force is applied.

Which of these is a harmful effect of friction?

1. It helps a car’s tires grip the road.
2. It makes it harder to move objects.
3. It causes the soles of shoes to wear out.
4. It helps a bike slow down when braking.

Answer: (c) It causes the soles of shoes to wear out.

A book placed on a table does not move because:

1. Gravitational force cancels out friction.
2. The table applies an upward force balancing the book’s weight.
3. No forces act on the book.
4. The book’s weight is greater than the table’s resistance.

Answer: (b) The table applies an upward force balancing the book’s weight.

A student investigates the effect of different lubricants on reducing friction between two metal surfaces. The table below shows the time taken for a sliding block to stop after being pushed. Which conclusion is valid based on the experiment? Lubricant Time to Stop (seconds) No Lubricant 5 Oil 10 Grease 12

1. Oil and grease increase friction between surfaces.
2. Oil reduces friction more than grease.
3. Grease reduces friction more effectively than oil.
4. Friction remains constant regardless of lubrication.

Answer: (c) Grease reduces friction more effectively than oil.

You are pushing a heavy crate across a wooden floor, and it’s very hard to move. If you add a thin layer of water under the crate, how will the movement change?

1. It will become harder to push because water adds more friction
2. It will become easier to push because water reduces friction
3. The crate will stop moving completely
4. The crate will move the same way

Answer: (b) It will become easier to push because water reduces friction

A child is riding a bike on a flat road. The child pedals harder to speed up. Which of the following changes would make it harder for the child to continue pedalling at the same speed?

1. The road becomes steeper and the child is riding uphill
2. Keeping the bike well-lubricated
3. The tires are inflated to a higher pressure
4. The bike gets lighter

Answer: (a) The road becomes steeper and the child is riding uphill

A skateboarder is riding on a ramp. If they jump off the ramp and land on a soft, sandy beach, how will the force of landing on sand compare to landing on hard concrete?

1. The force from the sand will stop the skateboarder faster
2. The force from the sand will push the skateboarder up into the air
3. The force from the sand will make the skateboarder move faster
4. The force from the sand will have no effect on the skateboarder

Answer: (a) The force from the sand will stop the skateboarder faster

Emily conducted an experiment using three different objects of the same size: a wooden block, a rubber ball, and a plastic cup. She placed each object at the top of a ramp and let them slide down the ramp. She observed how far each object travelled after sliding off the ramp. Based on the experiment, which of the following statements is/are correct? A: The rubber ball travels the smallest distance. B: The frictional force acting on the wooden block is greater than the frictional force acting on the rubber ball. C: The plastic cup moves a shorter distance than the rubber ball because it is hollow.

1. A only
2. B only
3. A and C only
4. B and C only

Answer: (d) B and C only